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Engineering A APB TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A1 A E N G I N E E R I N G A A ENGINEERING Bearing Types and Cages A4 Determination of Applied Loads and Bearing Analysis A21 Bearing Reactions Dynamic Equivalent Loads and Bearing Life A27 Bearing Tolerances Inch and Metric A43 Mounting Designs A73 Fitting Practice A102 Bearing Setting A140 Lubrication and Seals A146 Speed Heat and Torque A163 Conversion Tables A174 A E N G IN EERING AA A2 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A3 Engineering A A Bearing selection is a process for evaluating the suitability of bearings for specific industrial applications The quality of the information available to make these selections will play a major role in determining the success of the bearing choice The first step in bearing selection is identifying the proper roller element type whether it is a ball needle cylindrical spherical or tapered roller bearing Each roller bearing type has advantages and disadvantages that are specific to each design and will affect such things as the loads and speeds that the bearing can sustain in the application Next assess the size constraints of the bearing envelope or available space This is done by considering the minimum shaft diameter maximum housing bore and available width within the application for the bearing After the bearing envelope is defined search the catalog for bearings with bores outer diameters and widths that will fit within the bearing envelope There may be several bearings with different load carrying capacities available that fit within the envelope INTRODUCTION Timken is a leader in the advancement of bearing technology Expert craftsmanship well equipped production facilities and a continuing investment in technology programs ensure that our products are synonymous with quality and reliability Today our plants manufacture thousands of bearing types and sizes to handle a wide range of application requirements Anti friction bearings inherently manage broad ranges of speed and many combinations of radial and thrust loads Other important environmental conditions such as low and high temperature dust and dirt moisture and unusual mounting conditions affect bearing operation This engineering section is not intended to be comprehensive but does serve as a useful guideline in bearing selection Where more complex bearing applications are involved your Timken representative should be consulted The following topics are covered within this section Bearing types Cages Internal clearances Tolerances Shaft and housing fits and shoulders Load ratings and life calculations Lubrication Materials Limiting speeds Duplex bearings and preloading Determine which of these bearings will give the desired life in the application by performing a bearing life analysis for each bearing The following sections in this catalog give a detailed explanation of how to perform bearing life analysis Once you have chosen the right bearing to handle the load requirements of your application and the design options are chosen the bearing selection is completed These options include such features as cage type cylindrical roller bearing flange arrangements radial internal clearance or setting precision level and lubrication These options are selected based on the application s speed temperature mounting and loading conditions and will enable you to achieve optimum bearing performance and life For a closer look your Timken representative can provide you with expert computer analysis to give you the most detailed information for your bearing application BEARING SELECTION PROCESS Tapered Roller Thrust Tapered Cylindrical Roller Thrust Cylindrical Spherical Roller Thrust Spherical Thrust Ball Needle Roller Thrust Needle Characteristic Bearing Roller Bearing Bearing Roller Bearing Bearing Roller Bearing Ball Bearing Bearing Bearing Roller Bearing Pure Radial Load Excellent Unsuitable Excellent Unsuitable Excellent Unsuitable Good Poor Excellent Unsuitable Pure Axial Load Good Excellent Unsuitable Good Fair Excellent Fair Excellent Unsuitable Excellent Combined Load Excellent Fair Fair Unsuitable Excellent Fair Good Poor Unsuitable Unsuitable Moment Load Fair Poor Unsuitable Unsuitable Unsuitable Unsuitable Good Poor Fair Unsuitable High Stiffness Excellent Excellent Good Excellent Good Good Fair Good Good Excellent Quiet Running Fair Fair Good Poor Fair Poor Excellent Good Good Fair Low Friction Fair Fair Good Poor Fair Fair Excellent Excellent Good Good Misalignment Poor Poor Poor Unsuitable Excellent Excellent Good Poor Poor Poor Locating Position Excellent Good Fair Fair Good Good Good Excellent Unsuitable Excellent Fixed Non Locating Good Unsuitable Excellent Unsuitable Fair Unsuitable Good Unsuitable Good Unsuitable Position Floating Speed Good Good Good Poor Fair Fair Excellent Excellent Good Poor A2 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A3 Engineering A A4 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A5 A4 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A5 Suffix K Suffix W Fixed Mounting Floating Mounting Bearing Types and cages Bearing types RADIAL BALL BEARINGS The basic types of Timken ball bearings are shown here They are the non filling slot or Conrad which is identified by the suffix K and the filling slot designated by the suffix W The non filling slot or Conrad bearing has uninterrupted raceway shoulders and is capable of supporting radial thrust or combined loads The filling slot type which is assembled with more balls than a K Type of the same size has a greater capacity than the K Type but has limited thrust capacity due to the filling slots in the raceway shoulders Both K and W can be mounted with or without locknuts and either fixed or floating in their housings as illustrated here Fixed Mounting Floating Mounting Typical Mountings for Double Row Angular contact Ball Bearings Double Row Type Double row angular contact ball bearings are used effectively where heavy radial thrust or combined loads demand axial rigidity of the shaft This type is similar to a duplex pair of single row bearings by virtue of its two rows of balls and angular contact construction which provide greater axial and radial rigidity than can be obtained by using a single row radial bearing With the exception of small sizes double row ball bearings are made in the filling slot construction and therefore do not have as much thrust capacity as equivalent size single row angular contact bearings mounted in duplex pairs Fixed and floating mountings of double row bearings are shown Smaller sizes are supplied with polymeric retainers ANGULAR CONTACT BALL BEARINGS Single Row Type Single row angular contact ball bearings are designed for combination loading with high thrust capacity in one direction and are suggested for applications where the magnitude of the thrust component is high enough to preclude the use of radial type ball bearings They are dimensionally interchangeable with single row radial bearings of corresponding sizes The angular contact ball bearing has a relatively large contact angle high race depths and a maximum complement of balls assembled through a counterbore in the outer ring These features provide bearings with significantly more thrust capacity than radial bearings of the same size Angular contact bearings are used in such applications as gear reducers pumps worm drives vertical shafts and machine tool spindles where they are frequently mounted in various duplex arrangements as described in the duplex section Single Row A4 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A5 Engineering A A4 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A5 snap ring provides an adequate shoulder for the bearings without a sacrifice in bearing capacity The thrust capacity of the snap ring in shear is considerably above the thrust capacity of the bearing Typical designs illustrating how mounting simplification can be accomplished through the use of snap ring bearings are shown below BALL BEARINGS WITH SNAP RINGS WIRELOC Single row radial bearings including those with seals or shields and open and shielded double row types are available with snap rings which provide a shoulder integral with the bearing designed for mounting in through bored housings This feature is designated by adding the suffix G to the standard bearing number Single shielded or sealed bearings with snap rings can be supplied with the snap ring on the same side or that opposite the shield or seal position These bearings are advantageous in automobile transmission design and in all applications where compactness is essential or where it is difficult and costly to machine housing shoulders The Typical Mounting For Snap Ring Bearing Typical Application For Super Precision Bearing SUPER PRECISION BALL BEARINGS Every Timken Fafnir ball bearing manufactured is made to precision tolerances The standard tolerances established by the Annular Bearing Engineers Committee ABEC are adhered to and even the most liberal classification ABEC 1 ensures a precision product by nature Many applications in numerous types of machinery can be satisfactorily operated with ABEC 1 tolerance bearings However for applications involving high speeds extreme accuracy and rigidity in such equipment as high grade machine tools woodworking machines gas turbines and sensitive precision instruments a complete line of Timken Fafnir super precision ball bearings is manufactured to ABEC 7 and ABEC 9 tolerances Bearing Types and cages continued Engineering A A6 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A7 A6 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A7 Setscrew Series Bearings The GYA RRB and the GY KRRB series relubricatable and non relubricatable bearings are extended inner ring and wide inner ring type bearings with specially designed setscrews to lock on shafting Positive contact land riding R Seals provide protection against harmful contaminants and retain lubricant Extended inner ring bearings are used when space is at a premium and overturning loads are not a problem The new wide inner ring setscrew series is available when additional surface contact on the shaft is a requirement for added stability BALL BEARINGS WITH LOCKING DEVICES By virtue of their independent locking devices these bearings are suitable for mounting on straight shafting no shoulders etc They are often supplied with spherical outer rings for self alignment at mounting Mounted alignment is usually required because these bearings are generally assembled into pillow blocks or flanged cartridges or other housings bolted to pedestals or frames independent of each other Self Locking Eccentric Collar Timken invented the eccentric self locking collar to facilitate mounting of wide inner ring bearings The self locking collar eliminates the need for locknuts lockwashers shoulders sleeves and adapters The locking collar has a counterbored recess eccentric with the collar bore This eccentric recess engages or mates with an eccentric cam end of the bearing inner ring when the bearing is assembled on the shaft The collar is engaged on the inner ring cam of the bearing This assembly grips the shaft tightly with a positive binding action that increases with use No adjustments of any kind are necessary The collar setscrew provides supplementary locking Easiest of all to install wide inner ring ball bearings with self locking collars are available in various sizes These bearings shown with various seal and inner ring width variations serve many purposes in farm and industrial applications RA RR Series Shroud Seal KRRB Series Extended Inner Ring Wide Inner Ring with Locking Collar with Locking Collar YA RR Series GC KRRB Series Concentric Collar Using the concentric collar the bearing is locked to the shaft by two setscrews 120 degrees apart tightened in the collar and passing through drilled holes in the inner ring These units are suited for applications where space is limited and reversing shaft rotation is encountered Bearing Types and cages continued A6 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A7 Engineering A A6 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A7 NEEDLE ROLLER BEARINGS Timken needle roller bearings are an economical alternative for applications requiring minimal space to carry a given load at a desired speed Needle roller bearings can be an ideal choice because of their ability to handle a given level of speed and load capacity yet have the smallest cross section of all roller bearing types and at a very attractive price Timken offers both inch and metric nominal bearings in popular designs such as drawn cups radial caged needle rollers machined ring track rollers thrust bearings combined bearings and drawn cup roller clutches Most of these bearing types can be operated directly on a machined shaft of suitable quality or with a matching inner ring where this requirement cannot be conventionally satisfied Radial Caged Needle Rollers Timken Torrington needle roller and cage radial assemblies have a steel cage that provides both inward and outward retention for the needle rollers The designs provide maximum cage strength consistent with the inherent high load ratings of needle roller bearings Accurate guidance of the needle rollers by the cage bars allows for operation at high speeds Needle roller and cage assemblies are manufactured with either one or two rows of needle rollers Drawn Cup Bearings The outer ring in the form of a cup is accurately drawn and no subsequent machining is performed to build the outer raceway Drawn cup needle roller bearings are available in open ends or single closed to protect the shaft end designs They are also available with one or two integral seals Other options include a single lubricating hole and matching inner ring Heavy Duty Machined Needle Roller Bearings These bearings are available in a wide range of inch and metric sizes plus an array of design features including integral seals side flanges or separate end washers inner rings oil holes and single or double caged sets or full complement of rollers Track Rollers Timken Torrington track rollers listed in this catalog have been designed with outer rings of large radial cross section to withstand heavy rolling and shock loads on track type or cam controlled equipment The outside diameters of the outer rings are either profiled or cylindrical Profiled track rollers are designed to alleviate uneven bearing loading resulting from deflection bending or misalignment in mounting Stud type track rollers are available with or without lip contact seals or with shields Yoke type track rollers are designed for straddle mounting Each yoke type is available with either needle roller and cage radial assemblies or with a single or double full complement row of cylindrical or needle rollers Thrust Bearings Needle roller and cage thrust assemblies are available in a variety of inch or metric sizes All types have very small cross sections If the back up surfaces cannot be used as raceways hardened washers are available Thrust bearings are available with needle rollers or heavier cylindrical rollers for high load carrying capacity Combined Radial and Thrust Bearings Timken combined bearings consist of a radial bearing needle roller bearing and a thrust bearing needle or other roller bearing Some combined bearings are constructed similar to drawn cups but with an added thrust bearing component Like other needle bearings these combined bearings can be matched with an optional inner ring or thrust washer as the opposing raceway Roller Clutches Drawn cup roller clutches transmit torque between the shaft and housing in one direction and allow free overrun in the opposite direction When transmitting torque either the shaft or the housing can be the input member Applications are generally described as indexing backstopping or overrunning In many respects construction is similar to that of drawn cup bearings utilizing the same low profile radial section as drawn cup bearings The precisely formed interior ramps provide surfaces against which the needle rollers wedge to positively lock the clutch with the shaft when rotated in the proper direction These ramps formed during the operation of drawing the cup are case hardened to assure long wear life The incorporation of ramp forming into the cup drawing operation is a Timken manufacturing innovation that contributes much to the low cost of the unit Bearing Types and cages continued Engineering A A8 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A9 A8 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A9 Bearing Needle Roller Drawn Cup Drawn Cup Needle Needle Roller Track Roller Needle Roller Needle Rollers Combination Design Type Cage Radial Needle Roller Roller Bearing Bearing Cage Thrust Bearing Assembly Bearing Caged Full Complement Inner Ring Assembly Capability Radial Load High Moderate High High Moderate None Very high High Axial Load None None None None Low Very high None High Limiting Speed Very high High Moderate Very high Moderate High Moderate Moderate Slope Tolerance Moderate Moderate Very low Moderate Moderate Low Very low Low Grease Life High High Low High Moderate Low Low Low Friction Very low Very low High Very low Low Moderate High Moderate Precision Very high Moderate Moderate High High High Very high High Cross Section Very low Low Low Moderate High Very low Very low High Cost Low Low Low High High Moderate Very low Very high NEEDLE ROLLER BEARING CAPABILITY COMPARISON BASED ON SUITABLE OIL LUBRICATION NEEDLE ROLLER BEARING SELECTION Because of the possible combinations of roller complement orientation bearing cross section thickness and raceway construction needle roller bearings should be given extra consideration for roller bearing applications selection The table below should be used as a general guideline for the application of Timken needle roller bearings Radial Caged Needle Roller Drawn Cup Needle Roller Heavy Duty Needle Roller Track Roller Thrust Needle Roller Combined Needle Roller Drawn Cup Roller Clutch Bearing Types and cages continued A8 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A9 Engineering A A8 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A9 radial spherical ROLLER BEARINGS The principle styles of radial spherical roller bearings are offered by Timken CJ YM YMB VCSJ and VCSM YM bearings offer the greatest range of sizes in all series They combine Timken design experience with proven performance in many industries All of the newer styles CJ YM and YMB offer higher load ratings for longer life CJ bearings include a stamped steel cage and are suitable for a broad range of general service applications For extreme conditions of use the YM and YMB style with a machined brass cage should be considered All styles are available in straight or tapered bores Tapered bore bearings can be ordered by placing a K immediately after the numbers in the bearing description e g 22311KYM Tapered bore bearings are available with adapter sleeve assemblies consisting of sleeve locknut and washer Adapter sleeve assemblies are designated SNW e g SNW117 Timken spherical roller bearings have been developed to accommodate radial and axial loads The internal geometry allows the inner ring to accommodate misalignment This capability is unique to spherical roller bearings allowing machine designers more tolerance and less restrictive assembly Other data is listed Timken spherical roller bearings are available in ten dimensional series conforming to ISO and ANSI ABMA standards An illustration is presented below Optional features available with Timken spherical roller bearings W33 Lubrication Groove and Oil Holes A lubrication groove and three oil holes are provided in the bearing outer ring This eliminates the expense of machining a channel in the housing bore for introducing lubricant to the bearing This design feature allows the lubricant to flow between the roller paths through a single lubrication fitting The lubricant moves laterally outward from the center of the bearing reaching all contact surfaces and flushing the bearing To order add the suffix W33 to the bearing number e g 22216W33 W22 Selected Outside Diameter Bearings Bearings with selected outside diameters are required in some applications Timken spherical roller bearings are available with reduced outside diameter tolerance This allows a close control of the fit between the bearing and housing To specify this feature add the suffix W22 to the bearing number e g 22216W22 Additional features are available consult your Timken representative for more information radial cylindrical ROLLER BEARINGS Standard Styles A Timken cylindrical roller bearing consists of an inner and outer ring a roller retaining cage and a complement of controlled contour cylindrical rollers Depending on the type of bearing either the inner or the outer ring has two roller guiding ribs The other ring is separable from the assembly and has one rib or none The ring with two ribs axially locates the position of the roller assembly The ground diameters of these ribs may be used to support the roller cage One of the ribs may be used to carry light thrust loads when an opposing rib is provided The decision as to which ring should be double ribbed is normally determined by considering assembly and mounting procedures in the application Types RU and RIU have double ribbed outer and straight inner rings Types RN and RIN have double ribbed inner and straight outer rings The use of either type at one position on a shaft is ideal for accommodating shaft expansion or contraction The relative axial displacement of one ring to the other occurs with minimum friction while the bearing is rotating These bearings may be used in two positions for shaft support if other means of axial location are provided Engineering 9 BR Tapered Bore Bearing with Adapter Sleeve Assembly YJC M YMB All of the newer styles CJ YM YMB and VCF offer higher load ratings for longer life CJ and YM bearings incorporate the advanced features of Torrington Trac Tru technology CJ bearings include a stamped steel cage and are suitable for a broad range of general service applications For extreme conditions of use the YM YMB style with a machined bronze cage should be considered The VCF style spherical roller bearing uses a cage made of high performance glass fiber reinforced polyamide The maximum continuous operating temperature under normal working conditions is 250 F 120 C All styles are available in straight or tapered bores Tapered bore bearings can be ordered by placing a K immediately after the numbers in the bearing description i e 22311KYM Tapered bore bearings are available with adapter sleeve assemblies consisting of sleeve locknut and washer Adapter sleeve assemblies are designated SNW i e SNW117 Torrington spherical roller bearings are available in 10 dimensional series conforming to ISO and ANSI ABMA standards A graphical illustration is presented below Optional features available with Torrington spherical roller bearings W33 Lubrication Groove and Oil Holes A lubrication groove and three oil holes are provided in the bearing outer ring This eliminates the expense of machining a channel in the housing bore for introducing lubricant to the bearing This design feature allows the lubricant to flow between the roller paths through a single lubrication fitting The lubricant moves laterally outward from the center of the bearing reaching all contact surfaces and flushing the bearing To order add the suffix W33 to the bearing number i e 22216W33 W22 Selected Outside Diameter Bearings Bearings with selected outside diameters are required in some applications Torrington spherical roller bearings are available with reduced outside diameter tolerance This allows a close control of the fit between the bearing and housing To obtain the accuracy desired the housing is usually ground or honed To specify this feature add the suffix W22 to the bearing number i e 22216W22 Additional features are available Consult the Torrington engineering department SERIES 223 233232222241231240230 312932 Tapered Bore Bearing with Adapter Sleeve Assembly YM YMBCJ Bearing Types and cages continued Engineering A A10 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A11 A10 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A11 5200 WS A5200 WS A 52XX WM 5200 Metric Series This series features enhanced radial load rating due to its internal design proportions In this series the outer ring is double ribbed and the inner ring is full width with a cylindrical O D The bearing also can be furnished without an inner ring for applications where radial space is limited When so used the shaft journal must be hardened to HRC 58 minimum and the surface finished to 15 RMS maximum The bearing is usually furnished with a rugged stamped steel cage S designation and is land riding on the outer ring ribs The cage features depressed bars which not only space rollers evenly but retain them as a complete assembly with the outer ring Cages of machined brass M designation are available for applications where reversing loads or high speeds might indicate their need Outer rings are made from bearing quality alloy steel The inner rings are deep case hardened to accommodate the hoop stresses resulting from heavy press fits The standard bearing is furnished with radial internal clearances designated as R6 tabulated in Radial Cylindrical Roller Section Other internal clearances can be supplied upon request Proper roller guidance is assured by integral ribs and roller end clearance control Types RJ and RIJ have double ribbed outer and single ribbed inner rings Types RF and RIF have double ribbed inner and single ribbed outer rings Both types can support heavy loads as well as light unidirectional thrust loads The thrust load is transmitted between the diagonally opposed rib faces in a sliding action When limiting thrust conditions are approached lubrication can become critical Your Timken representative should be consulted for assistance in such applications When thrust loads are very light these bearings may be used in an opposed mounting to locate the shaft In such cases shaft endplay should be adjusted at time of assembly Types RT and RIT have double ribbed outer and single ribbed inner ring with a loose rib that allow the bearing to provide axial location in both directions Types RP and RIP have a double ribbed inner ring and a single ribbed outer ring with a loose rib RIU RU NU RIN RN N RIJ RJ NJ RIF RF NF RIT RT NUP RIP RP NP Types RT and RP as well as RIT and RIP can carry heavy radial loads and light thrust loads in both directions Factors governing the thrust capacity are the same as for types RF and RJ bearings A type RT or RP bearing may be used in conjunction with type RN or RU bearings for applications where axial shaft expansion is anticipated In such cases the fixed bearing is usually placed nearest the drive end of the shaft to minimize alignment variations in the drive Shaft endplay or float is determined by the axial clearance in the bearing The type NU N NJ NF NUP and NP are similar in construction to their R counterparts however they conform to ISO and DIN standards for loose rib rings thrust collars and typical industry diameters over or under roller 5200 WS A5200 WS A 52XX WM 5200 WS A5200 WS A 52XX WM 5200 WS A5200 WS A 52XX WM A 52xx WS A 52xx WM 52xx WS A 52XX Bearing Types and cages continued A10 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A11 Engineering A A10 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A11 Tapered ROLLER BEARINGS Single Row Bearings TS Single Row This is the basic and the most widely used type of tapered roller bearing It consists of the cone assembly and the cup It is usually fitted as one of an opposing pair see choice of mounting configuration During equipment assembly single row bearings can be set to the required clearance endplay or preload condition to optimize performance TS TSF TDI TDIT TNA TNASW TNASWE Two row bearings TDO Double cup This has a one piece double cup and two single cones It is usually supplied complete with a cone spacer as a pre set assembly This configuration gives a wide effective bearing spread and is frequently chosen for applications where overturning moments are a significant load component TDO bearings can be used in fixed locating positions or allowed to float in the housing bore for example to compensate for shaft expansion TDODC or TDOCD cups also are available in most sizes These cups have holes in the O D that permit the use of pins to prevent cup rotation in the housing TDI Double cone TDIT Double cone with tapered bore Both comprise a one piece double cone and two single cups They are usually supplied complete with a cup spacer as a pre set assembly TDI and TDIT bearings can be used at fixed locating positions on rotating shaft applications For rotating housing applications the double cone of Type TDI can be used to float on the stationary shaft Type TDIT has a tapered bore to facilitate removal when an interference fit is essential yet regular removal is required TNA Non adjustable TNASW Non adjustable with lubricant slots TNASWE Non adjustable with lubricant slots and extended back face rib These three bearing types are similar to the TDO comprised of a one piece double cup and two cones The cone front faces are extended so they abut eliminating the need for a separate cone spacer Supplied with a built in clearance to give a standard setting range as listed these bearings provide a solution for many fixed or floating bearing applications where optimum simplicity of assembly is required Types TNASW and TNASWE are variations having chamfers and slots on the front face of the cone to provide lubrication through the shaft Type TNASWE have extended back face ribs on the cones which are ground on the O D to allow for the use of a seal or stamped closure typically for use on stationary shaft applications TSF Single row with flanged cup Variation on the basic single row bearing type TSF has a flanged cup to facilitate axial location and accurately aligned seats in a through bored housing Bearing Types and cages continued Engineering A A12 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A13 A12 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A13 2TS IM 2TS DM 2TS TM SRSS SR Set Right TM assembly Type SR are made to a standard setting range based on Timken s Set Right automated setting technique suitable for most industrial applications They have two spacers and an optional snap ring that may be used for axial location Because both types are made up of popular sizes of single row bearings they provide a low cost option for many applications THERE ARE THREE BASIC TYPES OF SPACER ASSEMBLIES Type 2TS IM indirect mounting These consist of two single row bearings with a cone and cup spacer In some applications the cup spacer is replaced by a shoulder in the bearing housing Type 2TS DM direct mounting These consist of two single row bearings with cones abutting and a cup spacer They are generally used at fixed locating positions on rotating shaft applications Type 2TS TM tandem mounting Where combined radial and thrust load capacity is required but the thrust component is beyond the capacity of a single bearing within a given maximum O D two single row bearings can be mounted in tandem Appropriate cone and cup spacers are supplied Consult your Timken representative for the most effective and economical solution Spacer assemblies Any two single row bearings Type TS can be supplied as a two row pre set ready to fit assembly by the addition of spacers machined to pre determined dimensions and tolerances This principle is adopted in two standard ranges of spacer assemblies listed in the main sections of this guide types SS and SR However the concept can be applied to produce custom made two row bearings to suit specific applications In addition to providing a bearing that automatically gives a pre determined setting at assembly without the need for a manual setting it is possible to modify the assembly width to suit an application simply by varying the spacer lengths SS Two single row assembly Often referred to as snap ring assemblies Type SS consist of two basic single row bearings Type TS They are supplied complete with cone and cup spacers to give a pre determined bearing setting when assembled Type SS have a specified setting range to suit the duty of the application They have a cone spacer and a snap ring which also serves as the cup spacer to give axial location in a through bored housing Bearing Types and cages continued A12 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A13 Engineering A A12 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A13 PACKAGED BEARINGS Pinion Pac TM The Pinion Pac bearing is a ready to install pre set and sealed package consisting of two rows of tapered roller bearings mounted in a carrier It is custom designed for the final drive pinions of heavy commercial vehicles The package gives the differential pinion builder considerable improvements in reliability ease of assembly and supply logistics UNIPAC TM The UNIPAC bearing is a two row tapered roller bearing supplied as a maintenance free pre set pre lubricated and sealed package Originally designed for the high volume needs of passenger car wheels the UNIPAC bearing now has wider application in wheel hubs of heavy vehicles as well as in industrial equipment The UNIPAC bearing provides improvements in reliability ease of assembly and supply logistics UNIPAC PLUS TM The UNIPAC PLUS bearing is a ready to install pre set sealed and lubricated for life two row assembly with a flanged outer ring It is a maintenance free heavy vehicle wheel package The package enables a reduction in the wheel weight by eliminating the traditional wheel hub and has the advantage of improving reliability assembly and supply logistics An added advantage for disc brake equipped axles is ease of mounting AP TM Bearing The AP bearing is a self contained assembly made in a wide range of sizes It consists of two single cones a counterbored double cup a backing ring two radial seals an end cap and cap screws The AP bearing is supplied as a pre set pre lubricated and sealed package SP TM Bearing Similar in concept to AP bearings the SP bearing is designed specifically for journal bearings on high speed rail applications The SP bearing type differs from the AP bearing in that SP bearings have labyrinth seals are more compact in size and are manufactured to metric boundary dimensions SEALED BEARINGS TSL The TSL incorporates a DUO FACE PLUS seal making it an economical choice for grease lubricated applications at moderate speeds UNIPAC TM AP TM SP TMPINION PAC TM TSL Bearing Types and cages continued UNIPAC PLUS TM Engineering A A14 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A15 A14 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A15 other two row BEARINGS Type TDIE Extended double cone Type TDIA These two row bearings are designed for applications where it is required to lock the loose fitted cone to a shaft with provision also for effective closure or sealing typically on pillow blocks disc harrow and similar agricultural machinery shafts and line shafts Type TDIE is available in two forms cylindrical bore with the cone extended at both ends and provisions for setscrews and locking collars at each end or with an inherently self locking square bore ideal for farm machinery applications Type TDIA is similar to type TDIE with a cylindrical bore There is a provision for a locking collar at one end only The compact configuration is suited to pillow blocks and similar applications On all types the hardened and ground O D of the cone extension provides an excellent surface for effective closure or sealing Type TNASWH Non adjustable heavy duty double cup Type TNASWHF Non adjustable heavy duty with flanged double cup These are two row bearing assemblies with two cones and a one piece cup similar to type TNASWE listed in this guide The cups have a heavy wall section allowing the bearings to be used directly as steady rest rollers in sheet and strip levellers or with a flange Type TNASWHF as a complete wheel assembly for use on rails The cup is extended at both ends and counterbored to accept stamped closures The bearings can be supplied with these ready fitted as a unit assembly but not pre lubricated Rubbing seals are available for certain sizes TXR TNASWHTNASWHF TDIE TDIE Square Bore TDIA TSMA TSHR PRECISION BEARINGS TS and TSF single row bearings These bearings are similar in design to the types described on page A11 They are only produced in high precision quality to be used in machine tool spindles printing press cylinders and other applications where accuracy of rotation is required TSHR Hydra Rib TM bearing with preload adjustment device For many applications notably in the machine tool industry bearings are required to run at high speeds with a controlled preload setting The Hydra Rib bearing has a floating cup rib controlled by hydraulic or pneumatic pressure which ensures that the required bearing preload is maintained irrespective of the differential expansions or changes in loading taking place within the system High Speed BEARINGS TSMA Single row with axial oil provision Some applications require extreme high speed capability where special lubrication methods must be provided The TSMA is a single row bearing with a special provision for lubrication of the critical roller rib contact area to ensure adequate lubrication at high speeds The concept works by capturing oil in a manifold attached to the cone which is then directed to the rib roller contact area through holes drilled axially through the large cone rib Consult your Timken representative for other high speed bearing designs with specialized lubrication methods TXR Crossed roller bearing A crossed roller bearing is two sets of bearing races and rollers brought together at right angles with alternate rollers facing opposite directions within a section height not much greater than that of a TS bearing The steep angle tapered geometry of the bearing causes the load carrying center of each of the races to be projected along the axis resulting in a total effective bearing spread many times greater than the width of the bearing itself This type of bearing offers a high resistance to overturning moments The normal design of the bearing is type TXRDO which has a double cup and two cones with rollers spaced by polymer separators Crossed roller bearings are manufactured in precision classes Bearing Types and cages continued A14 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A15 Engineering A A14 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A15 Thrust Bearings Standard types of thrust bearings manufactured by Timken are included in this section Each type is designed to take thrust loads but four types TVL DTVL TTHD and TSR accommodate radial loads as well All types reflect advanced design concepts with large rolling elements for maximum capacity In roller thrust bearings controlled contour rollers are used to insure uniform full length contact between rollers and raceways with resultant high capacity Thrust bearings should operate under continuous load for satisfactory performance Type TVB Grooved race thrust ball bearing Type TVL Angular contact thrust ball bearing Type DTVL Two direction angular contact thrust ball bearing Type TP Thrust cylindrical roller bearing Type TPS Self aligning thrust cylindrical roller bearing Type TTHD Thrust tapered roller bearing Type TSR Thrust spherical roller bearing Type TTVF V Flat thrust tapered roller bearing Type TTVS Self aligning V Flat thrust tapered roller bearing Type TTSP Steering pivot thrust cylindrical roller bearing four row BEARING ASSEMBLIES Four row bearings combine the inherent high load radial thrust capacity and direct indirect mounting variations of tapered roller bearings into assemblies of maximum load rating in a minimum space Their main application is on the roll necks of rolling mill equipment All four row bearings are supplied as pre set matched assemblies with all components numbered to ensure correct installation sequence Type TQO Type TQOW These pairs of directly mounted bearings consist of two double cones two single and one double cup with a cone spacer and two cup spacers These types are used on roll necks of low and medium speed rolling mills applied to the necks with a loose fit When the fillet and or filler rings do not have lubrication slots they are provided in the faces of the bearing cones Type TQOW Slots in the cone spacer permit lubricant to flow from the bearing chamber to the roll neck The cone spacers also are hardened to minimize face wear Sealed roll neck The sealed roll neck bearing is similar to the TQO A specially designed sealing arrangement is incorporated in the bearing to endure highly contaminated environments The special seal design is built into the bearing to eliminate contamination from outside the bearing envelope and extend the useful life Sealed Roll Neck Bearing TQITS TQITSE Type TQITS Type TQITSE The main feature of these bearings is a tapered bore the taper being matched and continuous through the cones This permits an interference fit on the backup rolls of high speed mills where a loose cone fit of a straight bore type TQO bearing could result in excessive neck wear These four row bearings consist of two pairs of indirectly mounted bearings two single and one double cone four single cups and three cup spacers The relevant faces of the cones are extended so that they abut eliminating the need for cone spacers The indirect mounting of the bearing pairs increase the overall effective spread of the bearing to give optimum stability and roll rigidity Type TQITSE is the same as TQITS but has an extension to the large bore cone adjacent to the roll body This not only provides a hardened concentric and smooth surface for radial lip seals but also improves roll neck rigidity by eliminating a fillet ring This allows the centerline of the bearing to move closer to the roll body It also permits shorter and less costly rolls TQO TQOW Bearing Types and cages continued Engineering A A16 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A17 A16 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A17 Thrust Ball Bearings Thrust ball bearings are used for lighter loads and higher speeds than thrust roller bearings Type TVB ball thrust bearing is separable and consists of two hardened and ground steel washers with grooved raceways and a cage that separates and retains precision ground and lapped balls The standard cage material is brass but this may be varied according to the requirements of the application Timken Standard Tolerances for Type TVB bearings are equivalent to ABEC 1 where applicable but higher grades of precision are available Type TVB bearing provides axial rigidity in one direction and its use to support radial loads is not suggested Usually the rotating washer is shaft mounted The stationary washer should be housed with sufficient O D clearance to allow the bearing to assume its proper operating position In most sizes both washers have the same bore and O D The housing must be designed to clear the O D of the rotating washer and it is necessary to step the shaft to clear the bore of the stationary washer Type TVL is a separable angular contact ball bearing primarily designed for unidirectional thrust loads The angular contact design however will accommodate combined radial and thrust loads since the loads are transmitted angularly through the balls The bearing has two hardened and ground steel rings with ball grooves and a one piece brass cage that spaces the ball complement Although not strictly an angular ball bearing the larger ring is still called the outer ring and the smaller the inner ring Timken Standard Tolerances for type TVL bearings are equivalent to ABEC 1 where applicable but higher grades of precision are available Usually the inner ring is the rotating member and is shaft mounted The outer ring is normally stationary and should be mounted with O D clearance to allow the bearing to assume its proper operating position If combined loads exist the outer ring must be radially located in the housing Type TVL bearings should always be operated under thrust load Normally this presents no problem as the bearing is usually applied on vertical shafts in oil field rotary tables and machine tool indexing tables If constant thrust load is not present it should be imposed by springs or other built in devices Low friction cool running and quiet operation are advantages of this type of TVL bearing which may be operated at relatively high speeds The bearing also is less sensitive to misalignment than other types of rigid thrust bearings DTVL is similar in design to TVL except the DTVL has an additional washer and ball complement permitting it to carry moderate thrust in one direction and light thrust in the other direction Thrust Cylindrical Roller Bearings Thrust cylindrical roller bearings withstand heavy loads at relatively moderate speeds Standard bearings can be operated at bearing O D peripheral speeds of 3000 fpm 15 m s Special design features can be incorporated into the bearing and mounting to attain higher operating speeds Because loads are usually high extreme pressure EP lubricants should be used with roller thrust bearings Preferably the lubricant should be introduced at the bearing bore and distributed by centrifugal force All types of thrust roller bearings are made to Timken Standard Tolerances Higher precision may be obtained when required Type TP thrust cylindrical roller bearing has two hardened and ground steel washers with a cage retaining one or more controlled contour rollers in each pocket When two or more rollers are used in a pocket they are of different lengths and are placed in staggered position in adjacent cage pockets to create overlapping roller paths This prevents wearing grooves in the raceways and prolongs bearing life Because of the simplicity of their design Type TP bearings are economical Since minor radial displacement of the raceways does not affect the operation of the bearing its application is relatively simple and often results in manufacturing economies for the user Shaft and housing seats must be square to the axis of rotation to prevent initial misalignment problems Type TPS bearings are the same as Type TP bearings except one washer is spherically ground to seat against an aligning washer thus making the bearing adaptable to initial misalignment Its use is not suggested for operating conditions where alignment is continuously changing dynamic misalignment Thrust Spherical Roller Bearings Type TSR The TSR thrust spherical roller bearing design achieves a high thrust capacity with low friction and continuous roller alignment The bearings can accommodate pure thrust loads as well as combined radial and thrust loads Typical applications are air regenerators centrifugal pumps and deep well pumps Maximum axial misalignment between inner and outer ring is 2 5 degrees TP TPS TSR DTVLTVLTVB Bearing Types and cages continued A16 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A17 Engineering A A16 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A17 TTC Cageless TTSP Steering pivot There are two basic types of Timken thrust bearings designed for specific fields of duty where the only load component is thrust TTC and TTSP The TTC bearing uses a full complement of rollers without a cage and is used when the speeds are slow The TTSP bearing uses a cage and was designed for the oscillating motion of steering pivot positions TTSPTTC TTHDSXTTHDFL TTVSTTVF TTHDSV Type TTVF Type TTVS Type TTHDFL Type TTHDSV Type TTHDSX V Flat Tapered Roller bearings TTVF and TTVS combine the best features of thrust tapered and cylindrical roller bearings offering the highest possible capacity of any thrust bearing of its size V Flat design includes one flat washer and the second with a tapered raceway matching the rollers Design was originally developed for screwdown applications in metal rolling mills where thrust loads exceeding one million pounds are common These bearings have exceptional dynamic capacity within a given envelope and provide superior static capacity They have been highly successful in heavily loaded extruders in cone crushers and other applications where a wide range of operating conditions are found TTHD Thrust Tapered Roller Bearings Type TTHD Type TTHD thrust tapered roller bearing has an identical pair of hardened and ground steel washers with conical raceways and a complement of controlled contour tapered rollers equally spaced by a cage In the design of Type TTHD the raceways of both washers and the tapered rollers have a common vertex at the bearing center This assures true rolling motion TTHD bearings are well suited for applications such as crane hooks where extremely high thrust loads and heavy shock must be resisted and some measure of radial location obtained Most sizes utilize cages with hardened pins through the center of the rollers allowing closer spacing of the rollers to maximize capacity Smaller sizes have cast brass cages carefully machined to permit full flow of lubricant Self aligning V Flat bearings TTVS employ the same basic roller and raceway design except the lower washer is in two pieces with the contacting faces spherically ground permitting self alignment under conditions of initial misalignment TTVS bearings should not be used if dynamic misalignment changing under load is expected For very low speed heavily loaded applications these bearings are supplied with a full complement of rollers for maximum capacity and are identified in the table of dimensions For application review of the full complement Type TTHD bearing consult your Timken representative Bearing Types and cages continued Engineering A A18 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A19 A18 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A19 Cages Cages sometimes referred to as rolling element separators or retainers perform an important function in the proper operation of rolling bearings They serve to maintain uniform rolling element spacing in the races of the inner and outer rings of the bearings as the rolling elements pass into and out of the load zones Cage types in several materials and configurations have been developed by Timken to meet various service requirements Temperature limitations are described later in this section Some of the materials from which cages are made include pressed steel pressed brass machined brass machined steel and compositions of various synthetic materials Steel Cages for Radial Ball Bearings Steel cages are generally ball piloted and are available in the following types Pressed Steel Finger Type Cages SR Light in weight and made from strong cold rolled steel the pressed steel cage because of its compactness is the optimum design for use in shielded and sealed bearings which must conform to ABEC boundary dimensions This is a general purpose design and is frequently used for ABEC 1 ball bearing sizes PRB molded nylon cages provide uniformity of ball pocket clearances for consistent operation They are suitable for temperatures up to 120 C 250 F continuous operation and can tolerate 150 C 300 F for short periods These cages are available in conrad K bearings and are standard for the more popular wide inner ring bearing series Pressed Steel Welded Cages WR The welded steel cage provides greater strength increased rigidity and better pocket alignment than the finger type The projection welding of the cage halves eliminates weakening notches or holes and fingers or rivets It assures better mating of cage halves circumferentially and radially This construction also provides more uniformity of ball to pocket clearance Improved pocket geometry permits higher speeds reduces cage wear provides cooler operation and improves and extends lubricant life This cage is standard in most radial non filling slot bearings of the open shielded and sealed types Molded Cages for Radial Ball Bearings Molded cages are either ball piloted or land piloted and are available in the following types Nylon PRB One piece molded snap in 6 6 nylon cages are specially processed to provide Toughness at moderately high and low temperatures Resistance to abrasion Resistance to organic solvents oils and grease Natural lubricity Long term service at temperatures up to 120 C 250 F Dimensional stability These cages offer superior performance in applications involving misalignment due to their greater flexibility Bearing Types and cages continued A18 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A19 Engineering A A18 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A19 BR MBR Reinforced Nylon PRC Molded 6 6 nylon reinforced with 30 percent by weight glass fibers This material is used primarily for one piece ring piloted cages used in precision grades of angular contact bearings PRC cages offer outstanding strength and long term temperature resistance Molded to very close tolerances and uniformity combined with light weight design they permit higher speeds and reduced noise They are suitable for temperatures up to 150 C 300 F PRC cages are usually the one piece outer piloted L type design but are also available in one piece ball controlled designs Brass and Steel Cages Brass cages are generally installed in bearings which are designed for use on heavily loaded applications such as deep well pumps woodworking machinery and heavy construction machinery The following types of Timken brass cages are available Iron Silicon Brass Cage SMBR and Machined Steel Cage MSR The SMBR and MSR cages are ring piloted The advantages of these cages are high strength even at elevated temperatures see chart on page A167 as well as high speed capability due to the ring piloted construction In many cases these cages are silver plated for use in applications requiring high reliability They are available in both ball and roller bearings Cast Brass Cage BR This cage a ball piloted brass retainer designated by the letters BR utilizes two identical halves which are riveted together Bearing Types and cages continued Special Molded Cages For very high speeds or very high temperature applications special materials can be used Nylon with a PTFE additive is available for molded cages required for high speed applications For applications involving high operating temperatures up to 232 C 450 F molded cages made of fiber reinforced polyphenelyene sulfide can be made For availability of these special cages please consult your Timken representative Machined Brass Cage MBR These cages are machined all over to provide ring riding surfaces and good static and dynamic balance They are commonly incorporated as inner ring piloted designs in the 7000 angular contact product family Because of their superior strength these cages are generally used on heavily loaded applications such as deep well pumps woodworking machinery and heavy construction machinery Composition Cages CR Composition cages combine light weight precision and oil absorbing features which are particularly desirable for use on high speed applications This CR cage is a ring piloted type and is particularly associated with the outer ring piloted extra precision WN series bearings Special Cages For certain very high contact angle light section aircraft bearings molded nylon snake cages are employed Cages are also made with high temperature materials see page A167 in the various configurations described above For availability of special cages please contact your Timken representative Engineering A A20 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A21 A20 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A21 Cages for SPHERICAL ROLLING BEARINGS Brass Cages YM Bearing cages are one piece design centrifugally cast and precision machined The rugged construction of this cage type provides an advantage in more severe applications Due to its design this cage permits YM bearings to incorporate greater load carrying capabilities The open end design permits lubricant to reach all surfaces easily assuring ample lubrication and a cooler running bearing Stamped Steel Cages CJ These cages are used in CJ bearings and are designed to permit extra load carrying capabilities in the bearing Two independent cages one for each row of rollers are assembled in an individual bearing Pin Type Cages Large diameter spherical roller bearings can be supplied with these cages The design of pin type cages permits an increased roller complement thus giving the bearing enhanced load carrying ability Consult your Timken representative for suggestions on the application of this cage Cages for RADIAL CYLINDRICAL ROLLER BEARINGS Brass Cages These are primarily roller guided cages with cylindrical bored pockets They are used with the standard style roller bearings Stamped Steel Cages Stamped steel cages of varying designs are available in the standard style cylindrical roller bearings The stamped steel cage for the 5200 series is a land riding cage piloted by the outer ring ribs The cage features depressed bars which not only space rollers evenly but retain them as a complete assembly with the outer ring cages for TAPERED ROLLER BEARINGS Stamped Steel Cages The cages are of compact space savings design and in some cases permit increased load carrying capabilities to be incorporated into the bearing They are roller riding with bridges positioned above the pitch line to retain the rollers within the cone Machined Cages These heavy section ruggedly constructed cages are fully machined and are land riding on the thrust and toe flange O D of the cone inner ring The bridges between the straight through machined roller pockets are staked above the pitch line to retain the rollers with the cone YM Cage CJ Pin Type Cages This steel cage design features a pin which fits closely with a bored hole in the roller The rollers can thus be retained with a minimum space between the rollers so that an increased complement of rollers can be incorporated This results in greater load carrying capabilities in the bearing Brass Cage Bearing Types and cages continued A20 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A21 Engineering A A20 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A21 Symbol Description Units a1 Reliability Life Factor a2 Material Life Factor a3 Operating Condition Life Factor a3d Debris Life Factor a3h Hardness Life Factor a3k Load Zone Life Factor a3l Lubrication Life Factor a3m Misalignment Life Factor a3p Low Load Life Factor ae Effective Bearing Spread mm in b Tooth Length mm in c1 c2 Linear Distance positive or negative mm in C Dynamic Radial Load Rating N lbf C0 Static Load Rating N lbf Cp Specific Heat of Lubricant J kg C BTU lb x F d Bearing bore diameter mm in d0 Mean inner race diameter mm in dc Distance Between Gear Centers mm in dm Mean Bearing Diameter mm in ds Shaft inside diameter mm in D Bearing outside diameter mm in D0 Mean outer race diameter mm in DH Housing outside diameter mm in Dm Mean Diameter or Effective Working Diameter of a Sprocket Pulley Wheel or Tire Also Tapered Roller Mean Large Rib Diameter mm in DmG Mean or Effective Working Diameter of the Gear mm in DmP Effective Working Diameter of the Pinion mm in DmW Effective Working Diameter of the Worm mm in DpG Pitch Diameter of the Gear mm in DpP Pitch Diameter of the Pinion mm in DpW Pitch Diameter of the Worm mm in e Life Exponent Lubricant Flow Rate L min U S pt min 0 Viscous Dependent Torque Coefficient 1 Load Dependent Torque Coefficient B Belt or Chain Pull Factor F General Term for Force N lbf Fa Applied Thrust Axial Load N lbf Fai Induced Thrust Axial Load due to Radial Loading N lbf Fac Induced Thrust Axial Load due to Centrifugal Loading N lbf FaG Thrust Force on Gear N lbf FaP Thrust Force on Pinion N lbf FaW Thrust Force on Worm N lbf B Belt or Chain Pull N lbf Fc Centrifugal Force N lbf Fr Applied Radial Load N lbf FsG Separating Force on Gear N lbf FsP Separating Force on Pinion N lbf FsW Separating Force on Worm N lbf Fte Tractive Effort on Vehicle Wheels N lbf FtG Tangential Force on Gear N lbf FtP Tangential Force on Pinion N lbf FtW Tangential Force on Worm N lbf FW Force of Unbalance N lbf h Horizontal used as subscript H Power kW or HP kW HP HFs Static Load Rating Adjustment Factor for Raceway Hardness Symbol Description Units k Centrifugal Force Constant lbf RPM 2 k1 Bearing Torque Constant k4 k5 k6 Dimensional Factor to calculate heat generation K Tapered Roller Bearing Radial to Axial Dynamic Load Rating Factor l Thrust Needle Roller Length mm in L Lead Axial Advance of a Helix for One Complete Revolution mm in L Distance between bearing geometric center lines mm in m Gearing Ratio M Bearing Operating Torque or Moment N m N mm lb in n Bearing Operating Speed or General Term for Speed rot min RPM nG Gear Operating Speed rpm rot min RPM nP Pinion Operating Speed rpm rot min RPM nW Worm Operating Speed rpm rot min RPM NG Number of Teeth in the Gear NP Number of Teeth in the Pinion NS Number of Teeth in the Sprocket P0 Static Equivalent Load N lbf P0a Static Equivalent Thrust Axial Load N lbf P0r Static Equivalent Radial Load N lbf Pr Dynamic Equivalent Radial Load N lbf Q Generated Heat or Heat Dissipation Rate W BTU min T Torque N m lb in v Vertical used as subscript V Linear Velocity or Speed km h mph Vr Rubbing Surface or Tapered Roller Bearing Rib Velocity m s fpm X Dynamic Radial Load Factor X0 Static Radial Load Factor Y Dynamic Thrust Axial Load Factor Y0 Static Thrust Axial Load Factor G Bevel Gearing Gear Pitch Angle deg Hypoid Gearing Gear Root Angle deg P Bevel Gearing Pinion Pitch Angle deg Hypoid Gearing Pinion Face Angle deg Coefficient of linear expansion mm mm C in in F S Interference fit of inner race on shaft mm in H Interference fit of outer race in housing mm in Efficiency Decimal Fraction 1 2 3 Gear Mesh Angles Relative to the Reference Plane deg i o Oil inlet or outlet temperature C F Worm Gear Lead Angle deg Coefficient of Friction v Lubricant Kinematic Viscosity cSt 0 Approximate Maximum Contact Stress MPa psi G Normal Tooth Pressure Angle for the Gear deg P Normal Tooth Pressure Angle for the Pinion deg G Helix Helical or Spiral Angle for the Gear deg P Helix Helical or Spiral Angle for the Pinion deg T Temperature difference between shaft inner race rollers and housing bearing outer race C F Lubricant Density kg m 3 lb ft 3 SUMMARY OF SYMBOLS USED TO DETERMINE APPLIED LOADS AND BEARING ANALYSIS Determination of applied loads and Bearing Anal ysis Engineering A A22 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A23 A22 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A23 FaP FsP FtP FsG FaG FtG FsP FtP FsG FtG Determination of applied loads Gearing Spur gearing Fig A 1 Tangential force FtG 1 91 x 10 7 H newtons DpGnG 1 26 x 10 5 H lbf in DpGnG Separating force FsG FtG tan G Single helical gearing Fig A 2 Tangential force FtG 1 91 x 10 7 H newtons DpGnG 1 26 x 10 5 H lbf in DpGnG Separating force FsG FtG tan G cos G Thrust force FaG FtG tan G Fig A 1 Spur gearing Fig A 2 Helical gearing C lo c k wise C ount e rclo c k w i s e Thrustaway pinionapex Positive Straight bevel and zerol gearing with zero degrees spiral Fig A 3 In straight bevel and zerol gearing the gear forces tend to push the pinion and gear out of mesh such that the direction of the thrust and separating forces are always the same regardless of direction of rotation Fig A 3 In calculating the tangential force FtP or FtG for bevel gearing the pinion or gear mean diameter DmP or DmG is used instead of the pitch diameter DpP or DpG The mean diameter is calculated as follows DmG DpG b sin G or DmP DpP b sin P In straight bevel and zerol gearing FtP FtG Pinion Tangential force FtP 1 91 x 10 7 H newtons DmP np 1 26 x 10 5 H lbf in DmP np Thrust force F P FtP tan P sin P Separating force FsP FtP tan P cos P Determination of Applied Loads The following equations are used to determine the forces developed by machine elements commonly encountered in bearing applications Determination of applied loads and bearing anal ysis continued Fig A 3 Straight bevel and zerol gears thrust and separating forces are always in same direction regardless of direction of rotation A22 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A23 Engineering A A22 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A23 Determination of applied loads and bearing anal ysis continued Straight bevel gear Fig A 4 Tangential force FtG 1 91 x 10 7 H newtons DmG nG 1 26 x 10 5 H lbf in DmG nG Thrust force FaG FtG tan G sin G Separating force FsG FtG tan G cos G Spiral bevel and hypoid gearing Fig A 5 In spiral bevel and hypoid gearing the direction of the thrust and separating forces depends upon spiral angle hand of spiral direction of rotation and whether the gear is driving or driven see Table 1 The hand of the spiral is determined by noting whether the tooth curvature on the near face of the gear Fig A 5 inclines to the left or right from the shaft axis Direction of rotation is determined by viewing toward the gear or pinion apex In spiral bevel gearing FtP FtG In hypoid gearing FtP FtG cos P cos G Hypoid pinion effective working diameter DmP DmG Np cos G NG cos P Tangential force FtG 1 91 x 10 7 H newtons DmG nG 1 26 x 10 5 H lbf in DmG nG Hypoid gear effective working diameter DmG DpG b sin G FtP FaP FsP FtG FsG FaG _ Count e rc lo c k w i s e C lo c k w ise PositiveThrustaw ay from pinion apex N egativeThrusttow ard pinion apex FaG FsG FtP FaP FsP FtG Fig A 4 Straight bevel gearing Fig A 6 Spiral bevel and hypoid gearing Fig A 5 Spiral bevel and hypoid gears the direction of thrust and separating forces depends upon spiral angle hand of spiral direction of rotation and whether the gear is driving or driven Engineering A A24 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A25 A24 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A25 Table 1 Straight worm gearing Fig A 7 Worm Tangential force FtW 1 91 x 10 7 H newtons DpW n W 1 26 x 10 5 H lbf in DpW n W Thrust force FaW 1 91 x 10 7 H newtons DpG n G 1 26 x 10 5 H lbf in DpG n G or FaW FtW tan Separating force FsW FtW sin cos sin cos Fig A 7 Straight worm gearing FsW FtW FaW FaG FsGFtG Determination of applied loads and bearing anal ysis continued Driving member rotation Thrust force Separating force Right hand spiral clockwise or Left hand spiral counterclockwise Right hand spiral counterclockwise or Left hand spiral clockwise FaP FtP tan P sin P sin P cos P cos P Driving member FaG FtG tan G sin G sin G cos G cos G Driven member FaP FtP tan P sin P sin P cos P cos P Driving member Driven member FaG FtG tan G sin G sin G cos G cos G Driving member Driven member Driving member Driven member FsP FtP tan P cos P sin P sin P cos P FsG FtG tan G cos G sin G sin G cos G FsP FtP tan P cos P sin P sin P cos P FsG FtG tan G cos G sin G sin G cos G Spiral bevel and hypoid gearing equations A24 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A25 Engineering A A24 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A25 Worm Gear Tangential force FtG 1 91 x 10 7 H newtons DpG n G 1 26 x 10 5 H lbf in DpG n G or FtG FtW tan Thrust force FaG 1 91 x 10 7 H newtons DpW n W 1 26 x 10 5 H lbf in DpW n W Separating force FsG FtW sin cos sin cos where tan 1 DpG tan 1 L m DpW DpW cos tan cos cot Metric system 5 34 x 10 7 Vr 3 0 146 0 103 Vr 0 09 Vr DpW n W meters per second 1 91 x 10 4 cos Inch system 7 x 10 14 Vr 3 0 235 0 103 Vr 0 09 Vr DpW n W feet per minute 3 82 cos Approximate coefficient of friction for the 0 015 to 15 m s 3 to 3000 ft min rubbing velocity range Double enveloping worm gearing Worm Tangential force FtW 1 91 x 10 7 H newtons DmW n W 1 26 x 10 5 H lbf in DmW n W Thrust force FaW 0 98 FtG Separating force FsW 0 98 FtG tan cos Worm GEAR Tangential force FtG 1 91 x 10 7 H m newtons DpG n W 1 26 x 10 5 H m lbf in DpG n W or FtG 1 91 x 10 7 H newtons DpG nG 1 26 x 10 5 H lbf in DpG nG Thrust force FaG 1 91 x 10 7 H newtons DmW n W 1 26 x 10 5 H lbf in DmW n W Separating force FsG 0 98 FtG tan cos where efficiency refer to manufacturer s catalog DmW 2dc 0 98 DpG Lead angle at center of worm tan 1 DpG tan 1 L m DpW DpW Use this value for FtG for bearing loading calculations on worm gear shaft For torque calculations use the following FtG equa tions Use this value for calculating torque in subsequent gears and shafts For bearing loading calculations use the equation for FaW Determination of applied loads and bearing anal ysis continued Engineering A A26 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A27 A26 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A27 Type fB Chains single 1 00 Chains double 1 25 V belts 1 50 Table 2 Belt or chain pull factor based on 180 degrees angle of wrap F 2 Tension slack side F b F 1 Tension tigh t side D m Standard roller chain sprocket mean diameter Dm P sin 180 Ns Centrifugal force Centrifugal force resulting from imbalance in a rotating member Fc Fw r n 2 newtons 8 94 x 10 5 Fw r n 2 lbf in 3 52 x 10 4 Shock loads It is difficult to determine the exact effect that shock loading has on bearing life The magnitude of the shock load depends on the masses of the colliding bodies their velocities and deformations at impact The effect on the bearing depends on how much of the shock is absorbed between the point of impact and the bearings as well as whether the shock load is great enough to cause bearing damage It also is dependent on frequency and duration of shock loads At a minimum a suddenly applied load is equivalent to twice its static value It may be considerably more than this depending on the velocity of impact Shock involves a number of variables that generally are not known or easily determined Therefore it is good practice to rely on experience The Timken Company has years of experience with many types of equipment under the most severe loading conditions Your Timken representative should be consulted on any application involving unusual loading or service requirements General formulas Tractive effort and wheel speed The relationships of tractive effort power wheel speed and vehicle speed are Metric system H Fte V kW 3600 n 5300 V rev min Dm Inch system H Fte V HP 375 n 336 V rev min Dm Torque to power relationship Metric system T 60 000 H N m 2 n H 2 n T kW 60 000 Inch system T 395 877 H lbf in 2 n H 2 n T HP 395 877 Belt and chain drive factors Fig A 8 Due to the variations of belt tightness as set by various operators an exact equation relating total belt pull to tension F1 on the tight side and tension F2 on the slack side Fig A 8 is difficult to establish The following equation and Table 2 may be used to estimate the total pull from various types of belt and pulley and chain and sprocket designs Fb 1 91 x 10 7 H fB newtons Dm n 1 26 x 10 5 H fB lbf in Dm n Fig 9 8 Fig A 8 Belt or chain drive Determination of applied loads and bearing anal ysis continued A26 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A27 Engineering A A26 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A27 Bearing REACTIONS Equations and procedure for determining bearing reactions follow Effective spread When a load is applied to a tapered roller or angular contact ball bearing the internal forces at each rolling element to outer raceway contact act normal to the raceway These forces have radial and axial components With the exception of the special case of pure thrust loads the inner ring and the shaft will experience moments imposed by the asymmetrical axial components of the forces on the rollers Shaft on two supports Simple beam equations are used to translate the externally applied forces on a shaft into bearing reactions acting at the bearing effective centers With two row tapered and angular contact ball bearings the geometric center of the bearing is considered to be the support point except where the thrust force is large enough to unload one row Then the effective center of the loaded row is used as the point from which bearing load reactions are calculated These approaches approximate the load distribution within a two row bearing assuming rigid shaft and housing These are statically indeterminate problems in which shaft and support rigidity can significantly influence bearing loading and require the use of computer programs to solve Shaft on three or more supports The equations of static equilibrium are insufficient to solve bearing reactions on a shaft having more than two supports Such cases can be solved using computer programs if adequate information is available In such problems the deflections of the shaft bearings and housings affect the distribution of loads Any variance in these parameters can significantly affect bearing reactions It can be demonstrated mathematically that if the shaft is modeled as being supported at its effective bearing center rather than at its geometric bearing center the bearing moment may be ignored when calculating radial loads on the bearing Only externally applied loads need to be considered and moments are taken about the effective centers of the bearings to determine bearing loads or reactions Fig A 9 shows single row bearings in a direct and indirect mounting configuration The choice of whether to use direct or indirect mounting depends upon the application and duty Fig A 9 Choice of mounting configuration for single row bearings showing position of effective load carrying centers Indirect mounting Tapered Roller Bearing Back to Back Angular Contact Ball Bearings Direct mounting Tapered Roller Bearing Face to Face Angular Contact Ball Bearings Effective bearing spread Indirect mounting Direct mounting Effective bearing spread Effective bearing spread Indirect mounting Direct mounting Effective bearing spread BeAring Reactions dynamic equivalent loads Bearing life Engineering A A28 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A29 A28 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A29 Fig A 10 Bearing radial reactions Vertical reaction component at bearing position B FrBv 1 c1 FsG cos 1 FtG sin 1 1 DpG b sin G FaG cos 1 c2 F cos 2 M cos 3 ae 2 Horizontal reaction component at bearing position B F rBh 1 c1 FsG sin 1 FtG cos 1 1 DpG b sin G FaG sin 1 c2 F sin 2 M sin 3 ae 2 Vertical reaction component at bearing position A FrAv FsG cos 1 FtG sin 1 F cos 2 FrBv Horizontal reaction component at bearing position A F rAh FsG sin 1 FtG cos 1 F sin 2 FrBh Resultant radial reaction F rA FrAv 2 FrAh 2 1 2 FrB FrBv 2 FrBh 2 1 2 Calculation equations Symbols Used ae Effective bearing spread mm in A B Bearing position used as subscripts c1 c2 Linear distance positive or negative mm in DpG Pitch diameter of the gear mm in F Applied force N lbf Fr Radial bearing load N lbf h Horizontal used as subscript M Moment N mm lbf in v Vertical used as subscript 1 Gear mesh angle relative to plane of reference defined in Figure A 10 degree 2 Angle of applied force relative to plane of reference defined in Figure A 10 degree 3 Angle of applied moment relative to plane of reference defined in Figure A 10 degree Bearing radial loads are determined by 1 Resolving forces applied to the shaft into horizontal and vertical components relative to a convenient reference plane 2 Taking moments about the opposite support 3 Combining the horizontal and vertical reactions at each support into one resultant load Shown are equations for the case of a shaft on two supports with gear forces Ft tangential Fs separating and Fa thrust an external radial load F and an external moment M The loads are applied at arbitrary angles 1 2 and 3 relative to the reference plane indicated in Fig A 10 Using the principle of superposition the equations for vertical and horizontal reactions Frv and Frh can be expanded to include any number of gears external forces or moments Use signs as determined from gear force equation Care should be used when doing this to ensure proper supporting degrees of freedom are used That is tapered roller bearings and ball bearings support radial loads moment loads and thrust loads in both directions Spherical roller bearings will not support a moment load but will support radial and thrust loads in both directions Cylindrical roller bearings support radial and moment loading but can only support slight thrust loads depending upon thrust flange configuration Finally needle roller bearings only support radial and moment loading BeAring Reactions dynamic equivalent loads Bearing life continued F tG F rAh F rAv c 1 c 2 a e F rBh F rBv F F sG F aG Bearing A Bearing B M F aG F sG F 1 3 2 F tG Plane of Reference Plane of Moment A28 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A29 Engineering A A28 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A29 BeAring Reactions dynamic equivalent loads Bearing life continued Equivalent dynamic radial bearing loads Pr To calculate the L10 life it is necessary to calculate a dynamic equivalent radial load designated by Pr The dynamic equivalent radial load is defined as a single radial load that if applied to the bearing will result in the same life as the combined loading under which the bearing operates Pr XFr Y1Fa Where Pr Dynamic Equivalent Radial Load Fr Applied Radial Load Fa Applied Axial Load X Radial Load Factor Y Axial Load Factor For spherical roller bearings the values for X and Y can be determined using the equations below Calculate the ratio of the axial load to the radial load Compare this ratio to the e value for the bearing In equation form Pr Fr Y2 Fa for Fa Fr e and Pr 0 67Fr Y2 Fa for Fa Fr e Note that values for e Y1 and Y2 are available in the bearing tables Needle roller bearings are designed to carry radial load with zero thrust load under normal conditions With the thrust load equal to zero equivalent radial load Pr is equal to the design radial load Fr Your Timken representative should be consulted on any applications where thrust load is involved as the resulting increase in internal friction may require cooling to prevent increased operating temperatures Tapered roller bearings use the equations based on the number of rows and type of mounting utilized For single row bearings in direct or indirect mounting the table on page A31 can be used based on the direction of the externally applied thrust load Once the appropriate design is chosen review the table and check the thrust condition to determine which thrust load and dynamic equivalent radial load calculations apply For cylindrical roller bearings with purely radial applied load P Fr kN Note The maximum dynamic radial load that may be applied to a cylindrical roller bearing should be C 3 If in addition to the radial load an axial load Fa acts on the bearing this axial load is taken into consideration when calculating the life of a bearing with Fa Faz Faz is the allowable axial load Dimension Load ratio Equivalent Series Dynamic Load 10 2 E 3 E F a Fr 0 11 P Fr Fa Fr 0 11 P 0 93 Fr 0 69 Fa 22 E 23 E Fa Fr 0 17 P Fr Fa Fr 0 17 P 0 93 Fr 0 45 Fa Engineering A A30 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A31 A30 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A31 BeAring Reactions dynamic equivalent loads Bearing life continued For ball bearings the dynamic equivalent radial load can be found in Table 3 The required Y factors are found in the Table 4 Bearing Contact Single Row Double Row Description ref Angle and Tandem and Preload Pair Mountings Mountings Bearing Type KT Fa KT Fa and or Series of bearings x Co Co Radial Type Ball Bearings Use larger of Resulting P Value M9300K MM9300K M9100K MM9100K 0 P Fr or P Fr 1 20Y1Fa or M200K MM200K P 0 56Fr Y1Fa P 0 78Fr 1 625Y1Fa M300K MM300K Small inch and Metric 9300 9100 200 300 0 P F r or and derivatives P 0 56Fr Y1Fa XLS Large Inch W and GW Tri Ply WIDE INNER RING BALL 0 P Fr or BEARINGS HOUSED UNITS P 0 56Fr Y1Fa ANGULAR CONTACT BALL BEARINGS Use larger of Resulting P Value 7200K 7200W 7300W 7400W P Fr P Fr 1 09Fa 5200K 5300W 20 or or 5311W 5318W P 0 43Fr Fa P 0 70Fr 1 63Fa 5218W 5220W 5407W 5221W 5214W 5200 5200W see 20 exceptions P Fr P Fr 0 78Fa 5300 5300W see 20 exceptions 30 or or 5400 5400W see 20 exceptions P 0 39Fr 0 76Fa P 0 63Fr 1 24Fa 7200WN P Fr P Fr 0 55Fa 7300WN 40 or or 7400WN P 0 35Fr 0 57Fa P 0 57Fr 0 93Fa 2M9300WI P Fr P Fr 1 124Y2Fa 2M9100WI 2MM9100WI 15 or or 2M200WI 2MM9100WI P 0 44Fr Y2Fa P 0 72Fr 1 625Y2Fa 2MM300WI 2MM9100WO P Fr P Fr 1 124Y3Fa or or P 0 44Fr Y3Fa P 0 72Fr 1 625Y3Fa 3M9300WI P Fr P Fr 0 92Fa 3M9100WI 3MM9100WI 25 or or 3M200WI 3MM200WI P 0 41Fr 0 87Fa P 0 67Fr 1 41Fa 3MM300WI Table 4 KT Y1 Y2 Y3 0 015 2 30 1 47 1 60 0 020 2 22 1 44 1 59 0 025 2 10 1 41 1 57 0 030 2 00 1 39 1 56 0 040 1 86 1 35 1 55 0 050 1 76 1 32 1 53 0 060 1 68 1 29 1 51 0 080 1 57 1 25 1 49 0 100 1 48 1 21 1 47 0 120 1 42 1 19 1 45 0 150 1 34 1 14 1 42 0 200 1 25 1 09 1 39 0 250 1 18 1 05 1 35 0 300 1 13 1 02 1 33 0 400 1 05 1 00 1 29 0 500 1 00 1 00 1 25 0 600 1 22 0 800 1 17 1 000 1 13 1 200 1 10 Equivalent Dynamic Thrust Bearing Loads Pa For thrust ball cylindrical and tapered roller bearings the existence of radial loads introduces complex load calculations that must be carefully considered If radial load is zero the equivalent dynamic thrust load Pa will be equal to the applied thrust load Fa If any radial load is expected in the application consult your Timken representative for advice on bearing selection For thrust angular contact ball bearings the equivalent dynamic thrust load is determined by Pa Xr F YFa The minimum permissible thrust load to radial load ratios Fa Fr and X and Y factors are listed in the bearing dimension tables in the thrust bearing section Thrust spherical roller bearing dynamic thrust loads are determined by Pa 1 2Fr Fa Radial load Fr of a thrust spherical roller bearing is proportional to the applied axial load Fa with Fr 0 55 Fa Because of the steep roller angle and the fact that the bearing is separable a radial load will induce a thrust component Fai 1 2 Fr that must be resisted by another thrust bearing on the shaft or by an axial load greater than Fai Table 3 Note If P C0 or P 1 2 CE consult with your Timken representative on Life Calculations A30 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A31 Engineering A A30 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A31 BeAring Reactions dynamic equivalent loads Bearing life continued Bearing equivalent loads and requireD ratings for tapered roller bearings Tapered roller bearings are ideally suited to carry all types of loadings radial thrust and any combination of both Due to the tapered design of the bearing a radial load will induce a thrust reaction within the bearing which must be opposed by an equal or greater thrust load in order to keep the bearing cone and cup from separating The ratio of the radial to the thrust load and the bearing included cup angle determine the load zone in a given bearing The number of rollers in contact as a result of this ratio determines the load zone in the bearing If all the rollers are in contact the load zone is referred to as being 360 degrees When only radial load is applied to a tapered roller bearing for convenience it is assumed in using the traditional calculation method that half the rollers support the load the load zone is 180 degrees In this case induced bearing thrust is The equations for determining bearing thrust reactions and equivalent radial loads in a system of two single row bearings are based on the assumption of a 180 degree load zone in one of the bearings and 180 degrees or more in the opposite bearing Fa 180 0 47 Fr K Dynamic Equivalent Radial Load The basic dynamic radial load rating C90 is assumed to be the radial load carrying capacity with a 180 degree load zone in the bearing When the thrust load on a bearing exceeds the induced thrust Fa 180 a dynamic equivalent radial load must be used to calculate bearing life The dynamic equivalent radial load is that radial load which if applied to a bearing will give the same life as the bearing will attain under the actual loading The equations presented give close approximations of the dynamic equivalent radial load assuming a 180 degree load zone in one bearing and 180 degrees or more in the opposite bearing Tapered roller bearings use the equations based on the number of rows and type of mounting utilized For single row bearings in direct or indirect mounting the following table can be used based on the direction of the externally applied thrust load Once the appropriate design is chosen review the table and check the thrust condition to determine which thrust load and dynamic equivalent radial load calculations apply Single Row Mounting To use this table for a single row mounting determine if bearings are direct or indirect mounted and to which bearing A or B thrust Fae is applied Once the appropriate design is established follow across the page opposite that design and check to determine which thrust load and dynamic equivalent radial load equations apply Engineering A A32 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A33 A32 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A33 BeAring Reactions dynamic equivalent loads Bearing life continued Note FrAB is the radial load on the two row assembly The single row basic dynamic radial load rating C90 is to be applied when calculating life based on the above equations Two Row Mounting Fixed or Floating With No External Thrust Fae 0 Similar Bearing Series For double row tapered roller bearings the following table can be used In this table only bearing A has an applied thrust load If bearing B has the applied thrust load the A s in the equations should be replaced by B s and vice versa For two row similar bearing series with no external thrust Fae 0 the dynamic equivalent radial load P equals FrAB or FrC Since FrAB or Frc is the radial load on the two row assembly the two row basic dynamic radial loads rating C90 2 is to be used to calculate bearing life A32 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A33 Engineering A A32 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A33 BeAring Reactions dynamic equivalent loads Bearing life continued 1 SINGLE ROW MOUNTING 2 TWO ROW MOUNTING FIXED BEARING WITH EXTERNAL THRUST Fae SIMILAR OR DISSIMILAR SERIES Note FrAB is the radial load on the two row assembly The single row basic dynamic radial load rating C90 is to be applied when calculating life based on the above equations Note If PA FrA use PA FrA or if PB FrB use PB FrB Optional approach for determining dynamic equivalent radial loads The following is a general approach to determining the dynamic equivalent radial loads Here a factor m has to be defined as 1 for direct mounted single row or two row bearings or 1 for indirect mounted bearings Also a sign convention is necessary for the external thrust Fae as follows a In case of external thrust applied to the shaft typical rotating cone application Fae to the right is positive to the left is negative b When external thrust is applied to the housing typical rotating cup application Fae to the right is negative to the left is positive Engineering A A34 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A35 A34 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A35 MINIMUM BEARING LOAD Slippage can occur if loads are too light and if accompanied by inadequate lubrication cause damage to the bearings The minimum load for radial cylindrical spherical and full complement needle roller bearings is P C 0 04 P is the dynamic load and C is the basic dynamic load rating Thrust needle roller bearings also have an added design requirement such that the minimum thrust load is satisfied to prevent the rollers from skidding on the raceway The equation for the thrust loading force is different for needle rollers versus cylindrical rollers as noted needle rollers Fa min C0 2200 kN cylindrical rollers Fa min 0 1C0 2200 kN Centrifugal force in thrust spherical roller bearings tends to propel the rollers outward The bearing geometry converts this force to another induced thrust component which must be overcome by an axial load This induced thrust Fac is given by Fac kn 2 x 10 5 lbf The minimum required working thrust load on a thrust spherical roller bearing Fa min is then computed by Fa min 1 2 Fr Fac C0a 1000 lbf In addition to meeting the above calculated value the minimum required working thrust load Fa min should be equal to or greater than 0 1 percent of the static thrust load rating C0a Hardness Factors to Modify Basic Static Load Rating Raceway Hardness Hardness HRC Factor HFs 58 1 00 57 1 06 56 1 13 55 1 21 54 1 29 53 1 37 52 1 46 51 1 55 50 1 65 49 1 76 48 1 88 47 2 00 46 2 13 45 2 27 44 2 41 43 2 57 42 2 74 41 2 92 40 3 10 BeAring Reactions dynamic equivalent loads Bearing life continued When the loading is static it is usually suggested that the applied load be no greater than the basic static load rating divided by the appropriate factor HFs as shown in the table below Cylindrical roller bearing maximum Allowable axial load Metric series cylindrical roller bearings of NUP NP NF as well as NU or NJ designs with a thrust collar can transmit axial loads if they are radially loaded at the same time The allowable axial load ratio Fa C of 0 1 maximum depends to a great extent on the magnitude of radial load the operating speed type of lubricant used the operating temperature and heat transfer conditions at the bearing location The heat balance achieved at the bearing location is used as a basis for determination of the allowable axial load The nomogram on page A35 should be used to determine the allowable axial load Faz based on the following operating conditions The axial load is of constant direction and magnitude Radial load ratio Fr C 0 2 Ratio of axial load to radial load Fa Fr 0 4 The temperature of the bearing is 80 C 176 F at an ambient temperature of 20 C 68 F Lubricating oil is ISO VG 100 or greater using oil bath lubrication or circulating oil As an alternative the bearing may be lubricated with a grease using the above specified base oil and viscosity Use of EP additives will be necessary although considerably shorter relubrication intervals may be expected than with purely radially loaded radial cylindrical roller bearings Example of using the nomogram From the lower part of the nomogram determine the intersection point of the inner ring bore diameter and the dimension series of the bearing From the upper part the allowable axial load ratio Faz C can be found as a function of the operating speed n For a cylindrical roller radial bearing NU2207E TVP C 63 kN d 35 mm n 2000 RPM Fr 10 kN From the nomogram Faz C 0 06 Then Faz 0 06 63 The calculated allowable axial load Faz is 3 78 kN It should be noted that an axial load as high as that determined by means of the nomogram should not be applied if an oil of rated kinematic viscosity lower than ISO VG 100 is used Suitable EP additives which are known for fatigue life improving qualities may allow for an increase in applied axial load subject to thorough testing Higher applied axial loads Axial loads greater than those determined by means of the nomogram may be considered providing they are to be applied intermittently Also the bearing should be cooled using circulating oil lubrication and if the operating temperature due to the internal friction and the higher axial load exceeds 80 C 176 F a more viscous oil must be used A34 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A35 Engineering A A34 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A35 BeAring Reactions dynamic equivalent loads Bearing life continued The basic dynamic load rating and the static load rating are commonly used for bearing selection The basic dynamic load rating is used to estimate life of a rotating bearing Static load ratings are used to determine the maximum permissible load that can be applied to a non rotating bearing The basic philosophy of The Timken Company is to provide the most realistic bearing rating to assist our customers in the bearing selection process Published ratings for Timken bearings include the basic dynamic radial load rating C This value is based on a basic rating life of one million revolutions Timken tapered roller bearings also include the basic dynamic load rating C90 which is based on rating life of ninety million revolutions The basic static radial load rating is Co Static load rating The basic static radial load rating and thrust load rating for Timken bearings are based on a maximum contact stress within a non rotating bearing of 4000 MPa 580 ksi for roller bearings and 4200 MPa 607 ksi for ball bearings at the center of contact on the most heavily loaded rolling element The 4000 MPa 580 ksi or 4200 MPa 607 ksi stress levels may cause visible light brinell marks on the bearing raceways This degree of marking will not have a measurable effect on fatigue life when the bearing is subsequently rotating under a lower application load If sound vibration or torque are critical or if a pronounced shock load is present a lower load limit should be applied For more information on selecting a bearing for static load conditions consult your Timken representative Engineering A A36 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A37 A36 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A37 BeAring Reactions dynamic equivalent loads Bearing life continued Radial ball bearings The dynamic equivalent radial load is used for comparison with the static load rating Refer to the Dynamic Equivalent Radial and or Axial Loads section Thrust ball bearings Similar to radial ball bearings thrust ball bearings use the same equation for equivalent static and dynamic loading P0a X Fr Y Fa The X and Y factors are listed in the bearing tables along with the minimum required thrust load to radial load ratio for maintaining proper operation Radial spherical roller bearings The load factors X0 and Y0 which are listed in the bearing tables are used with the following equation to estimate the static radial equivalent load P0r X0 Fr Y0 Fa For ball bearings 0 4200 P 0 1 3 MPa C 0 0 607 P 0 1 3 ksi C 0 0 4000 P 0 1 2 MPa C 0 0 580 P 0 1 2 ksi C 0 Static Radial and or Axial Equivalent Loads The static equivalent radial and or axial loading is dependent on the bearing type selected For bearings designed to accommodate only radial or thrust loading the static equivalent load is equivalent to the applied load For all bearings the maximum contact stress can be approximated using the static equivalent load and the static rating For roller bearings Thrust spherical roller bearings The following equation is used for thrust spherical roller bearings P0a Fa 2 7 Fr Thrust spherical roller bearings require a minimum thrust load for proper operation Poa should not be greater than 0 5 Coa If conditions exceed this consult your Timken representative Tapered roller bearings To determine the static equivalent radial load for a single row mounting first determine the thrust load Fa then use the equations in this section depending on the appropriate thrust load condition Needle roller bearings Because radial needle roller bearings are not designed to accept thrust loading their equation to determine static radial equivalent load is P0r Fr Thrust needle roller bearings are not designed to accept radial loading so their equation to determine static thrust equivalent load is P0a Fa Static equivalent radial load two row bearings The bearing data tables do not include static rating for two row bearings The two row static radial rating can be estimated as Co 2 2Co where Co 2 two row static radial rating Co static radial load rating of a single row bearing type TS from the same series Please refer to illustrations on page A169 where Fr applied radial load Fa net bearing thrust load FaA and FaB calculated from equations Note Use the values of Po calculated for comparison with the static rating Co even if Po is less than the radial applied Fr Thrust Condition 0 47 F rA 0 47 F rB F ae K A K B 0 47 F rA 0 47 F rB F ae K A K B Net Bearing Thrust Load F aA 0 47 F rB F ae K B F aB 0 47 F rB K B F aA 0 47 F rA K A F aB 0 47 F rA F ae K A Static Equivalent Radial Load P 0 Bearing A F rA F ae F rB Bearing B FrA F ae F rB Bearing A Bearing B Design external thrust F ae onto bearing A P 0B F rB for F aA 0 6 F rA K A P 0A 1 6 F rA 1 269 K AF aA for F aA 0 6 F rA K A P 0A 0 5 F rA 0 564 K AF aA for F aB 0 6 F rB K B P 0B 0 5 F rB 0 564 K BF aB for F aB 0 6 F rB K B P 0B 1 6 F rB 1 269 K B F aB P 0A F rA A36 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A37 Engineering A A36 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A37 BeAring Reactions dynamic equivalent loads Bearing life continued Bearing Life Many different performance criteria exist that dictate how a bearing should be selected These include bearing fatigue life rotational precision power requirements temperature limits speed capabilities sound etc This publication deals primarily with bearing life as related to material associated fatigue Bearing life is defined here as the length of time or number of revolutions until a fatigue spall of 6 mm 2 0 01 in 2 develops Since metal fatigue is a statistical phenomenon the life of an individual bearing is impossible to precisely predetermine Bearings that may appear to be identical can exhibit considerable life scatter when tested under identical conditions Thus it is necessary to base life predictions on a statistical evaluation of a large number of bearings operating under similar conditions The Weibull distribution function is commonly used to predict the life of a population of bearings at any given reliability level Rating Life Rating life L10 is the life that 90 percent of a group of apparently identical bearings will complete or exceed before a fatigue spall develops The L10 life also is associated with 90 percent reliability for a single bearing under a certain load Bearing Life Equations Traditionally the L10 life has been calculated as follows for bearings under radial or combined loading where the dynamic equivalent radial load Pr has been determined L10 C e 1x10 6 revolutions Pr or L10 C e 1x10 6 hours Pr 60n For thrust bearings the above equations change to the following L10 Ca e 1x10 6 revolutions Pa or L10 Ca e 1x10 6 hours Pa 60n e 3 for ball bearings 10 3 for roller bearings Tapered roller bearings often use a dynamic load rating based on ninety million cycles as opposed to one million cycles changing the equations as follows As the first set of equations for radial bearings with dynamic ratings based on one million revolutions is the most common form of the equations this will be used through the rest of this section The equivalent dynamic load equations and the life adjustment factors are applicable to all forms of the life equation With increased emphasis on the relationship between the reference conditions and the actual environment in which the bearing operates in the machine the traditional life equations have been expanded to include certain additional variables that affect bearing performance The approach whereby these factors including a factor for useful life are considered in the bearing analysis and selection has been termed Bearing Systems Analysis BSA The ISO ABMA expanded bearing life equation is L10a a 1 a 2 a 3 L10 Where a 1 Reliability Life Factor a 2 Material Life Factor a 3 Operating Condition Life Factor to be specified by the manufacturer The Timken expanded bearing life equation is L10a a 1 a 2 a 3d a 3h a 3k a 3l a 3m a 3p C e 1x10 6 Fr Where a 1 Reliability Life Factor a 2 Material Life Factor a 3d Debris Life Factor a 3h Hardness Life Factor a 3k Load Zone Life Factor a 3l Lubrication Life Factor a 3m Misalignment Life Factor a 3p Low Load Life Factor L10 C90 10 3 90x10 6 revolutions Pr or L10 C90 10 3 90x10 6 hours Pr 60n and L10 C90a 10 3 90x10 6 revolutions Pa or L10 C90a 10 3 90x10 6 hours Pa 60n Engineering A A38 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A39 A38 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A39 BeAring Reactions dynamic equivalent loads Bearing life continued Reliability Life Factor a1 The equation for the life adjustment factor for reliability is a1 4 26 ln 100 2 3 0 05 R ln natural logarithm base e To adjust the calculated L10 life for reliability multiply by the a1 factor If 90 90 percent reliability is substituted for R in the above equation a1 1 For R 99 99 percent reliability a1 0 25 The following table lists the reliability factor for commonly used reliability values Note that the equation for reliability adjustment assumes there is a short minimum life below which the probability of bearing damage is minimal e g zero probability of bearing damage producing a short life Extensive bearing fatigue life testing has shown the minimum life below which the probability of bearing damage is negligible to be larger than shown above For a more accurate prediction of bearing lives at high levels of reliability consult your Timken representative Material Life Factor a2 The life adjustment factor for bearing material a2 for standard Timken bearings manufactured from bearing quality steel is 1 0 Bearings also are manufactured from premium steels containing fewer and smaller inclusion impurities than standard steels and providing the benefit of extending bearing fatigue life e g DuraSpexx Application of the material life factor requires that fatigue life is limited by nonmetallic inclusions that contact stresses are approximately less than 2400 MPa 350 ksi and adequate lubrication is provided It is important to note that improvements in material cannot offset poor lubrication in an operating bearing system Consult your Timken representative for applicability of the material factor R percent Ln a1 90 L10 1 00 95 L5 0 64 96 L4 0 55 97 L3 0 47 98 L2 0 37 99 L1 0 25 99 5 L0 5 0 175 99 9 L0 1 0 093 Debris Life Factor a3d Debris within a lubrication system reduces the life of a roller bearing by creating indentations on the contacting surfaces leading to stress risers The Timken life rating equations were developed based on test data obtained with 40 m oil filtration and measured ISO cleanliness levels of approximately 15 12 which is typical of cleanliness levels found in normal industrial machinery When more or less debris is present within the system the fatigue life predictions can be adjusted according to the measured or expected ISO lubricant cleanliness level to more accurately reflect the expected bearing performance As opposed to determining the debris life factor based on filtration and ISO cleanliness levels a Debris Signature Analysis can be performed for more accurate bearing performance predictions The Debris Signature Analysis is a process for determining the effects of the actual debris present in your system on the bearing performance The typical way in which this occurs is through measurements of dented bruised surfaces on actual bearings run in a given application This type of analysis can be beneficial because different types of debris cause differing levels of performance even when they are of the same size and amount in the lubricant Soft ductile particles can cause less performance degradation than hard brittle particles Hard ductile particles are typically most detrimental to bearing life Brittle particles can break down thus not affecting performance to as large of a degree as hard ductile particles For more information on Debris Signature Analysis or the availability of Debris Resistant bearings for your application consult your Timken representative Surface map of a bearing raceway with debris denting A38 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A39 Engineering A A38 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A39 Hardness Life Factor a3h Both the dynamic and static load ratings of Timken bearings are based on a minimum raceway hardness equivalent to 58 on the Rockwell C scale HRc ASTM E 18 If the raceway hardness must be decreased these load ratings also will be decreased For Timken bearings supplied as a full assembly the hardness life factor will be unity For bearing applications designed to use the shaft or housing surfaces as raceways this factor can be used to estimate performance when the required 58 HRc minimum hardness cannot be achieved The effective raceway hardness affects the life of a bearing application as shown in the following table If values for raceway hardness below 45 HRc are required consult your Timken representative Load Zone Life Factor a3k The fatigue life of a bearing is a function of the stresses in rollers and raceways and the number of stress cycles that the loaded bearing surfaces experience in one bearing revolution The stresses depend on applied load and on how many rollers support that load The number of stress cycles depends on bearing geometry and again on how many rollers support the load Therefore life for a given external load is related to the loaded arc or load zone of the bearing The load zone in a bearing is dominated by the internal clearance either radial or axial depending on the bearing type Neglecting preload less clearance in a bearing results in a larger load zone and subsequently longer bearing life Using the dynamic equivalent load Pr instead of the applied radial load Fr in the equation for L10a roughly approximates the load zone factor for combined loading only If a more accurate assessment of the load zone adjusted life is necessary e g including the effects of internal clearance or fitting practice consult your Timken representative Bearing Load Zones and Roller Raceway Contact Loading Lubrication Life Factor a3l The influence of lubrication film due to elastohydrodynamic EHL lubrication on bearing performance is related to the reduction or prevention of asperity metal metal contact between the bearing surfaces Extensive testing has been done at Timken Research to quantify the effects of the lubrication related parameters on bearing life It has been found that the roller and raceway surface finish relative to lubricant film thickness has the most notable effect on improving bearing performance Factors such as bearing geometry material loads and load zones also play an important role in bearing performance The following equation provides a method to calculate the lubrication factor for a more accurate prediction of the influence of lubrication on bearing life L10a a 3l C g C l C j C s C v C gr Where Cg geometry factor Cl load factor Cj load zone factor Cs speed factor Cv viscosity factor Cgr grease lubrication factor Note The a3l maximum is 2 88 for all bearings The a3l minimum is 0 200 for case carburized bearings and 0 126 for through hardened bearings A lubricant contamination factor is not included in the lubrication factor because Timken endurance tests are typically run with a 40 m filter to provide a realistic level of lubricant cleanness for most applications Geometry factor Cg Cg is given for most part numbers in the bearing tables The geometry factor also includes the material effects and load zone considerations for non tapered roller bearings as these also are inherent to the bearing design However it should be noted that the primary effect of the load zone is on roller load distributions and contact stresses within the bearing which are not quantified within the lubrication factor Refer to the previous section Load Zone Life Factor a3k for more information Note that the geometry factor Cg factor is not applicable to our DuraSpexx product For more information on our DuraSpexx product consult your Timken representative Raceway Hardness HRc a3h 58 1 00 57 0 81 56 0 66 55 0 53 54 0 43 53 0 35 52 0 28 51 0 22 50 0 18 49 0 14 48 0 11 47 0 09 46 0 07 45 0 06 BeAring Reactions dynamic equivalent loads Bearing life continued Engineering A A40 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A41 A40 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A41 Viscosity factor Cv The lubricant kinematic viscosity centistokes cSt is taken at the operating temperature of the bearing The operating viscosity can be estimated by using the figure in the Speed Heat and Torque section The viscosity factor Cv can then be determined from the following figure Viscosity Factor C v vs Kinematic Viscosity Grease lubrication factor Cgr For grease lubrication the EHL lubrication film becomes depleted of oil over time and is reduced in thickness Consequently a reduction factor Cgr should be used to adjust for this effect Cgr 0 79 Misalignment life factor a3m The effect of bearing life depends on the magnitude of the angle of misalignment on the internal bearing geometry and on the applied loads The misalignment life factor for spherical bearings is equal to one a3m 1 due to the self aligning capabilities of a spherical roller bearing The allowable misalignment in a spherical roller bearing is between 1 degree and 2 5 degrees depending upon the series of the bearing as detailed in the following table Life will be reduced if these limits are exceeded due to roller raceway contact truncation BeAring Reactions dynamic equivalent loads Bearing life continued Load factor Cl The Cl factor is obtained from the following figure Note that the factor is different based on the type of bearing utilized Pr is the equivalent load applied to the bearing in Newtons and is determined in the Equivalent Bearing Loads Pr section Load Factor C l vs Equivalent Bearing Load P r Load zone factor Cj As mentioned previously for all non tapered roller bearings the load zone factor is unity For tapered roller bearings the load zone factor can be taken from the graph based on the thrust load applied to that bearing Load Zone Factor C j vs Tapered Bearing Thrust Load F a Speed factor Cs Cs is determined from the following figure where rev min RPM is the rotational speed of the inner ring relative to the outer ring Speed Factor C s vs Rotational Speed Bearing Series Maximum Misalignment 238 1 0 222 230 231 239 249 1 5 223 240 2 0 232 241 2 5 Maximum Permissible Misalignments for Spherical Roller Bearings Based on Series 1 0 9 0 8 0 7 0 6 0 5 0 0 5 1 1 5 2 2 5 747 Fr Fa K C j 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 0 0 1 10 100 1000 10000 100000 1000000 10000000 Pr newtons Fa for single row tapered roller bearings C l Spherical Roller Ball Bearings Tapered Needle Cylindrical Roller Bearings Spherical Roller Ball Bearings Tapered Needle Cylindrical Roller Bearings Rotational Speed RPM 1000 100 10 1 1 10 100 1000 10000 C s 100 10 1 10 100 1000 10000 Kinematic Viscosity cSt C v SphericalRoller BallBearings Tapered Needle CylindricalRollerBearings 10000 A40 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A41 Engineering A A40 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A41 Needle rollers with relieved ends Needle roller bearing life is affected by the distribution of contact stress between roller and raceways Even when non profiled needle rollers are loaded under conditions of ideal alignment the contact stress is not uniform along the length of the rollers but rather is concentrated towards the ends Misalignment causes even greater roller contact stress This effect is illustrated below Needle Roller Cylindrical Needle Roller Relieved Ends exaggerated for clarity The use of needle rollers with relieved ends helps to reduce stress concentration at the ends of rollers both under misalignment or ideal alignment and results in more uniform stress distribution and optimum bearings performance Low load life factor a3p Bearing life tests at the Timken Technology Center have shown greatly extended bearing fatigue life performance is achievable when the bearing contact stresses are low and the lubricant film is sufficient to fully separate the micro scale textures of the contacting surfaces Mating the test data with sophisticated computer programs for predicting bearing performance Timken engineers have developed a low load factor for use in the catalog to predict the life increase expected when operating under low bearing loads The following figure shows the low load factor a3p as a function of the lubricant life factor a3l and the ratio of bearing dynamic rating to the bearing equivalent load BeAring Reactions dynamic equivalent loads Bearing life continued For all other bearing types accurate alignment of the shaft relative to the housing is critical for best performance The life prediction using the method defined in this publication is relatively accurate up to the limits listed within based on bearing type The base condition for which the load rating of the roller bearings are defined is 0 0005 radians misalignment For cylindrical roller bearings the misalignment factor also is a measure of the effect of bearing axial load on life Axial loading of the bearing causes a moment to be generated about the roller center thus shifting the roller raceway contact stresses toward the end of the roller similar to bearing misalignment Performance of all Timken bearings under various levels of misalignment radial and axial load can be predicted using sophisticated computer programs Using these programs Timken engineers can design special bearing contact profiles to accommodate the conditions of radial load axial load and or bearing misalignment in your application Consult your Timken representative for more information For needle roller bearings the following table gives the misalignment limitations based on bearing width Bearing Width Maximum Slope mm inches Caged Full Complement 50 2 0 0005 0 0005 25 50 1 2 0 0010 0 0005 25 1 0 0015 0 0010 Roller inner raceway contact stress with high misalignment and special profile Roller inner raceway contact stress without misalignment Load Load Life Adjustment Factor for Dynamic Ratings based on 90x10 Revolutions 0 5 1 1 5 2 2 5 3 3 5 4 4 5 5 5 5 6 6 5 0 0 5 1 1 5 2 2 5 3 a 3l a 3 p a 3P a3L 6 5 6 5 5 5 4 5 4 3 5 3 2 5 2 1 5 1 0 5 0 0 5 1 1 5 2 2 5 3 Low Load Factor a3p vs Lubricant Life Factor a3l and C90 Pr Ratio C90 Pr 3 50 C90 Pr 2 50C90 Pr 2 00 C90 Pr 1 75 C90 Pr 1 33 C90 Pr 1 10 C90 Pr 90 C90 Pr 1 50 C90 Pr 1 25 C90 Pr 1 00 C90 Pr 80 Fig A 11 Comparative Stress Patterns Engineering A A42 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A43 A42 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A43 LIFE THRUST SPHERICAL CYLINDRICAL AND TAPERED ROLLER BEARINGS The life formula below is the radial roller bearing life equation restated in terms of thrust instead of radial ratings and radial equivalent loads L10 16667 Ct 10 3 Hours n Te The calculations of bearing life may also be performed by using logarithmic factors for rotational speed Nf and life Lf based on the formula L10 500 Lf 10 3 Hours where Lf Ct nf Te where Nf 1 3 10 03n Referring back to the above equation it may be advisable as previously noted with radial bearings under certain operating conditions to include an application factor a3 and calculate life according to the formula L10 16667 a3 Ct 10 3 or L10 500 a3 Lf 10 3 Hours n Te a3 is the factor based on application conditions Under optimum conditions a3 1 Depending on lubricant contamination temperatures impact loading and load reversals a3 may be less than 1 and as low as 0 05 Consult your Timken representative for assistance with your specific application requirements LIFE THRUST ball BEARINGS L10 16667 Ct 3 Hours n Te It may be advisable under certain operating conditions to include an application factor a3 and calculate life according to the formula L10 16667 a3 Ct 3 Hours n Te a3 the life factor based on application conditions can be assigned values as described above BeAring Reactions dynamic equivalent loads Bearing life continued A42 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A43 Engineering A A42 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A43 The tolerances in this table are in conformance with ANSI ABMA Standard 20 1987 ABMA ISO Symbols Inner Ring dmp Single plane mean bore diameter deviation from basic bore diameter e g bore tolerance for a basically tapered bore dmp refers only to the theoretical small bore end of the bore Kia Radial runout of assembled bearing inner ring e g radial runout of raceway VBs Inner ring width variation e g parallelism Sd Inner ring reference face runout with bore e g squareness bore to face Sia Axial runout of assembled bearing inner ring e g lateral axial runout of raceway Bs Single inner ring width deviation from basic e g width tolerance ABMA ISO Symbols Outer Ring Dmp Single plane mean outside diameter deviation from basic outside diameter e g O D tolerance Kea Radial runout of assembled bearing outer ring e g radial runout of raceway VCs Outer ring width variation e g parallelism SD Outside cylindrical surface runout with outer ring reference face e g squareness O D to face Sea Axial runout of assembled bearing outer ring e g lateral axial runout of raceway Cs Outer ring width deviation from basic e g width tolerance tolerances Standards defining practices for ball and roller bearing usage are listed in the following tables These standards are provided for use in selecting bearings for general applications in conjunction with the bearing mounting and fitting practices offered in later sections Standard ABEC RBEC Tolerances Inner Ring All tolerances in number of micrometers m and ten thousandths inch 0001 Bearing Bore Bore Width Raceway Face Raceway Width Bore Numbers Diameter Variation Radial Runout Runout Axial Inner Reference dmp With Bore Runout Outer Rings 0 000 mm VBs Kia Sd S ia Bs Cs 0 0000 0 000 mm 0 0000 ABEC ABEC ABEC ABEC ABEC ABEC mm RBEC RBEC RBEC RBEC RBEC RBEC over incl 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 5 7 9 5 7 9 1 3 5 7 9 mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in in in in in in in in in in in in in in 8 7 5 4 2 5 15 15 5 2 5 1 5 10 6 4 2 5 1 5 7 3 1 5 7 3 1 5 120 40 2 5 10 30 39 3 3 2 1 5 1 6 6 2 1 0 5 4 2 5 1 5 1 0 5 3 1 0 5 3 1 0 5 50 15 8 7 5 4 2 5 20 20 5 2 5 1 5 10 7 4 2 5 1 5 7 3 1 5 7 3 1 5 120 80 10 18 00 03 3 3 2 1 5 1 8 8 2 1 0 5 4 3 1 5 1 0 5 3 1 0 5 3 1 0 5 50 30 10 8 6 5 2 5 20 20 5 2 5 1 5 13 8 4 3 2 5 8 4 1 5 8 4 2 5 120 120 18 30 04 06 4 3 2 5 2 1 8 8 2 1 0 5 5 3 1 5 1 1 3 1 5 0 5 3 1 5 1 50 50 12 10 8 6 2 5 20 20 5 3 1 5 15 10 5 4 2 5 8 4 1 5 8 4 2 5 120 120 30 50 07 10 4 5 4 3 2 5 1 8 8 2 1 0 5 6 4 2 1 5 1 3 1 5 0 5 3 1 5 1 50 50 15 12 9 7 4 25 25 6 4 1 5 20 10 5 4 2 5 8 5 1 5 8 5 2 5 150 150 50 80 11 16 6 4 5 3 5 3 1 5 10 10 2 5 1 5 0 5 8 4 2 1 5 1 3 2 0 5 3 2 1 60 60 20 15 10 8 5 25 25 7 4 2 5 25 13 6 5 2 5 9 5 2 5 9 5 2 5 200 200 80 120 17 24 8 6 4 3 2 10 10 3 1 5 1 10 5 2 5 2 1 3 5 2 1 3 5 2 1 80 80 25 18 13 10 7 30 30 8 5 2 5 30 18 8 6 2 5 10 6 2 5 10 7 2 5 250 250 120 150 26 30 10 7 5 4 3 12 12 3 2 1 12 7 3 2 5 1 4 2 5 1 4 3 1 100 100 25 18 13 10 7 30 30 8 5 4 30 18 8 6 5 10 6 4 10 7 5 250 250 150 180 32 36 10 7 5 4 3 12 12 3 2 1 5 12 7 3 2 5 2 4 2 5 1 5 4 3 2 100 100 30 22 15 12 8 30 30 10 6 5 40 20 10 8 5 11 7 5 13 8 5 300 300 180 250 38 50 12 8 5 6 4 5 3 12 12 4 2 5 2 16 8 4 3 2 4 5 3 2 5 3 2 120 120 35 25 18 35 35 13 50 25 13 13 15 350 350 250 315 52 60 14 10 7 14 14 5 20 10 5 5 6 140 140 40 30 23 40 40 15 60 30 15 15 20 400 400 315 400 64 80 16 12 9 16 16 6 24 12 6 6 8 160 160 45 35 50 45 65 35 450 400 500 18 14 20 18 26 14 180 50 40 60 50 70 40 500 500 630 20 16 24 20 28 16 200 75 70 80 750 630 800 30 28 31 300 Radial ball spherical and cylindrical roller bearings Depending on your specific application requirements various degrees of bearing accuracy may be required Timken maintains ball diameter and sphericity tolerances close control of race contours and internal clearances accuracy of cage construction and unusually fine surface finishes BEARING TOLERANCES INCH METRIC Engineering A A44 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A45 A44 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A45 Standard ABEC RBEC Tolerances Outer Ring All tolerances in number of micrometers m and ten thousandths inches 0001 Bearing Ball Outside Width Raceway Raceway Outside O D Bearing Diameter 1 Variation Radial Runout Axial Diameter Sizes Dmp Runout With Face 0 000 mm V Cs Kea S ea SD 0 0000 ABEC ABEC ABEC ABEC ABEC mm RBEC RBEC RBEC RBEC RBEC over incl 1 3 5 7 9 1 3 5 7 9 1 3 5 7 9 5 7 9 5 7 9 mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in in in in in in in in in in in 8 7 5 4 2 5 15 5 2 5 1 5 15 8 5 3 1 5 8 5 1 5 8 4 1 5 0 18 30 39 3 3 2 1 5 1 6 2 1 0 5 6 4 2 1 0 5 3 2 0 5 3 1 5 0 5 9300 9303 9 8 6 5 4 20 5 2 5 1 5 15 9 6 4 2 5 8 5 2 5 8 4 1 5 18 30 9100 9101 200 3 5 3 2 5 2 1 5 8 2 1 0 5 6 4 2 5 1 5 1 3 2 1 3 1 5 0 5 200 204 11 9 7 6 20 5 2 5 1 5 20 10 7 5 2 5 8 5 2 5 8 4 1 5 9304 9306 30 50 9102 9105 4 5 3 5 3 2 5 1 5 8 2 1 0 5 8 4 3 2 1 3 2 1 3 1 5 0 5 300 303 205 208 13 11 9 7 4 25 6 3 1 5 25 13 8 5 4 10 5 4 8 4 1 5 9307 9312 50 80 9106 9110 5 4 5 3 5 3 1 5 10 2 5 1 0 5 10 5 3 2 1 5 4 2 1 5 3 1 5 0 5 304 307 209 213 15 13 10 8 5 25 8 4 2 5 35 18 10 6 5 11 6 5 9 5 2 5 9313 9317 80 120 9111 9115 6 5 4 3 2 10 3 1 5 1 14 7 4 2 5 2 4 5 2 5 2 3 5 2 1 308 311 214 217 18 15 11 9 5 30 8 5 2 5 40 20 11 7 5 13 7 5 10 5 2 5 9318 9322 120 150 9116 9120 7 6 4 5 3 5 2 12 3 2 1 16 8 4 5 3 2 5 3 2 4 2 1 312 314 218 220 25 18 13 10 7 30 8 5 2 5 45 23 13 8 5 14 8 5 10 5 2 5 9323 9326 150 180 9121 9326 10 7 5 4 3 12 3 2 1 18 9 5 3 2 5 5 3 2 4 2 1 315 317 318 322 30 20 15 11 8 30 10 7 4 50 25 15 10 7 15 10 7 11 7 4 180 250 9126 9132 220 228 12 8 6 4 5 3 12 4 3 1 5 20 10 6 4 3 6 4 3 4 5 3 1 5 324 328 35 25 18 13 8 35 11 7 5 60 30 18 11 7 18 10 7 13 8 5 250 315 9134 9140 230 234 14 10 7 5 3 14 4 5 3 2 24 12 7 4 5 3 7 4 3 5 3 2 330 338 40 28 20 15 10 40 13 8 7 70 35 20 13 8 20 13 8 13 10 7 315 400 9144 9152 236 244 16 11 8 6 4 16 5 3 3 28 14 8 5 3 8 5 3 5 4 3 340 348 45 33 23 45 15 80 40 23 23 15 400 500 9156 9164 246 256 18 13 9 18 6 31 16 9 9 6 352 356 50 38 28 50 18 100 50 25 25 18 500 630 9180 260 264 20 15 11 20 7 39 20 10 10 7 630 800 75 45 35 20 120 60 30 30 20 30 18 14 8 47 24 12 12 8 800 1000 100 60 140 75 40 24 55 30 1000 1250 125 160 50 63 The tolerances in this table are in conformance with ANSI ABMA Standard 20 1987 1 Dmin the smallest single diameter of an O D and Dmax the largest single diameter of an O D may fall outside limits shown Dmin Dmax must be within outside diameter tabulated 2 For further details see ABMA Standard 20 These standards coupled with proprietary design material and processing specifications ensure that our bearings offer the maximum performance BeAring TOLERANCES INCH METRIC continued Among the tolerance classes ABEC 1 applies to ball bearings for normal usage The other classes ABEC 3 5 7 9 apply to ball bearings of increased precision as required RBEC 1 applies to roller bearings for normal usage RBEC 3 and 5 apply to roller bearings of increased precision as required A44 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A45 Engineering A A44 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A45 Tolerances of cylindrical roller and needle roller bearings The tolerances given in the following table apply to inner rings of metric series cylindrical roller and needle roller radial bearing types in which their rings are precision finished Tolerance class PO normal tolerance Tolerance class P6 Tolerance class P5 Variation Vdsp Variation Variation Vdsp Variation Variation Vdsp Variation diameter series diameter series diameter series 9 0 2 3 Vdmp 9 0 2 3 Vdmp 9 0 2 3 Vdmp 2 5 10 10 8 6 6 9 7 5 5 5 4 3 10 18 10 8 6 6 9 7 5 5 5 4 3 18 30 13 1 0 8 8 1 0 8 6 6 6 5 3 30 50 15 12 9 9 13 1 0 8 8 8 6 4 50 80 19 19 11 11 15 15 9 9 9 7 5 80 120 25 25 15 15 19 19 11 11 1 0 8 5 120 180 31 31 19 19 23 23 14 14 13 1 0 7 180 250 38 38 23 23 28 28 17 17 15 12 8 250 315 44 44 26 26 31 31 19 19 18 14 9 315 400 50 5 0 3 0 3 0 38 38 23 23 23 18 12 400 500 56 56 34 34 44 44 26 26 No values have been established for diameter series 8 Tolerances of cylindrical roller and needle roller radial bearings Inner Ring Metric Series Tolerance in micrometers 0 001 mm Table 5 Bore Diameter Vdsp Difference between the largest and the smallest of the single bore diameters in a single radial plane Vdmp Difference between the largest and smallest of the mean bore diameters in a single radial plane of an individual ring BeAring TOLERANCES INCH METRIC continued Inner ring or shaft washer axis Axis of the cylinder inscribed in a basically cylindrical bore The inner ring or shaft washer axis is also the bearing axis Outer ring or housing washer axis Axis of the cylinder circumscribed around a basically cylindrical outside surface Radial plane Plane perpendicular to the bearing or ring axis It is however acceptable to consider radial planes referred to in the definitions as being parallel with the plane tangential to the reference face of a ring or the back face of a thrust bearing washer Radial direction Direction through the bearing or ring axis in a radial plane Axial plane Plane containing the bearing or ring axis Axial direction Direction parallel with the bearing or ring axis It is however acceptable to consider axial directions referred to in the definitions as being perpendicular to the plane tangential to the reference face of a ring or back face of a thrust bearing washer Reference face Face designated by the manufacturer of the bearings and which may be the datum for measurements NOTE The reference face for measurement is generally taken as the unmarked face In case of symmetrical rings when it is not possible to identify the reference face the tolerances are deemed to comply relative to either face but not both The reference face of a shaft and housing washer as a thrust bearing is that face intended to support axial load and is generally opposite the raceway face Outer ring flange back face That side of an outer ring flange which is intended to support axial load Middle of raceway Point or line on a raceway surface halfway between the two edges of the raceway Raceway contact diameter Diameter of the theoretical circle through the nominal points of contact between the rolling elements and raceway NOTE For roller bearings the nominal point of contact is generally at the middle of the roller Diameter deviation near ring faces In radial planes nearer the face of a ring than 1 2 times the maximum axial direction ring chamfer only the maximum material limits apply TOLERANCE TERMS SYMBOLS AND DEFINITIONS Axes planes etc 1 2 TIMES THE MAXIMUM AXIAL DIRECTION RING CHAMFER ONLY THE MAXIMUM MATERIAL LIMITS APPLY TO SINGLE DIAMETERS IN THESE AREAS 1 2 TIMES THE MAXIMUM AXIAL DIRECTION RING CHAMFER ONLY THE MAXIMUM MATERIAL LIMITS APPLY TO SINGLE DIAMETERS IN THESE AREAS d D Engineering A A46 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A47 A46 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A47 The tolerances given in the following table apply to outer rings of metric series cylindrical roller and needle roller radial bearing types in which their rings are precision finished No values have been established for diameter series 8 Applies before inserting and after removal of internal snap ring Table 6 Tolerance class PO normal tolerance Tolerance class P6 Tolerance class P5 Variation V Dsp Variation Variation VDsp Variation Variation VDsp Variation diameter series diameter series diameter series 9 0 2 3 VDmp 9 0 2 3 VDmp 9 0 2 3 VDmp 6 18 10 8 6 6 9 7 5 6 5 4 3 18 30 12 9 7 7 1 0 8 6 7 6 5 3 30 50 14 11 8 8 11 9 7 8 7 5 4 50 80 16 13 1 0 1 0 14 11 8 1 0 9 7 5 80 120 19 19 11 11 16 16 1 0 11 1 0 8 5 120 150 23 23 14 14 19 19 11 14 11 8 6 150 180 31 31 19 19 23 23 14 15 13 1 0 7 180 250 38 38 23 23 25 25 15 19 15 11 8 250 315 44 44 26 26 31 31 19 21 18 14 9 315 400 50 5 0 3 0 3 0 35 35 21 25 2 0 15 1 0 400 500 56 56 34 34 41 41 25 23 17 12 Tolerances of cylindrical roller and needle roller radial bearings OUTER Ring Metric Series Tolerance in micrometers 0 001 mm Outside Diameter VDmp Difference between the largest and the smallest of the mean outside diameters in a single radial plane of an individual ring VDsp Difference between the largest and smallest of the single outside diameters in a single radial plane BeAring TOLERANCES INCH METRIC continued A46 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A47 Engineering A A46 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A47 Tolerances of cylindrical roller thrust bearings The tolerances given in the following tables apply to thrust washers used in metric series cylindrical roller thrust bearings of dimension series 811 and 812 Table 7 Tolerance class PO normal tolerance Tolerance class P6 Tolerance class P5 Nominal bore Deviation Variation Wall thickness Deviation Variation Wall thickness Deviation Variation Wall thickness diameter Variation Variation Variation dmp Vdsp Si dmp Vdsp Si dmp Vdsp Si 18 0 8 6 1 0 0 8 6 5 0 8 6 3 18 30 0 10 8 1 0 0 10 8 5 0 10 8 3 30 50 0 12 9 1 0 0 12 9 6 0 12 9 3 50 80 0 15 11 1 0 0 15 11 7 0 15 11 4 80 120 0 20 15 15 0 20 15 8 0 20 15 4 120 180 0 25 19 15 0 25 19 9 0 25 19 5 180 250 0 30 23 2 0 0 30 23 1 0 0 30 23 5 250 315 0 35 26 25 0 35 26 13 0 35 26 7 315 400 0 40 30 3 0 0 40 30 15 0 40 30 7 400 500 0 45 34 3 0 0 45 34 18 0 45 34 9 Tolerances of cylindrical roller thrust bearings Shaft Piloted Washer Metric Series Dimensions in mm Dimensions in micrometers 0 001 mm Table 8 Nominal Tolerance class PO normal tolerance Tolerance class P6 Tolerance class P5 outside Deviation Variation Deviation Variation Deviation Variation diameter Dmp VDsp Dmp VDsp Dmp VDsp 3 0 0 13 10 0 13 10 0 13 10 30 50 0 16 12 0 16 12 0 16 12 50 80 0 19 14 0 19 14 0 19 14 80 120 0 22 17 0 22 17 0 22 17 120 180 0 25 19 0 25 19 0 25 19 180 250 0 30 23 0 30 23 0 30 23 250 315 0 35 26 0 35 26 0 35 26 315 400 0 40 30 0 40 30 0 40 30 400 500 0 45 34 0 45 34 0 45 34 Tolerances of cylindrical roller thrust bearings HOUSING PILOTED WASHER Metric Series Dimensions in mm Tolerances in micrometers 0 001 mm ABMA ISO Symbols Inner Ring dmp Single plane mean bore diameter deviation from basic bore diameter e g bore tolerance for a basically tapered bore dmp refers only to the theoretical small bore end of the bore Vdsp Difference between the largest and the smallest of the single bore diameters in a single radial plane Vdmp Difference between the largest and smallest of the mean bore diameters in a single radial plane of an individual ring ABMA ISO Symbols Outer Ring Dmp Single plane mean outside diameter deviation from basic outside diameter e g O D tolerance VDsp Difference between the largest and smallest of the single outside diameters in a single radial plane BeAring TOLERANCES INCH METRIC continued The values of the wall thickness variation Se for the Housing Piloted washer are identical to Si for the Shaft Piloted washers Engineering A A48 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A49 A48 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A49 Tolerances for needle roller and cage thrust assemblies Tolerances for the bore diameters and outside diameters of inch thrust assemblies are given in Table 9 Tolerances for bore Dc1 and outside Dc diameters of nominal inch NTA needle roller and cage thrust assemblies Deviations Needle roller Bore Diameter D c1 Outside Diameter D c Diameter Dw nominal inch inch inch low high high low 0 0781 0 002 0 007 0 010 0 020 0 1250 0 002 0 010 0 010 0 025 Table 9 Bore Inspection Procedure for Assembly The bore diameter Dc1 of the assembly should be checked with go and no go plug gages The go plug gage size is the minimum bore diameter of the assembly The no go plug gage size is the maximum bore diameter of the assembly The assembly under its own free weight must fall freely from the go plug gage The no go plug gage must not enter the bore Where the no go plug gage can be forced through the bore the assembly must not fall from the gage under its own weight Tolerances for outside diameter d1 of nominal inch TRA TRB etc thrust washers Nominal O D Deviations inch inch high low 0 24 5 25 0 010 0 030 Table 11 Tolerances for bore diameter d of nominal inch TRA TRB etc thrust washers Nominal bore diameter Deviations inch inch low high 0 24 2 25 0 002 0 012 2 25 5 25 0 002 0 017 Table 10 THRUST BEARINGS The tolerances in this table conform to ANSI ABMA Standard 21 2 Certain applications for Timken cylindrical roller bearings may require special precision tolerances Timken has for many years offered two high precision tolerance standards which augment the ABMA tolerance system If your application requires precision beyond ABMA tolerances consult your Timken representative about extraprecision and ultraprecision tolerances Thrust Cylindrical Roller Bearings TYPE TP TYPES TPS Bore O D Height Bore O D Height Bearing Bore Tolerance Bearing O D Tolerance Bearing Bore Tolerance Bearing Bore Tolerance Bearing O D Tolerance Bearing Bore Tolerance over incl 0 0 over incl 0 over incl 0 0 over incl 0 0 over incl 0 over incl 0 0 mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in in in in in in in in in 50 800 76 200 0 025 127 000 254 000 0 038 0 000 50 800 0 152 5 0 800 76 200 0 025 127 000 266 700 0 048 0 000 50 800 0 203 2 0000 3 0000 0 0010 5 0000 10 0000 0 0015 0 0000 2 0000 0 0060 2 0000 3 0000 0 0010 5 0000 10 5000 0 0019 0 0000 2 0000 0 0080 76 200 88 900 0 030 254 000 457 200 0 051 50 800 76 200 0 203 76 200 88 900 0 030 266 700 323 850 0 053 50 800 76 200 0 254 3 0000 3 5000 0 0012 10 0000 18 0000 0 0020 2 0000 3 0000 0 0080 3 0000 3 5000 0 0012 10 5000 12 7500 0 0021 2 0000 3 0000 0 0100 88 900 228 600 0 038 457 200 660 400 0 640 76 200 152 400 0 254 88 900 228 600 0 038 323 850 431 800 0 058 76 200 152 400 0 381 3 5000 9 0000 0 0015 18 0000 26 0000 0 0025 3 0000 6 0000 0 0100 3 5000 9 0000 0 0015 12 7500 17 0000 0 0023 3 0000 6 0000 0 0150 228 600 304 800 0 046 660 400 863 600 0 076 152 400 254 000 0 381 228 600 304 800 0 046 431 800 685 800 0 064 152 400 254 000 0 508 9 0000 12 0000 0 0018 26 0000 34 0000 0 0030 6 0000 10 0000 0 0150 9 0000 12 0000 0 0018 17 0000 27 0000 0 0025 6 0000 10 0000 0 0200 304 800 457 200 0 051 863 600 1117 600 0 102 254 000 457 200 0 508 304 800 457 200 0 051 685 800 889 000 0 076 254 000 457 200 0 635 12 0000 18 0000 0 0020 34 0000 44 0000 0 0040 10 0000 18 0000 0 0200 12 0000 18 0000 0 0020 27 0000 35 0000 0 0030 10 0000 18 0000 0 0250 457 200 558 800 0 064 457 200 762 000 0 635 457 200 558 800 0 064 457 200 762 000 0 762 18 0000 22 0000 0 0025 18 0000 30 0000 0 0250 18 0000 22 0000 0 0025 18 0000 30 0000 0 0300 558 800 762 000 0 076 558 800 762 000 0 076 22 0000 30 0000 0 0030 22 0000 30 0000 0 0030 The tolerances in this table conform to ANSI ABMA Standard 21 2 BeAring TOLERANCES INCH METRIC continued Tolerances for thrust washers Tolerances for the outside diameters and bore diameters of nominal inch thrust washers are given in Tables 10 and 11 A48 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A49 Engineering A A48 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A49 Tolerance Tolerance Bore Bore Radial O D O D Radial Bore Diameter Tolerance Runout Runout 0 000 mm 0 000 mm over incl 0 0000 over incl 0 0000 over incl plus minus mm mm mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in in in 80 000 120 000 0 020 0 025 12 0 000 150 000 0 020 0 041 8 0 000 120 000 0 094 0 254 3 1496 4 7244 0 0008 0 0010 4 7244 5 9055 0 0080 0 0016 3 1496 4 7244 0 0037 0 0100 120 000 180 000 0 025 0 030 15 0 000 180 000 0 025 0 046 12 0 000 180 000 0 109 0 300 4 7244 7 0866 0 0010 0 0012 5 9055 7 0866 0 0010 0 0018 4 7244 7 0866 0 0043 0 0118 180 000 250 000 0 030 0 041 18 0 000 250 000 0 030 0 051 18 0 000 250 000 0 130 0 366 7 0866 9 8425 0 0012 0 0016 7 0866 9 8425 0 0012 0 0020 7 0866 9 8425 0 0051 0 0144 250 000 315 000 0 036 0 051 25 0 000 315 000 0 036 0 061 25 0 000 315 000 0 155 0 434 9 8425 12 4016 0 0014 0 0020 9 8425 12 4016 0 0014 0 0024 9 8425 12 4016 0 0061 0 0171 315 000 400 000 0 041 0 061 315 000 400 000 0 041 0 071 315 000 400 000 0 170 0 480 12 4016 15 7480 0 0016 0 0024 12 4016 15 7480 0 0016 0 0028 12 4016 15 7480 0 0067 0 0189 400 000 500 000 0 046 0 066 4 00 000 500 000 0 046 0 081 4 00 000 500 000 0 185 0 526 15 7480 19 6850 0 0018 0 0026 15 7480 19 6850 0 0018 0 0032 15 7480 19 6850 0 0073 0 0207 500 000 630 000 0 051 0 071 5 00 000 630 000 0 051 0 102 5 00 000 0 203 0 584 19 6850 24 8031 0 0020 0 0028 19 6850 24 8031 0 0020 0 0040 19 6850 and up 0 0080 0 0230 630 000 800 000 0 076 0 081 63 0 000 800 000 0 076 0 119 24 8031 31 4961 0 0030 0 0032 24 8031 31 4961 0 0030 0 0047 800 000 1000 000 0 102 0 089 8 00 000 1000 000 0 102 0 140 31 4961 39 3701 0 0040 0 0035 31 4961 39 3701 0 0040 0 0055 1000 000 1250 000 0 127 0 102 1000 000 1250 000 0 127 0 163 39 3701 49 2126 0 0050 0 0040 39 3701 49 2126 0 0050 0 0064 125 0 000 1600 000 0 165 0 193 49 2126 62 9921 0 0065 0 0076 16 00 000 2000 000 0 203 0 229 62 9921 78 7402 0 0080 0 009 Thrust Spherical Roller Bearings Inner Ring Outer Ring Height BeAring TOLERANCES INCH METRIC continued Thrust Ball Bearings TYPE TVB TYPES TVL DTVL Bore O D Height Bore O D Height Bearing Bore Tolerance Bearing O D Tolerance Bearing Bore Tolerance Bearing Bore Tolerance Bearing O D Tolerance Bearing Bore Tolerance over incl 0 over incl 0 0 over incl Max Min over incl 0 over incl 0 0 mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in in in in in in in in 0 000 171 450 0 127 0 000 134 938 0 051 0 000 46 038 0 127 0 127 0 000 504 825 0 076 0 000 584 000 0 076 381 0 0000 6 7500 0 0050 0 0000 5 3125 0 0020 0 0000 1 8125 0 0050 0 0050 0 0000 19 8750 0 0030 0 0000 23 0000 0 0030 All Sizes 0150 171 450 508 000 0 178 134 938 441 325 0 076 46 038 304 800 0 254 0 254 504 825 1524 000 0 127 584 000 1778 000 0 127 6 7500 20 0000 0 0070 5 3125 17 3750 0 0030 1 8125 12 0000 0 0100 0 0100 19 8750 60 0000 0 0050 23 0000 70 0000 0 0050 441 325 1000 000 0 102 304 800 508 000 0 381 0 381 17 3750 39 3701 0 0040 12 0000 20 0000 0 0150 0 0150 The tolerances in this table conform to ANSI ABMA Standard 2 Engineering A A50 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A51 A50 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A51 Tolerances for Bore Diameter Dc1 and Outside Diameter Dc of Series FNT and AXK Needle Roller and Cage Thrust Assemblies D c1 Deviations of D c Deviations of min bore dia max outside dia mm E11 mm c12 m m low high high low 3 6 20 95 18 30 110 320 6 10 25 115 30 40 120 370 10 18 32 142 40 50 130 380 18 30 40 170 50 65 140 440 30 50 50 210 65 80 150 450 50 80 60 250 80 100 170 520 80 120 72 292 100 120 180 530 120 140 200 600 Tolerances for Bore Diameter d and Outside Diameter d1 of Series AS Thrust Washers d Deviations of d1 Deviations of min bore dia max outside dia mm E12 mm e13 m m low high high low 3 6 20 140 18 30 40 370 6 10 25 175 30 50 50 440 10 18 32 212 50 80 60 520 18 30 40 250 80 120 72 612 30 50 50 300 120 180 85 715 50 80 60 360 180 250 100 820 80 120 72 422 120 180 85 485 Tolerances for needle roller and cage thrust assemblies Pages C234 to C237 list the nominal outside diameter bore diameter and needle roller diameter for the FNT and AXK Series of needle roller and cage thrust assemblies and also the nominal outside diameter and bore diameter of the series AS LS WS and GS thrust washers Thickness tolerances for the AS and LS thrust washers are also included Tolerances for the outside and bore diameters of series FNT and AXK needle roller and cage thrust assemblies are given in Table 12 The needle rollers in any one assembly have a group tolerance of 2 m Table 12 Bore inspection procedure for assembly If an inspection of the bore diameter is desired the bore diameter Dc1 of the assembly should be checked with go and no go plug gages The go plug gage size is the minimum bore diameter of the assembly The no go plug gage size is the maximum bore diameter of the assembly The assembly under its own weight must fall freely from the go plug gage The no go plug gage must not enter the bore Where the no go plug gage can be forced through the bore the assembly must not fall from the gage under its own weight Table 13 Tolerances for the outside and bore diameters of series LS heavy thrust washers are given in Table 14 Thickness tolerances for series LS heavy thrust washers are given in tabular pages Tolerances for Bore Diameter d and Outside Diameter d1 of Series LS Heavy Thrust Washers d Deviations of d1 Deviations of min bore dia max outside dia mm E12 mm a12 m m low high high low 3 6 20 140 18 30 300 510 6 10 25 175 30 40 310 560 10 18 32 212 40 50 320 570 18 30 40 250 50 65 340 640 30 50 50 300 65 80 360 660 50 80 60 360 80 100 380 730 80 120 72 422 100 120 410 760 120 180 85 485 120 140 460 860 140 160 520 920 160 180 580 980 180 200 660 1120 Table 14 Bore inspection procedure for series AS and LS thrust washers If an inspection of the thrust washer bore diameter d is desired it should be checked with go and no go plug gages The go plug gage size is the minimum bore diameter of the thrust washer The no go plug gage size is the maximum bore diameter of the thrust washer The thrust washer under its own weight must fall freely from the go plug gage The no go plug gage must not enter the bore Where the no go plug gage can be forced through the bore the thrust washer must not fall from the gage under its own weight Tolerances for thrust washers Tolerances for the outside and bore diameters of series AS thrust washers are given in Table 13 Thickness tolerance for series AS thrust washers is 0 05 mm BeAring TOLERANCES INCH METRIC continued A50 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A51 Engineering A A50 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A51 Tapered Roller Bearings Timken tapered roller bearings are manufactured to a number of specifications or classes that define tolerances on dimensions such as bore O D width and runout The Timken Company produces bearings to both inch and metric systems The boundary dimension tolerances applicable to these two categories of bearings differ The major difference between the two tolerance systems is that inch bearings have historically been manufactured to positive bore and O D tolerances whereas metric bearings have been manufactured to negative tolerances Metric system bearings ISO and J prefix parts Timken manufactures metric system bearings to six tolerance classes Classes K and N are often referred to as standard classes Class N has more closely controlled bearing width tolerances than K Classes C B A and AA are precision classes These tolerances lie within those currently specified in ISO 492 with the exception of a small number of dimensions indicated in the tables The differences normally have an insignificant effect on the mounting and performance of tapered roller bearings The following table illustrates the current ISO bearing class that corresponds approximately to each of The Timken Company metric bearing classes For the exact comparison please consult your Timken representative Bearing Class Metric K N C B A AA Inch 4 2 3 0 00 000 ISO DIN Normal 6X P5 P4 P2 metric bearing tolerances m Standard Precision CONE BORE K N C B A AA Bearing Bore mm types over incl Max Min Max Min Max Min Max Min Max Min Max Min 10 18 0 12 0 12 0 7 0 5 0 5 0 5 18 30 0 12 0 12 0 8 0 6 0 6 0 6 30 50 0 12 0 12 0 10 0 8 0 8 0 8 50 80 0 15 0 15 0 12 0 9 0 8 0 8 80 120 0 20 0 20 0 15 0 10 0 8 0 8 120 180 0 25 0 25 0 18 0 13 0 8 0 8 180 250 0 30 0 30 0 22 0 15 0 8 0 8 250 265 0 35 0 35 0 22 0 15 0 8 0 8 265 315 0 35 0 35 0 22 0 15 0 8 0 8 315 400 0 40 0 40 0 25 400 500 0 45 0 45 0 25 500 630 0 50 0 30 630 800 0 80 0 40 800 1000 0 100 0 50 1000 1200 0 130 0 60 1200 1600 0 150 0 80 1600 2000 0 200 2000 0 250 TS TSF SR 1 1 SR assemblies are manufactured to tolerance class N only Bearing Class BeAring TOLERANCES INCH METRIC continued Engineering A A52 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A53 A52 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A53 Standard Precision CONE Width K N C B A AA Bearing Bore mm types over incl Max Min Max Min Max Min Max Min Max Min Max Min 10 50 0 100 0 50 0 200 0 200 0 200 0 200 50 120 0 150 0 50 0 300 0 300 0 300 0 300 120 180 0 200 0 50 0 300 0 300 0 300 0 300 180 250 0 200 0 50 0 350 0 350 0 350 0 350 250 265 0 200 0 50 0 350 0 350 0 350 0 350 265 315 0 200 0 50 0 350 0 350 0 350 0 350 315 500 0 250 0 50 0 350 500 630 0 250 0 350 630 1200 0 300 0 350 1200 1600 0 350 0 350 1600 0 350 TS TSF metric bearing tolerances m Bearing Class Standard Precision Cup O D K N C B A AA Bearing O D mm types over incl Max Min Max Min Max Min Max Min Max Min Max Min 10 18 0 8 0 8 18 30 0 12 0 12 0 8 0 6 0 8 0 8 30 50 0 14 0 14 0 9 0 7 0 8 0 8 50 80 0 16 0 16 0 11 0 9 0 8 0 8 80 120 0 18 0 18 0 13 0 10 0 8 0 8 120 150 0 20 0 20 0 15 0 11 0 8 0 8 150 180 0 25 0 25 0 18 0 13 0 8 0 8 180 250 0 30 0 30 0 20 0 15 0 8 0 8 250 265 0 35 0 35 0 25 0 18 0 8 0 8 265 315 0 35 0 35 0 25 0 18 0 8 0 8 315 400 0 40 0 40 0 28 0 18 400 500 0 45 0 45 0 30 500 630 0 50 0 50 0 35 630 800 0 80 0 40 800 1000 0 100 0 50 1000 1200 0 130 0 60 1200 1600 0 165 0 80 1600 2000 0 200 2000 0 250 TS TSF SR 1 1 SR assemblies are manufactured to tolerance class N only metric bearing tolerances m Bearing Class BeAring TOLERANCES INCH METRIC continued A52 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A53 Engineering A A52 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A53 Standard Precision Cup Width K N C B A AA Bearing O D mm types over incl Max Min Max Min Max Min Max Min Max Min Max Min 10 80 0 150 0 100 0 150 0 150 0 150 0 150 80 150 0 200 0 100 0 200 0 200 0 200 0 200 150 180 0 200 0 100 0 250 0 250 0 250 0 250 180 250 0 250 0 100 0 250 0 250 0 250 0 250 250 265 0 250 0 100 0 300 0 300 0 300 0 300 265 315 0 250 0 100 0 300 0 300 0 300 0 300 315 400 0 250 0 100 0 300 0 300 400 500 0 300 0 100 0 350 500 800 0 300 0 100 0 350 800 1200 0 350 0 400 1200 1600 0 400 0 400 1600 0 400 TS TSF s These differ slightly from tolerances in ISO 492 These differences normally have an insignificant effect on the mounting and performance of tapered roller bearings The 30000 series ISO bearings are also available with the above parameter according to ISO 492 s metric bearing tolerances m Bearing Class Standard Precision CONE Stand K N C B A AA Bearing Bore mm types over incl Max Min Max Min Max Min Max Min Max Min Max Min 10 80 100 0 50 0 100 100 80 120 100 100 50 0 100 100 120 180 150 150 50 0 100 100 180 250 150 150 50 0 100 150 250 265 150 150 100 0 100 150 265 315 150 150 100 0 100 150 315 400 200 200 100 0 150 150 400 TS TSF These sizes manufactured as matched assemblies only metric bearing tolerances m Bearing Class Cone Stand Cone stand is a measure of the variation in cone raceway size and taper and roller diameter and taper which is checked by measuring the axial location of the reference surface of a master cup or other type gage with respect to the reference face of the cone Standard Precision Cup Stand K N C B A AA Bearing Bore mm types over incl Max Min Max Min Max Min Max Min Max Min Max Min 10 18 100 0 50 0 100 100 18 80 100 0 50 0 100 100 80 120 100 100 50 0 100 100 120 265 200 100 100 0 100 150 265 315 200 100 100 0 100 150 315 400 200 200 100 0 100 150 400 TS TSF 1 These sizes manufactured as matched assemblies only 1 Stand for flanged cup is measured from flange backface seating face metric bearing tolerances m Bearing Class Cup Stand Cup stand is a measure of the variation in cup I D size and taper which is checked by measuring the axial location of the reference surface of a master plug or other type gage with respect to the reference face of the cup BeAring TOLERANCES INCH METRIC continued Engineering A A54 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A55 A54 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A55 Overall Bearing Standard Precision Width K N C B A AA Bearing Bore mm types over incl Max Min Max Min Max Min Max Min Max Min Max Min 10 80 200 0 100 0 200 200 200 200 200 200 200 200 80 120 200 200 100 0 200 200 200 200 200 200 200 200 120 180 350 250 150 0 350 250 200 250 200 250 200 250 180 250 350 250 150 0 350 250 200 300 200 300 200 300 250 265 350 250 200 0 350 300 200 300 200 300 200 300 265 315 350 250 200 0 350 300 200 300 200 300 200 300 315 500 400 400 200 0 350 300 500 800 400 400 350 400 800 1000 450 450 350 400 1000 1200 450 450 350 450 1200 1600 450 450 350 500 1600 450 450 10 500 0 150 TS TSF 2 SR 3 2 For bearing type TSF the tolerance applies to the dimension T1 3 SR assemblies are manufactured to tolerance class N only metric bearing tolerances m Bearing Class metric bearing tolerances m Bearing Class Bearing O D mm types over incl K N C B A AA 10 18 1 9 1 18 30 18 18 5 3 1 9 1 30 50 20 20 6 3 1 9 1 50 80 25 25 6 4 1 9 1 80 120 35 35 6 4 1 9 1 120 150 40 40 7 4 1 9 1 150 180 45 45 8 4 1 9 1 180 250 50 50 10 5 1 9 1 250 265 60 60 11 5 1 9 1 265 315 60 60 11 5 1 9 1 315 400 70 70 13 5 400 500 80 80 18 500 630 100 25 630 800 120 35 800 1000 140 50 1000 1200 160 60 1200 1600 180 80 1600 2000 200 2000 200 TS TSF SR 1 1 SR assemblies are manufactured to tolerance class N only Assembled Bearing Maximum Radial Runout Standard Precision BeAring TOLERANCES INCH METRIC continued A54 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A55 Engineering A A54 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A55 INCH SYSTEM BEARINGS Inch system bearings are manufactured to a number of tolerance classes Classes 4 and 2 are often referred to as standard classes Class 2 has certain tolerances more closely controlled than class 4 and thus may be required for specific applications Classes 3 0 00 and 000 are precision classes Standard Precision CONE BORE 4 2 3 0 00 000 Bearing Bore mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min 0 76 200 13 0 13 0 13 0 13 0 8 0 8 0 0 3 0000 5 0 5 0 5 0 5 0 3 0 3 0 76 200 304 800 25 0 25 0 13 0 13 0 8 0 8 0 3 0000 12 0000 10 0 10 0 5 0 5 0 3 0 3 0 304 800 609 600 51 0 25 0 12 0000 24 0000 20 0 10 0 609 600 914 400 76 0 38 0 24 0000 36 0000 30 0 15 0 914 400 1219 200 102 0 51 0 36 0000 48 0000 40 0 20 0 1219 200 127 0 76 0 48 0000 50 0 30 0 TS TSF Tsl 1 ss tdi tdit tdo tna 1 For TSL bearings these are the normal tolerances of cone bore However bore size can be slightly reduced at large end due to tight fit assembly of the seal on the rib This should not have any effect on the performance of the bearing Inch bearing tolerances m AND 0 0001 inch Bearing Class Standard Precision Cup O D 4 2 3 0 00 000 Bearing Bore mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min 0 304 800 25 0 25 0 13 0 13 0 8 0 8 0 0 12 0000 10 0 10 0 5 0 5 0 3 0 3 0 304 800 609 600 51 0 51 0 25 0 12 0000 24 0000 20 0 20 0 10 0 609 600 914 400 76 0 76 0 38 0 24 0000 36 0000 30 0 30 0 15 0 914 400 1219 200 102 0 51 0 36 0000 48 0000 40 0 20 0 1219 200 127 0 76 0 48 0000 50 0 30 0 TS TSF Tsl ss tdi tdit tdo tna tnasw tnaswe Inch bearing tolerances m AND 0 0001 inch Bearing Class BeAring TOLERANCES INCH METRIC continued Engineering A A56 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A57 A56 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A57 outer race Flange O d Standard Precision 4 2 3 0 00 000 Bearing O D mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min 51 0 52 0 51 0 51 0 51 0 51 0 20 0 20 0 20 0 20 0 20 0 20 0 304 800 609 600 76 0 76 0 76 0 12 0000 24 0000 30 0 30 0 30 0 609 600 914 400 102 0 102 0 102 0 24 0000 36 0000 40 0 40 0 40 0 914 400 127 0 127 0 36 0000 40 0 50 0 TSF Inch bearing tolerances m AND 0 0001 inch Bearing Class Inner race width Standard Precision 4 2 3 0 00 000 Bearing O D mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min All Sizes 76 254 76 254 76 254 76 254 76 254 76 254 30 100 30 100 30 100 30 100 30 100 30 100 TS TSF Tsl ss tdi tdit tdo Inch bearing tolerances m AND 0 0001 inch Bearing Class Outer race width Standard Precision 4 2 3 0 00 000 Bearing O D mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min All Sizes 51 254 51 254 51 254 51 254 51 254 51 254 20 100 20 100 20 100 20 100 20 100 20 100 All Types Inch bearing tolerances m AND 0 0001 inch Bearing Class BeAring TOLERANCES INCH METRIC continued A56 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A57 Engineering A A56 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A57 Standard Precision CONE Stand 4 2 3 0 00 000 Bearing O D mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min 0 101 600 102 0 102 0 102 102 0 4 0000 40 0 40 0 40 40 101 600 266 700 152 152 102 0 102 102 4 0000 10 5000 60 60 40 0 40 40 266 700 304 800 152 152 102 0 102 102 10 5000 12 0000 60 60 40 0 40 40 304 800 406 400 178 178 102 102 12 0000 16 0000 70 70 40 40 406 400 16 0000 TS Tsl ss tdi 1 tdit 1 tdo These sizes manufactured as matched assemblies only 1 For class 2 TDI and TDIT bearings with cone bore of 101 600 to 304 800 mm 4 in to 12 in the cone stand is 102 40 Inch bearing tolerances m AND 0 0001 inch Bearing Class Standard Precision CUP Stand 4 2 3 0 00 000 Bearing Bore mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min 0 101 600 102 0 102 0 102 102 0 4 0000 40 0 40 0 40 40 101 600 266 700 203 102 102 0 102 102 4 0000 10 5000 80 40 40 0 40 40 266 700 304 800 203 102 102 0 102 102 10 5000 12 0000 80 40 40 0 40 40 304 800 406 400 203 203 102 102 12 0000 16 0000 80 80 40 40 406 400 16 0000 TS Tsf 1 TSL ss tdi tdit These sizes manufactured as matched assemblies only 1 Stand for flanged cup is measured from flange backface seating face Inch bearing tolerances m AND 0 0001 inch Bearing Class Cone Stand Cone stand is a measure of the variation in cone raceway size and taper and roller diameter and taper which is checked by measuring the axial location of the reference surface of a master cup or other type gage with respect to the reference face of the cone Cup Stand Cup stand is a measure of the variation in cup I D size and taper which is checked by measuring the axial location of the reference surface of a master plug or other type gage with respect to the reference face of the cup BeAring TOLERANCES INCH METRIC continued Engineering A A58 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A59 A58 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A59 TS TSF 1 Tsl tna tnasw tnaswe tdi tdit tdo SS 1 For bearing type TSF the tolerance applies to the dimension T1 Inch bearing tolerances m AND 0 0001 inch Bearing Class Overall Bearing Standard Precision Width 4 2 3 0 00 000 Bearing Bore mm in O D mm in types over incl over incl Max Min Max Min Max Min Max Min Max Min Max Min 0 101 600 203 0 203 0 203 203 203 203 203 203 203 203 0 4 0000 80 0 80 0 80 80 80 80 80 80 80 80 101 600 304 800 356 254 203 0 203 203 203 203 203 203 203 203 4 0000 12 0000 140 100 80 0 80 80 80 80 80 80 80 80 304 800 609 600 0 508 000 381 381 203 203 12 0000 24 0000 0 20 0000 150 150 80 80 304 800 609 600 508 000 381 381 381 381 12 0000 24 0000 20 0000 150 150 150 150 609 600 381 381 381 381 24 0000 150 150 150 150 0 127 000 254 0 254 0 0 5 0000 100 0 100 0 127 000 762 0 762 0 5 0000 300 0 300 0 0 101 600 406 0 406 0 406 406 406 406 406 406 406 406 0 4 0000 160 0 160 0 160 160 160 160 160 160 160 160 101 600 304 800 711 508 406 203 406 406 406 406 406 406 406 406 4 0000 12 0000 280 200 160 80 160 160 160 160 160 160 160 160 304 800 609 600 0 508 000 762 762 406 406 12 0000 24 0000 0 20 0000 300 300 160 160 304 800 609 600 508 000 762 762 762 762 12 0000 24 0000 20 0000 300 300 300 300 609 600 762 762 762 762 24 0000 300 300 300 300 0 101 600 457 51 457 51 0 4 0000 180 20 180 20 Assembled Bearing Standard Precision Maximum Radial Runout 4 2 3 0 00 000 Bearing O D mm in types over incl Max Min Max Min Max Min Max Min Max Min Max Min 0 51 38 8 4 2 1 0 20 15 3 1 5 0 75 0 40 266 700 304 800 51 38 8 4 2 1 10 5000 12 0000 20 15 3 1 5 0 75 0 40 304 800 609 600 51 38 18 12 0000 24 0000 20 15 7 609 600 914 400 76 51 51 24 0000 36 0000 30 20 20 914 400 76 76 36 0000 30 30 TS TSF Tsl ss tdi tdit tdo tna tnasw tnaswe Inch bearing tolerances m AND 0 0001 inch Bearing Class BeAring TOLERANCES INCH METRIC continued A58 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A59 Engineering A A58 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A59 Bearing Class Standard Precision Range mm in 2 3 over incl Max Min Max Min 0 3 04 800 25 0 13 0 0 12 0000 10 0 5 0 304 800 6 09 600 51 0 25 0 12 0000 24 0000 20 0 10 0 609 600 914 400 76 0 38 0 24 0000 36 0000 30 0 15 0 914 400 1219 200 102 0 51 0 36 0000 48 0000 40 0 20 0 1219 200 127 0 76 0 48 0000 50 0 30 0 Bore Bearing Class Standard Precision Range mm in 2 3 over incl Max Min Max Min 0 3 04 800 25 0 13 0 0 12 0000 10 0 5 0 304 800 6 09 600 51 0 25 0 12 0000 24 0000 20 0 10 0 609 600 914 400 76 0 38 0 24 0000 36 0000 30 0 15 0 914 400 1219 200 102 0 51 0 36 0000 48 0000 40 0 20 0 1219 200 127 0 76 0 48 0000 50 0 30 0 Outside Diameter Bearing Class Standard Precision 2 3 Max Min Max Min 381 381 203 203 150 150 80 80 Width All sizes thrust tapered roller bearing TThd ttvf ttvs tolerances m and 0 0001 in BeAring TOLERANCES INCH METRIC continued Engineering A A60 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A61 A60 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A61 thrust tapered roller bearing TTc ttsp class 4 tolerances m and 0 0001 inch Deviation Range mm in over incl Max Min 0 25 400 76 76 0 1 0000 30 30 25 400 76 200 102 102 1 0000 3 0000 40 40 76 200 127 127 3 0000 50 50 Bore Deviation Range mm in over incl Max Min 0 127 000 254 0 0 5 0000 100 0 127 000 2 03 200 381 0 5 0000 8 0000 150 0 203 200 508 0 8 0000 200 0 outside diameter Deviation Range mm in over incl Max Min 0 76 200 254 254 0 3 0000 100 100 76 200 127 000 381 381 3 0000 5 0000 150 150 127 000 508 508 5 0000 200 200 width BeAring TOLERANCES INCH METRIC continued A60 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A61 Engineering A A60 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A61 Deviations in m Deviations in m Diameters mm B10 B11 B12 C9 C10 C11 high low high low high low high low high low high low 3 6 188 140 215 140 260 140 100 70 118 70 145 70 6 10 208 150 240 150 300 150 116 80 138 80 170 80 10 18 220 150 260 150 330 150 138 95 165 95 205 95 18 30 244 160 290 160 370 160 162 110 194 110 240 110 30 40 270 170 330 170 420 170 182 120 220 120 280 120 40 50 280 180 340 180 430 180 192 130 230 130 290 130 50 65 310 190 380 190 490 190 214 140 260 140 330 140 65 80 320 200 390 200 500 200 224 150 270 150 340 150 80 100 360 220 440 220 570 220 257 170 310 170 390 170 100 120 380 240 460 240 590 240 267 180 320 180 400 180 120 140 420 260 510 260 660 260 300 200 360 200 450 200 140 160 440 280 530 280 680 280 310 210 370 210 460 210 160 180 470 310 560 310 710 310 330 230 390 230 480 230 180 200 525 340 630 340 800 340 355 240 425 240 530 240 200 225 565 380 670 380 840 380 375 260 445 260 550 260 225 250 605 420 710 420 880 420 395 280 465 280 570 280 250 280 690 480 800 480 1000 480 430 300 510 300 620 300 280 315 750 540 860 540 1060 540 460 330 540 330 650 330 315 355 830 600 960 600 1170 600 500 360 590 360 720 360 355 400 910 680 1040 680 1250 680 540 400 630 400 760 400 400 450 1010 760 1160 760 1390 760 595 440 690 440 840 440 450 500 1090 840 1240 840 1470 840 635 480 730 480 880 480 Deviations in m Diameters mm E9 E10 E11 E12 E13 high low high low high low high low high low 3 6 50 20 68 20 95 20 140 20 200 20 6 10 61 25 83 25 115 25 175 25 245 25 10 18 75 32 102 32 142 32 212 32 302 32 18 30 92 40 124 40 170 40 250 40 370 40 30 50 112 50 150 50 210 50 300 50 440 50 50 80 134 60 180 60 250 60 360 60 520 60 80 120 159 72 212 72 292 72 422 72 612 72 120 180 185 85 245 85 335 85 485 85 715 85 180 250 215 100 285 100 390 100 560 100 820 100 250 315 240 110 320 110 430 110 630 110 920 110 315 400 265 125 355 125 485 125 695 125 1015 125 400 500 290 135 385 135 535 135 765 135 1105 135 Deviations in m Diameters mm F5 F6 F7 F8 high low high low high low high low 3 6 15 10 18 10 22 10 28 10 6 10 19 13 22 13 28 13 35 13 10 18 24 16 27 16 34 16 43 16 18 30 29 20 33 20 41 20 53 20 30 50 36 25 41 25 50 25 64 25 50 80 43 30 49 30 60 30 76 30 80 120 51 36 58 36 71 36 90 36 120 180 61 43 68 43 83 43 106 43 180 250 70 50 79 50 96 50 122 50 250 315 79 56 88 56 108 56 137 56 315 400 87 62 98 62 119 62 151 62 400 500 95 68 108 68 131 68 165 68 ISO TOLERANCES FOR HOLES Metric The following tables provide standard ISO tolerance information They are provided for general use and are referenced throughout this catalog BeAring TOLERANCES INCH METRIC continued Engineering A A62 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A63 A62 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A63 Deviations in m Diameters mm G5 G6 G7 high low high low high low 3 6 9 4 12 4 16 4 6 10 11 5 14 5 20 5 10 18 14 6 17 6 24 6 18 30 16 7 20 7 28 7 30 50 20 9 25 9 34 9 50 80 23 10 29 10 40 10 80 120 27 12 34 12 47 12 120 180 32 14 39 14 54 14 180 250 35 15 44 15 61 15 250 315 40 17 49 17 69 17 315 400 43 18 54 18 75 18 400 500 47 20 60 20 83 20 Deviations in m Diameters mm H4 H5 H6 H7 H8 high low high low high low high low high low 3 6 4 0 5 0 8 0 12 0 18 0 6 10 4 0 6 0 9 0 15 0 22 0 10 18 5 0 8 0 11 0 18 0 27 0 18 30 6 0 9 0 13 0 21 0 33 0 30 50 7 0 11 0 16 0 25 0 39 0 50 80 8 0 13 0 19 0 30 0 46 0 80 120 10 0 15 0 22 0 35 0 54 0 120 180 12 0 18 0 25 0 40 0 63 0 180 250 14 0 20 0 29 0 46 0 72 0 250 315 16 0 23 0 32 0 52 0 81 0 315 400 18 0 25 0 36 0 57 0 89 0 400 500 20 0 27 0 40 0 63 0 97 0 Deviations in m Diameters mm H9 H10 H11 H12 high low high low high low high low 3 6 30 0 48 0 75 0 120 0 6 10 36 0 58 0 90 0 150 0 10 18 43 0 70 0 110 0 180 0 18 30 52 0 84 0 130 0 210 0 30 50 62 0 100 0 160 0 250 0 50 80 74 0 120 0 190 0 300 0 80 120 87 0 140 0 220 0 350 0 120 180 100 0 160 0 250 0 400 0 180 250 115 0 185 0 290 0 460 0 250 315 130 0 210 0 320 0 520 0 315 400 140 0 230 0 360 0 570 0 400 500 155 0 250 0 400 0 630 0 ISO TOLERANCES FOR HOLES Metric BeAring TOLERANCES INCH METRIC continued A62 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A63 Engineering A A62 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A63 ISO TOLERANCES FOR HOLES Metric BeAring TOLERANCES INCH METRIC continued Deviations in m Deviations in m Diameters mm J6 J7 J8 K6 K7 K8 high low high low high low high low high low high low 3 6 5 3 6 6 10 8 2 6 3 9 5 13 6 10 5 4 8 7 12 10 2 7 5 10 6 16 10 18 6 5 10 8 15 12 2 9 6 12 8 19 18 30 8 5 12 9 20 13 2 11 6 15 10 23 30 50 10 6 14 11 24 15 3 13 7 18 12 27 50 80 13 6 18 12 28 18 4 15 9 21 14 32 80 120 16 6 22 13 34 20 4 18 10 25 16 38 120 180 18 7 26 14 41 22 4 21 12 28 20 43 180 250 22 7 30 16 47 25 5 24 13 33 22 50 250 315 25 7 36 16 55 26 5 27 16 36 25 56 315 400 29 7 39 18 60 29 7 29 17 40 28 61 400 500 33 7 43 20 66 31 8 32 18 45 29 68 Deviations in m Deviations in m Diameters mm M5 M6 M7 N6 N7 N8 high low high low high low high low high low high low 3 6 3 8 1 9 0 12 5 13 4 16 2 20 6 10 4 10 3 12 0 15 7 16 4 19 3 25 10 18 4 12 4 15 0 18 9 20 5 23 3 30 18 30 5 14 4 17 0 21 11 24 7 28 3 36 30 50 5 16 4 20 0 25 12 28 8 33 3 42 50 80 6 19 5 24 0 30 14 33 9 39 4 50 80 120 8 23 6 28 0 35 16 38 10 45 4 58 120 180 9 27 8 33 0 40 20 45 12 52 4 67 180 250 11 31 8 37 0 46 22 51 14 60 5 77 250 315 13 36 9 41 0 52 25 57 14 66 5 86 315 400 14 39 10 46 0 57 26 62 16 73 5 94 400 500 16 43 10 50 0 63 27 67 17 80 6 103 Deviations in m Deviations in m Diameters mm P6 P7 R6 R7 R8 high low high low high low high low high low 3 6 9 17 8 20 12 20 11 23 15 33 6 10 12 21 9 24 16 25 13 28 19 41 10 18 15 26 11 29 20 31 16 34 23 50 18 30 18 31 14 35 24 37 20 41 28 61 30 50 21 37 17 42 29 45 25 50 34 73 50 65 26 45 21 51 35 54 30 60 41 87 65 80 26 45 21 51 37 56 32 62 43 89 80 100 30 52 24 59 44 66 38 73 51 105 100 120 30 52 24 59 47 69 41 76 54 108 120 140 37 61 28 68 56 81 48 88 63 126 140 160 36 61 28 68 58 83 50 90 65 128 160 180 36 61 28 68 61 86 53 93 68 131 180 200 41 70 33 79 68 97 60 106 77 149 200 225 41 70 33 79 71 100 63 109 80 152 225 250 41 70 33 79 75 104 67 113 84 156 250 280 47 79 36 88 85 117 74 126 94 175 280 315 47 79 36 88 89 121 78 130 98 179 315 355 51 87 41 98 97 133 87 144 108 197 355 400 51 87 41 98 103 139 93 150 114 203 400 450 55 95 45 108 113 153 103 166 126 223 450 500 55 95 45 108 119 159 109 172 132 229 Engineering A A64 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A65 A64 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A65 Deviations in m Diameters mm a10 a11 a12 a13 high low high low high low high low 3 270 310 270 330 270 370 270 410 3 6 270 318 270 345 270 390 270 450 6 10 280 338 280 370 280 430 280 500 10 18 290 360 290 400 290 470 290 560 18 30 300 384 300 430 300 510 300 630 30 40 310 410 310 470 310 560 310 700 40 50 320 420 320 480 320 570 320 710 50 65 340 460 340 530 340 640 340 800 65 80 360 480 360 550 360 660 360 820 80 100 380 520 380 600 380 730 380 920 100 120 410 550 410 630 410 760 410 950 120 140 460 620 460 710 460 860 460 1090 140 160 520 680 520 770 520 920 520 1150 160 180 580 740 580 830 580 980 580 1210 180 200 660 845 660 950 660 1120 660 1380 200 225 740 925 740 1030 740 1200 740 1460 225 250 820 1005 820 1110 820 1280 820 1540 250 280 920 1130 920 1240 920 1440 920 1730 280 315 1050 1260 1050 1370 1050 1570 1050 1860 315 355 1200 1430 1200 1560 1200 1770 1200 2090 355 400 1350 1580 1350 1710 1350 1920 1350 2240 Deviations in m Deviations in m Diameters mm c11 c12 c13 e11 e12 e13 high low high low high low high low high low high low 3 60 120 60 160 60 200 14 74 14 114 14 154 3 6 70 145 70 190 70 250 20 95 20 140 20 200 6 10 80 170 80 230 80 300 25 115 25 175 25 245 10 18 95 205 95 275 95 365 32 142 32 212 32 302 18 30 110 240 110 320 110 440 40 170 40 250 40 370 30 40 120 280 120 370 120 510 50 210 50 300 50 440 40 50 130 290 130 380 130 520 50 210 50 300 50 440 50 65 140 330 140 440 140 600 60 250 60 360 60 520 65 80 150 340 150 450 150 610 60 250 60 360 60 520 80 100 170 390 170 520 170 710 72 292 72 422 72 612 100 120 180 400 180 530 180 720 72 292 72 422 72 612 120 140 200 450 200 600 200 830 85 335 85 485 85 715 140 160 210 460 210 610 210 840 85 335 85 485 85 715 160 180 230 480 230 630 230 860 85 335 85 485 85 715 180 200 240 530 240 700 240 960 100 390 100 560 100 820 200 225 260 550 260 720 260 980 100 390 100 560 100 820 225 250 280 570 280 740 280 1000 100 390 100 560 100 820 250 280 300 620 300 820 300 1110 110 430 110 630 110 920 280 315 330 650 330 850 330 1140 110 430 110 630 110 920 315 355 360 720 360 930 360 1250 125 485 125 695 125 1015 ISO TOLERANCES FOR SHAFTS Metric BeAring TOLERANCES INCH METRIC continued A64 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A65 Engineering A A64 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A65 Deviations in m Diameters mm h9 h10 h11 h12 h13 high low high low high low high low high low 3 0 25 0 40 0 60 0 100 0 140 3 6 0 30 0 48 0 75 0 120 0 180 6 10 0 36 0 58 0 90 0 150 0 220 10 18 0 43 0 70 0 110 0 180 0 270 18 30 0 52 0 84 0 130 0 210 0 330 30 50 0 62 0 100 0 160 0 250 0 390 50 80 0 74 0 120 0 190 0 300 0 460 80 120 0 87 0 140 0 220 0 350 0 540 120 180 0 100 0 160 0 250 0 400 0 630 180 250 0 115 0 185 0 290 0 460 0 720 250 315 0 130 0 210 0 320 0 520 0 810 315 400 0 140 0 230 0 360 0 570 0 890 Deviations in m Deviations in m Diameters mm f5 f6 f7 g5 g6 g7 high low high low high low high low high low high low 3 6 10 6 12 6 16 2 6 2 8 2 12 3 6 10 15 10 18 10 22 4 9 4 12 4 16 6 10 13 19 13 22 13 28 5 11 5 14 5 20 10 18 16 24 16 27 16 34 6 14 6 17 6 24 18 30 20 29 20 33 20 41 7 16 7 20 7 28 30 50 25 36 25 41 25 50 9 20 9 25 9 34 50 80 30 43 30 49 30 60 10 23 10 29 10 40 80 120 36 51 36 58 36 71 12 27 12 34 12 47 120 180 43 61 43 68 43 83 14 32 14 39 14 54 180 250 50 70 50 79 50 96 15 35 15 44 15 61 250 315 56 79 56 88 56 108 17 40 17 49 17 69 315 400 62 87 62 98 62 119 18 43 18 54 18 75 Deviations in m Diameters mm h4 h5 h6 h7 h8 high low high low high low high low high low 3 0 3 0 4 0 6 0 10 0 14 3 6 0 4 0 5 0 8 0 12 0 18 6 10 0 4 0 6 0 9 0 15 0 22 10 18 0 5 0 8 0 11 0 18 0 27 18 30 0 6 0 9 0 13 0 21 0 33 30 50 0 7 0 11 0 16 0 25 0 39 50 80 0 8 0 13 0 19 0 30 0 46 80 120 0 10 0 15 0 22 0 35 0 54 120 180 0 12 0 18 0 25 0 40 0 63 180 250 0 14 0 20 0 29 0 46 0 72 250 315 0 16 0 23 0 32 0 52 0 81 315 400 0 18 0 25 0 36 0 57 0 89 ISO TOLERANCES FOR SHAFTS Metric BeAring TOLERANCES INCH METRIC continued Engineering A A66 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A67 A66 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A67 ISO TOLERANCES FOR SHAFTS Metric BeAring TOLERANCES INCH METRIC continued Deviations in m Deviations in m Diameters mm j5 j6 j7 k5 k6 k7 high low high low high low high low high low high low 3 2 2 4 2 6 4 4 0 6 0 10 0 3 6 3 2 6 2 8 4 6 1 9 1 13 1 6 10 4 2 7 2 10 5 7 1 10 1 16 1 10 18 5 3 8 3 12 6 9 1 12 1 19 1 18 30 5 4 9 4 13 8 11 2 15 2 23 2 30 50 6 5 11 5 15 10 13 2 18 2 27 2 50 80 6 7 12 7 18 12 15 2 21 2 32 2 80 120 6 9 13 9 20 15 18 3 25 3 38 3 120 180 7 11 14 11 22 18 21 3 28 3 43 3 180 250 7 13 16 13 25 21 24 4 33 4 50 4 250 315 7 16 16 16 26 26 27 4 36 4 56 4 315 400 7 18 18 18 29 28 29 4 40 4 61 4 Deviations in m Deviations in m Diameters mm m5 m6 m7 n5 n6 n7 high low high low high low high low high low high low 3 6 2 8 2 12 2 8 4 10 4 14 4 3 6 9 4 12 4 16 4 13 8 16 8 20 8 6 10 12 6 15 6 21 6 16 10 19 10 25 10 10 18 15 7 18 7 25 7 20 12 23 12 30 12 18 30 17 8 21 8 29 8 24 15 28 15 36 15 30 50 20 9 25 9 34 9 28 17 33 17 42 17 50 80 24 11 30 11 41 11 33 20 39 20 50 20 80 120 28 13 35 13 48 13 38 23 45 23 58 23 120 180 33 15 40 15 55 15 45 27 52 27 67 27 180 250 37 17 46 17 63 17 51 31 60 31 77 31 250 315 43 20 52 20 72 20 57 34 66 34 86 34 315 400 46 21 57 21 78 21 62 37 73 37 94 37 Deviations in m Diameters mm p6 r6 r7 high low high low high low 3 6 6 10 10 18 18 30 30 50 50 65 65 80 80 100 59 37 100 120 59 37 120 140 68 43 90 65 140 160 68 43 90 65 160 180 68 43 90 65 180 200 79 50 106 77 200 225 79 50 109 80 126 80 225 250 79 50 113 84 130 84 250 280 88 56 126 94 146 94 280 315 88 56 130 98 150 98 315 355 98 62 144 108 165 108 355 400 98 62 150 114 171 114 400 450 108 68 166 126 189 126 450 500 108 68 172 132 195 132 A66 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A67 Engineering A A66 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A67 Deviations in inches Deviations in inches Diameters inches B10 B11 B12 C9 C10 C11 high low high low high low high low high low high low 0 1181 0 2362 0 0074 0 0055 0 0085 0 0055 0 0102 0 0055 0 0039 0 0028 0 0046 0 0028 0 0057 0 0028 0 2362 0 3937 0 0082 0 0059 0 0094 0 0059 0 0118 0 0059 0 0046 0 0031 0 0054 0 0031 0 0067 0 0031 0 3937 0 7087 0 0087 0 0059 0 0102 0 0059 0 0130 0 0059 0 0054 0 0037 0 0065 0 0037 0 0081 0 0037 0 7087 1 1811 0 0096 0 0063 0 0114 0 0063 0 0146 0 0063 0 0064 0 0043 0 0076 0 0043 0 0094 0 0043 1 1811 1 5748 0 0106 0 0067 0 0130 0 0067 0 0165 0 0067 0 0072 0 0047 0 0087 0 0047 0 0110 0 0047 1 5748 1 9685 0 0110 0 0071 0 0134 0 0071 0 0169 0 0071 0 0076 0 0051 0 0091 0 0051 0 0114 0 0051 1 9685 2 5591 0 0122 0 0075 0 0150 0 0075 0 0193 0 0075 0 0084 0 0055 0 0102 0 0055 0 0120 0 0055 2 5591 3 1496 0 0126 0 0079 0 0154 0 0079 0 0197 0 0079 0 0088 0 0059 0 0106 0 0059 0 0134 0 0059 3 1496 3 9370 0 0142 0 0087 0 0173 0 0087 0 0224 0 0087 0 0101 0 0067 0 0122 0 0067 0 0154 0 0067 3 9370 4 7244 0 0150 0 0094 0 0181 0 0094 0 0232 0 0094 0 0105 0 0071 0 0126 0 0071 0 0157 0 0071 4 7244 5 5118 0 0165 0 0102 0 0201 0 0102 0 0260 0 0102 0 0118 0 0079 0 0142 0 0079 0 0177 0 0079 5 5118 6 2992 0 0173 0 0110 0 0209 0 0110 0 0268 0 0110 0 0122 0 0083 0 0146 0 0083 0 0181 0 0083 6 2992 7 0866 0 0185 0 0122 0 0220 0 0122 0 0280 0 0122 0 0130 0 0091 0 0154 0 0091 0 0189 0 0091 7 0866 7 8740 0 0207 0 0134 0 0248 0 0134 0 0315 0 0134 0 0140 0 0094 0 0167 0 0094 0 0209 0 0094 7 8740 8 8583 0 0222 0 0150 0 0264 0 0150 0 0331 0 0150 0 0148 0 0102 0 0175 0 0102 0 0217 0 0102 8 8583 9 8425 0 0238 0 0165 0 0280 0 0165 0 0346 0 0165 0 0156 0 0110 0 0183 0 0110 0 0224 0 0110 9 8425 11 0236 0 0272 0 0189 0 0315 0 0189 0 0394 0 0189 0 0169 0 0118 0 0201 0 0118 0 0244 0 0118 11 0236 12 4016 0 0295 0 0213 0 0339 0 0213 0 0417 0 0213 0 0181 0 0130 0 0213 0 0130 0 0256 0 0130 12 4016 13 9764 0 0327 0 0236 0 0378 0 0236 0 0461 0 0236 0 0197 0 0142 0 0232 0 0142 0 0283 0 0142 13 9764 15 7480 0 0358 0 0268 0 0409 0 0268 0 0492 0 0268 0 0213 0 0157 0 0248 0 0157 0 0299 0 0157 15 7480 17 7165 0 0398 0 0299 0 0457 0 0299 0 0547 0 0299 0 0234 0 0173 0 0272 0 0173 0 0331 0 0173 17 71654 19 6850 0 0429 0 0331 0 0488 0 0331 0 0579 0 0331 0 0250 0 0189 0 0287 0 0189 0 0346 0 0189 Deviations in inches Diameters inches E9 E10 E11 E12 E13 high low high low high low high low high low 0 1181 0 2362 0 0020 0 0008 0 0027 0 0008 0 0037 0 0008 0 0055 0 0008 0 0079 0 0008 0 2362 0 3937 0 0024 0 0010 0 0033 0 0010 0 0045 0 0010 0 0069 0 0010 0 0096 0 0010 0 3937 0 7087 0 0030 0 0013 0 0040 0 0013 0 0056 0 0013 0 0083 0 0013 0 0119 0 0013 0 7087 1 1811 0 0036 0 0016 0 0049 0 0016 0 0067 0 0016 0 0098 0 0016 0 0146 0 0016 1 1811 1 9685 0 0044 0 0020 0 0059 0 0020 0 0083 0 0020 0 0118 0 0020 0 0173 0 0020 1 9685 3 1496 0 0053 0 0024 0 0071 0 0024 0 0098 0 0024 0 0142 0 0024 0 0205 0 0024 3 1496 4 7244 0 0063 0 0028 0 0083 0 0028 0 0115 0 0028 0 0166 0 0028 0 0241 0 0028 4 7244 7 0866 0 0073 0 0033 0 0096 0 0033 0 0132 0 0033 0 0191 0 0033 0 0281 0 0033 7 0866 9 8425 0 0085 0 0039 0 0112 0 0039 0 0154 0 0039 0 0220 0 0039 0 0323 0 0039 9 8425 12 4016 0 0094 0 0043 0 0126 0 0043 0 0169 0 0043 0 0248 0 0043 0 0362 0 0043 12 4016 15 7480 0 0104 0 0049 0 0140 0 0049 0 0191 0 0049 0 0274 0 0049 0 0400 0 0049 15 7480 19 6850 0 0114 0 0053 0 0152 0 0053 0 0211 0 0053 0 0301 0 0053 0 0435 0 0053 Deviations in inches Diameters inches F5 F6 F7 F8 high low high low high low high low 0 1181 0 2362 0 0006 0 0004 0 0007 0 0004 0 0009 0 0004 0 0011 0 0004 0 2362 0 3937 0 0007 0 0005 0 0009 0 0005 0 0011 0 0005 0 0014 0 0005 0 3937 0 7087 0 0009 0 0006 0 0011 0 0006 0 0013 0 0006 0 0017 0 0006 0 7087 1 1811 0 0011 0 0008 0 0013 0 0008 0 0016 0 0008 0 0021 0 0008 1 1811 1 9685 0 0014 0 0010 0 0016 0 0010 0 0020 0 0010 0 0025 0 0010 1 9685 3 1496 0 0017 0 0012 0 0019 0 0012 0 0024 0 0012 0 0030 0 0012 3 1496 4 7244 0 0020 0 0014 0 0023 0 0014 0 0028 0 0014 0 0035 0 0014 4 7244 7 0866 0 0024 0 0017 0 0027 0 0017 0 0033 0 0017 0 0042 0 0017 7 0866 9 8425 0 0028 0 0020 0 0031 0 0020 0 0038 0 0020 0 0048 0 0020 9 8425 12 4016 0 0031 0 0022 0 0035 0 0022 0 0043 0 0022 0 0054 0 0022 12 4016 15 7480 0 0034 0 0024 0 0039 0 0024 0 0047 0 0024 0 0059 0 0024 15 7480 19 6850 0 0037 0 0027 0 0043 0 0027 0 0052 0 0027 0 0065 0 0027 ISO TOLERANCES FOR HOLES INCH BeAring TOLERANCES INCH METRIC continued Engineering A A68 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A69 A68 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A69 ISO TOLERANCES FOR HOLES INCH Deviations in inches Diameters inches G5 G6 G7 high low high low high low 0 1181 0 2362 0 0004 0 0002 0 0005 0 0002 0 0006 0 0002 0 2362 0 3937 0 0004 0 0002 0 0006 0 0002 0 0008 0 0002 0 3937 0 7087 0 0006 0 0002 0 0007 0 0002 0 0009 0 0002 0 7087 1 1811 0 0006 0 0003 0 0008 0 0003 0 0011 0 0003 1 1811 1 9685 0 0008 0 0004 0 0010 0 0004 0 0013 0 0004 1 9685 3 1496 0 0009 0 0004 0 0011 0 0004 0 0016 0 0004 3 1496 4 7244 0 0011 0 0005 0 0013 0 0005 0 0019 0 0005 4 7244 7 0866 0 0013 0 0006 0 0015 0 0006 0 0021 0 0006 7 0866 9 8425 0 0014 0 0006 0 0017 0 0006 0 0024 0 0006 9 8425 12 4016 0 0016 0 0007 0 0019 0 0007 0 0027 0 0007 12 4016 15 7480 0 0017 0 0007 0 0021 0 0007 0 0030 0 0007 15 7480 19 6850 0 0019 0 0008 0 0024 0 0008 0 0033 0 0008 Deviations in inches Diameters inches H4 H5 H6 H7 H8 high low high low high low high low high low 0 1181 0 2362 0 0002 0 0 0002 0 0 0003 0 0 0005 0 0 0007 0 0 2362 0 3937 0 0002 0 0 0002 0 0 0004 0 0 0006 0 0 0009 0 0 3937 0 7087 0 0002 0 0 0003 0 0 0004 0 0 0007 0 0 0011 0 0 7087 1 1811 0 0002 0 0 0004 0 0 0005 0 0 0008 0 0 0013 0 1 1811 1 9685 0 0003 0 0 0004 0 0 0006 0 0 0010 0 0 0015 0 1 9685 3 1496 0 0003 0 0 0005 0 0 0007 0 0 0012 0 0 0018 0 3 1496 4 7244 0 0004 0 0 0006 0 0 0009 0 0 0014 0 0 0021 0 4 7244 7 0866 0 0005 0 0 0007 0 0 0010 0 0 0016 0 0 0025 0 7 0866 9 8425 0 0006 0 0 0008 0 0 0011 0 0 0018 0 0 0028 0 9 8425 12 4016 0 0006 0 0 0009 0 0 0013 0 0 0020 0 0 0032 0 12 4016 15 7480 0 0007 0 0 0010 0 0 0014 0 0 0022 0 0 0035 0 15 7480 19 6850 0 0008 0 0 0011 0 0 0016 0 0 0025 0 0 0038 0 Deviations in inches Diameters inches H9 H10 H11 H12 high low high low high low high low 0 1181 0 2362 0 0012 0 0 0019 0 0 0030 0 0 0047 0 0 2362 0 3937 0 0014 0 0 0023 0 0 0035 0 0 0059 0 0 3937 0 7087 0 0017 0 0 0028 0 0 0043 0 0 0071 0 0 7087 1 1811 0 0020 0 0 0033 0 0 0051 0 0 0083 0 1 1811 1 9685 0 0024 0 0 0039 0 0 0063 0 0 0098 0 1 9685 3 1496 0 0029 0 0 0047 0 0 0075 0 0 0118 0 3 1496 4 7244 0 0034 0 0 0055 0 0 0087 0 0 0138 0 4 7244 7 0866 0 0039 0 0 0063 0 0 0098 0 0 0157 0 7 0866 9 8425 0 0045 0 0 0073 0 0 0114 0 0 0181 0 9 8425 12 4016 0 0051 0 0 0083 0 0 0126 0 0 0205 0 12 4016 15 7480 0 0055 0 0 0091 0 0 0142 0 0 0224 0 15 7480 19 6850 0 0061 0 0 0098 0 0 0157 0 0 0248 0 BeAring TOLERANCES INCH METRIC continued A68 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A69 Engineering A A68 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A69 Deviations in inches Deviations in inches Diameters inches J6 J7 J8 K6 K7 K8 high low high low high low high low high low high low 0 1181 0 2362 0 00020 0 00012 0 00024 0 00024 0 00039 0 00031 0 00008 0 00024 0 00012 0 00035 0 00020 0 00051 0 2362 0 3937 0 00020 0 00016 0 00031 0 00028 0 00047 0 00039 0 00008 0 00028 0 00020 0 00039 0 00024 0 00063 0 3937 0 7087 0 00024 0 00020 0 00039 0 00031 0 00059 0 00047 0 00008 0 00035 0 00024 0 00047 0 00031 0 00075 0 7087 1 1811 0 00031 0 00020 0 00047 0 00035 0 00079 0 00051 0 00008 0 00043 0 00024 0 00059 0 00039 0 00091 1 1811 1 9685 0 00039 0 00024 0 00055 0 00043 0 00094 0 00059 0 00012 0 00051 0 00028 0 00071 0 00047 0 00106 1 9685 3 1496 0 00051 0 00024 0 00071 0 00047 0 00110 0 00071 0 00016 0 00059 0 00035 0 00083 0 00055 0 00126 3 1496 4 7244 0 00063 0 00024 0 00087 0 00051 0 00134 0 00079 0 00016 0 00071 0 00039 0 00098 0 00063 0 00150 4 7244 7 0866 0 00071 0 00028 0 00102 0 00055 0 00161 0 00087 0 00016 0 00083 0 00047 0 00110 0 00079 0 00169 7 0866 9 8425 0 00087 0 00028 0 00118 0 00063 0 00185 0 00098 0 00020 0 00094 0 00051 0 00130 0 00087 0 00197 9 8425 12 4016 0 00098 0 00028 0 00142 0 00063 0 00217 0 00102 0 00020 0 00106 0 00063 0 00142 0 00098 0 00220 12 4016 15 7480 0 00114 0 00028 0 00154 0 00071 0 00236 0 00114 0 00028 0 00114 0 00067 0 00157 0 00110 0 00240 15 7480 19 6850 0 00130 0 00028 0 00169 0 00079 0 00259 0 00122 0 00031 0 00126 0 00071 0 00177 0 00114 0 00268 Deviations in inches Deviations in inches Diameters inches M5 M6 M7 N6 N7 N8 high low high low high low high low high low high low 0 1181 0 2362 0 00012 0 00031 0 00004 0 00035 0 0 00047 0 0002 0 0005 0 0002 0 0006 0 0001 0 0008 0 2362 0 3937 0 00016 0 00039 0 00012 0 00047 0 0 00059 0 0003 0 0006 0 0002 0 0007 0 0001 0 0010 0 3937 0 7087 0 00016 0 00047 0 00016 0 00059 0 0 00071 0 0004 0 0008 0 0002 0 0009 0 0001 0 0012 0 7087 1 1811 0 00020 0 00055 0 00016 0 00067 0 0 00083 0 0004 0 0009 0 0003 0 0011 0 0001 0 0014 1 1811 1 9685 0 00020 0 00063 0 00016 0 00079 0 0 00098 0 0005 0 0011 0 0003 0 0013 0 0001 0 0017 1 9685 3 1496 0 00024 0 00075 0 00020 0 00094 0 0 00118 0 0006 0 0013 0 0004 0 0015 0 0002 0 0020 3 1496 4 7244 0 00031 0 00091 0 00024 0 00110 0 0 00138 0 0006 0 0015 0 0004 0 0018 0 0002 0 0023 4 7244 7 0866 0 00035 0 00106 0 00031 0 00130 0 0 00157 0 0008 0 0018 0 0005 0 0020 0 0002 0 0026 7 0866 9 8425 0 00043 0 00122 0 00031 0 00146 0 0 00181 0 0009 0 0020 0 0006 0 0024 0 0002 0 0030 9 8425 12 4016 0 00051 0 00142 0 00035 0 00161 0 0 00205 0 0000 0 0022 0 0006 0 0026 0 0002 0 0034 12 4016 15 7480 0 00055 0 00154 0 00039 0 00181 0 0 00224 0 0010 0 0024 0 0006 0 0029 0 0002 0 0037 15 7480 19 6850 0 00063 0 00169 0 00039 0 00197 0 0 00248 0 0011 0 0026 0 0007 0 0031 0 0002 0 0041 Deviations in inches Deviations in inches Diameters inches P6 P7 R6 R7 R8 high low high low high low high low high low 0 1181 0 2362 0 0004 0 0007 0 0003 0 0008 0 0005 0 0008 0 0004 0 0009 0 0006 0 0013 0 2362 0 3937 0 0005 0 0008 0 0004 0 0009 0 0006 0 0010 0 0005 0 0011 0 0007 0 0016 0 3937 0 7087 0 0006 0 0010 0 0004 0 0011 0 0008 0 0012 0 0006 0 0013 0 0009 0 0020 0 7087 1 1811 0 0007 0 0012 0 0006 0 0014 0 0009 0 0015 0 0008 0 0016 0 0011 0 0024 1 1811 1 9685 0 0008 0 0015 0 0007 0 0017 0 0011 0 0018 0 0010 0 0020 0 001 3 0 0029 1 9685 2 5591 0 0010 0 0018 0 0008 0 0020 0 0014 0 0021 0 0012 0 0024 0 0016 0 0034 2 5591 3 1496 0 0010 0 0018 0 0008 0 0020 0 0015 0 0022 0 0013 0 0024 0 0017 0 0035 3 1496 3 9370 0 0012 0 0020 0 0009 0 0023 0 0017 0 0026 0 0015 0 0029 0 0020 0 0041 3 9370 4 7244 0 0012 0 0020 0 0009 0 0023 0 0019 0 0027 0 0016 0 0030 0 0021 0 0043 4 7244 5 5118 0 0014 0 0024 0 0011 0 0027 0 0022 0 0032 0 0019 0 0035 0 0025 0 0050 5 5118 6 2992 0 0014 0 0024 0 0011 0 0027 0 0023 0 0033 0 0020 0 0035 0 0026 0 0050 6 2992 7 0866 0 0014 0 0024 0 0011 0 0027 0 0024 0 0034 0 0021 0 0037 0 0027 0 0052 7 0866 7 8740 0 0016 0 0028 0 0013 0 0031 0 0027 0 0038 0 0024 0 0042 0 0030 0 0059 7 8740 8 8583 0 0016 0 0028 0 0013 0 0031 0 0028 0 0039 0 0025 0 0043 0 0031 0 0060 8 8583 9 8425 0 0016 0 0028 0 0013 0 0031 0 0030 0 0041 0 0026 0 0044 0 0033 0 0061 9 8425 11 0236 0 0019 0 0031 0 0014 0 0035 0 0033 0 0046 0 0029 0 0050 0 0037 0 0069 11 0236 12 4016 0 0019 0 0031 0 0014 0 0035 0 0035 0 0048 0 0031 0 0051 0 0039 0 0070 12 4016 13 9764 0 0020 0 0034 0 0016 0 0039 0 0038 0 0052 0 0034 0 0057 0 0043 0 0078 13 9764 15 7480 0 0020 0 0034 0 0016 0 0039 0 0041 0 0055 0 0037 0 0059 0 0045 0 0080 15 7480 17 7165 0 0022 0 0037 0 0018 0 0043 0 0044 0 0060 0 0041 0 0065 0 0050 0 0088 17 7165 19 6850 0 0022 0 0037 0 0018 0 0043 0 0047 0 0063 0 0043 0 0068 0 0052 0 0090 ISO TOLERANCES FOR HOLES INCH BeAring TOLERANCES INCH METRIC continued Engineering A A70 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A71 A70 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A71 Deviations in inches Diameters inches a10 a11 a12 a13 high low high low high low high low 0 1181 0 0106 0 0122 0 0106 0 0130 0 0106 0 0146 0 0106 0 0161 0 1181 0 2362 0 0106 0 0125 0 0106 0 0136 0 0106 0 0154 0 0106 0 0177 0 2362 0 3937 0 0110 0 0133 0 0110 0 0146 0 0110 0 0169 0 0110 0 0197 0 3937 0 7087 0 0114 0 0142 0 0114 0 0157 0 0114 0 0185 0 0114 0 0220 0 7087 1 1811 0 0118 0 0151 0 0118 0 0169 0 0118 0 0201 0 0118 0 0248 1 1811 1 5748 0 0122 0 0161 0 0122 0 0185 0 0122 0 0220 0 0122 0 0276 1 5748 1 9685 0 0126 0 0165 0 0126 0 0189 0 0126 0 0224 0 0126 0 0280 1 9685 2 5591 0 0134 0 0181 0 0134 0 0209 0 0134 0 0252 0 0134 0 0315 2 5591 3 1496 0 0142 0 0189 0 0142 0 0217 0 0142 0 0260 0 0142 0 0323 3 1496 3 9370 0 0150 0 0205 0 0150 0 0236 0 0150 0 0287 0 0150 0 0362 3 9370 4 7244 0 0161 0 0217 0 0161 0 0248 0 0161 0 0299 0 0161 0 0374 4 7244 5 5118 0 0181 0 0244 0 0181 0 0280 0 0181 0 0339 0 0181 0 0429 5 5118 6 2992 0 0205 0 0268 0 0205 0 0303 0 0205 0 0362 0 0205 0 0453 6 2992 7 0866 0 0228 0 0291 0 0228 0 0327 0 0228 0 0386 0 0228 0 0476 7 0866 7 8740 0 0260 0 0333 0 0260 0 0374 0 0260 0 0441 0 0260 0 0543 7 8740 8 8583 0 0291 0 0364 0 0291 0 0406 0 0291 0 0472 0 0291 0 0575 8 8583 9 8425 0 0323 0 0396 0 0323 0 0437 0 0323 0 0504 0 0323 0 0606 9 8425 11 0236 0 0362 0 0445 0 0362 0 0488 0 0362 0 0567 0 0362 0 0681 11 0236 12 4016 0 0413 0 0496 0 0413 0 0539 0 0413 0 0618 0 0413 0 0732 12 4016 13 9764 0 0472 0 0563 0 0472 0 0614 0 0472 0 0697 0 0472 0 0823 13 9764 15 7480 0 0531 0 0622 0 0531 0 0673 0 0531 0 0756 0 0531 0 0882 Deviations in inches Deviations in inches Diameters inches c11 c12 c13 e11 e12 e13 high low high low high low high low high low high low 0 1181 0 0024 0 0047 0 0024 0 0063 0 0024 0 0079 0 0006 0 0029 0 0006 0 0045 0 0006 0 0061 0 1181 0 2362 0 0028 0 0057 0 0028 0 0075 0 0028 0 0098 0 0008 0 0037 0 0008 0 0055 0 0008 0 0079 0 2362 0 3937 0 0031 0 0067 0 0031 0 0091 0 0031 0 0118 0 0010 0 0045 0 0010 0 0069 0 0010 0 0096 0 3937 0 7087 0 0037 0 0081 0 0037 0 0108 0 0037 0 0144 0 0013 0 0056 0 0013 0 0083 0 0013 0 0119 0 7087 1 1811 0 0043 0 0094 0 0043 0 0126 0 0043 0 0173 0 0016 0 0067 0 0016 0 0098 0 0016 0 0146 1 1811 1 5748 0 0047 0 0110 0 0047 0 0146 0 0047 0 0201 0 0020 0 0083 0 0020 0 0118 0 0020 0 0173 1 5748 1 9685 0 0051 0 0114 0 0051 0 0150 0 0051 0 0205 0 0020 0 0083 0 0020 0 0118 0 0020 0 0173 1 9685 2 5591 0 0055 0 0130 0 0055 0 0173 0 0055 0 0236 0 0024 0 0098 0 0024 0 0142 0 0024 0 0205 2 5591 3 1496 0 0059 0 0134 0 0059 0 0177 0 0059 0 0240 0 0024 0 0098 0 0024 0 0142 0 0024 0 0205 3 1496 3 9370 0 0067 0 0154 0 0067 0 0205 0 0067 0 0280 0 0028 0 0115 0 0028 0 0166 0 0028 0 0241 3 9370 4 7244 0 0071 0 0157 0 0071 0 0209 0 0071 0 0283 0 0028 0 0115 0 0028 0 0166 0 0028 0 0241 4 7244 5 5118 0 0079 0 0177 0 0079 0 0236 0 0079 0 0327 0 0033 0 0132 0 0033 0 0191 0 0033 0 0281 5 5118 6 2992 0 0083 0 0181 0 0083 0 0240 0 0083 0 0331 0 0033 0 0132 0 0033 0 0191 0 0033 0 0281 6 2992 7 0866 0 0091 0 0189 0 0091 0 0248 0 0091 0 0339 0 0033 0 0132 0 0033 0 0191 0 0033 0 0281 7 0866 7 8740 0 0094 0 0209 0 0094 0 0276 0 0094 0 0378 0 0039 0 0154 0 0039 0 0220 0 0039 0 0323 7 8740 8 8583 0 0102 0 0217 0 0102 0 0283 0 0102 0 0386 0 0039 0 0154 0 0039 0 0220 0 0039 0 0323 8 8583 9 8425 0 0110 0 0224 0 0110 0 0291 0 0110 0 0394 0 0039 0 0154 0 0039 0 0220 0 0039 0 0323 9 8425 11 0236 0 0118 0 0244 0 0118 0 0323 0 0118 0 0437 0 0043 0 0169 0 0043 0 0248 0 0043 0 0362 11 0236 12 4016 0 0130 0 0256 0 0130 0 0335 0 0130 0 0449 0 0043 0 0169 0 0043 0 0248 0 0043 0 0362 12 4016 13 9764 0 0142 0 0283 0 0142 0 0366 0 0142 0 0492 0 0049 0 0191 0 0049 0 0274 0 0049 0 0400 13 9764 15 7480 0 0157 0 0299 0 0157 0 0382 0 0157 0 0508 0 0049 0 0191 0 0049 0 0274 0 0049 0 0400 ISO TOLERANCES FOR SHAFTS INCH BeAring TOLERANCES INCH METRIC continued A70 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A71 Engineering A A70 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A71 Deviations in inches Deviations in inches Diameters inches f5 f6 f7 g5 g6 g7 high low high low high low high low high low high low 0 1181 0 0002 0 0004 0 0002 0 0005 0 0002 0 0006 0 0001 0 0002 0 0001 0 0003 0 0001 0 0005 0 1181 0 2362 0 0004 0 0006 0 0004 0 0007 0 0004 0 0009 0 0002 0 0004 0 0002 0 0005 0 0002 0 0006 0 2362 0 3937 0 0005 0 0007 0 0005 0 0009 0 0005 0 0011 0 0002 0 0004 0 0002 0 0006 0 0002 0 0008 0 3937 0 7087 0 0006 0 0009 0 0006 0 0011 0 0006 0 0013 0 0002 0 0006 0 0002 0 0007 0 0002 0 0009 0 7087 1 1811 0 0008 0 0011 0 0008 0 0013 0 0008 0 0016 0 0003 0 0006 0 0003 0 0008 0 0003 0 0011 1 1811 1 9685 0 0010 0 0014 0 0010 0 0016 0 0010 0 0020 0 0004 0 0008 0 0004 0 0010 0 0004 0 0013 1 9685 3 1496 0 0012 0 0017 0 0012 0 0019 0 0012 0 0024 0 0004 0 0009 0 0004 0 0011 0 0004 0 0016 3 1496 4 7244 0 0014 0 0020 0 0014 0 0023 0 0014 0 0028 0 0005 0 0011 0 0005 0 0013 0 0005 0 0019 4 7244 7 0866 0 0017 0 0024 0 0017 0 0027 0 0017 0 0033 0 0006 0 0013 0 0006 0 0015 0 0006 0 0021 7 0866 9 8425 0 0020 0 0028 0 0020 0 0031 0 0020 0 0038 0 0006 0 0014 0 0006 0 0017 0 0006 0 0024 9 8425 12 4016 0 0022 0 0031 0 0022 0 0035 0 0022 0 0043 0 0007 0 0016 0 0007 0 0019 0 0007 0 0027 12 4016 15 7480 0 0024 0 0034 0 0024 0 0039 0 0024 0 0047 0 0007 0 0017 0 0007 0 0021 0 0007 0 0030 Deviations in inches Diameters inches h4 h5 h6 h7 h8 high low high low high low high low high low 0 1181 0 0 00012 0 0 00016 0 0 00024 0 0 0004 0 0 0006 0 1181 0 2362 0 0 00016 0 0 00020 0 0 00031 0 0 0005 0 0 0007 0 2362 0 3937 0 0 0002 0 0 00024 0 0 0004 0 0 0006 0 0 0009 0 3937 0 7087 0 0 0002 0 0 00031 0 0 0004 0 0 0007 0 0 0011 0 7087 1 1811 0 0 0002 0 0 0004 0 0 0005 0 0 0008 0 0 0013 1 1811 1 9685 0 0 0003 0 0 0004 0 0 0006 0 0 0010 0 0 0015 1 9685 3 1496 0 0 0003 0 0 0005 0 0 0007 0 0 0012 0 0 0018 3 1496 4 7244 0 0 0004 0 0 0006 0 0 0009 0 0 0014 0 0 0021 4 7244 7 0866 0 0 0005 0 0 0007 0 0 0010 0 0 0016 0 0 0025 7 0866 9 8425 0 0 0006 0 0 0008 0 0 0011 0 0 0018 0 0 0028 9 8425 12 4016 0 0 0006 0 0 0009 0 0 0013 0 0 0020 0 0 0032 12 4016 15 7480 0 0 0007 0 0 0010 0 0 0014 0 0 0022 0 0 0035 Deviations in inches Diameters inches h9 h10 h11 h12 h13 high low high low high low high low high low 0 1181 0 0 0010 0 0 0016 0 0 0024 0 0 0039 0 0 0055 0 1181 0 2362 0 0 0012 0 0 0019 0 0 0030 0 0 0047 0 0 0071 0 2362 0 3937 0 0 0014 0 0 0023 0 0 0035 0 0 0059 0 0 0087 0 3937 0 7087 0 0 0017 0 0 0028 0 0 0043 0 0 0071 0 0 0106 0 7087 1 1811 0 0 0020 0 0 0033 0 0 0051 0 0 0083 0 0 0130 1 1811 1 9685 0 0 0024 0 0 0039 0 0 0063 0 0 0098 0 0 0154 1 9685 3 1496 0 0 0029 0 0 0047 0 0 0075 0 0 0118 0 0 0181 3 1496 4 7244 0 0 0034 0 0 0055 0 0 0087 0 0 0138 0 0 0213 4 7244 7 0866 0 0 0039 0 0 0063 0 0 0098 0 0 0157 0 0 0248 7 0866 9 8425 0 0 0045 0 0 0073 0 0 0114 0 0 0181 0 0 0283 9 8425 12 4016 0 0 0051 0 0 0083 0 0 0126 0 0 0205 0 0 0319 12 4016 15 7480 0 0 0055 0 0 0091 0 0 0142 0 0 0224 0 0 0350 ISO TOLERANCES FOR SHAFTS INCH BeAring TOLERANCES INCH METRIC continued Engineering A A72 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A73 A72 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A73 Deviations in inches Deviations in inches Diameters inches j5 j6 j7 k5 k6 k7 high low high low high low high low high low high low 0 1181 0 00008 0 00008 0 00016 0 00008 0 00024 0 00016 0 00016 0 0 00024 0 0 00039 0 0 1181 0 2362 0 00012 0 00008 0 00024 0 00008 0 00031 0 00016 0 00024 0 00004 0 00035 0 00004 0 00051 0 00004 0 2362 0 3937 0 00016 0 00008 0 00028 0 00008 0 00039 0 00020 0 00028 0 00004 0 00039 0 00004 0 00063 0 00004 0 3937 0 7087 0 00020 0 00012 0 00031 0 00012 0 00047 0 00024 0 00035 0 00004 0 00047 0 00004 0 00075 0 00004 0 7087 1 1811 0 00020 0 00016 0 00035 0 00016 0 00051 0 00031 0 00043 0 00008 0 00059 0 00008 0 00091 0 00008 1 1811 1 9685 0 00024 0 00020 0 00043 0 00020 0 00059 0 00039 0 00051 0 00008 0 00071 0 00008 0 00106 0 00008 1 9685 3 1496 0 00024 0 00028 0 00047 0 00028 0 00071 0 00047 0 00059 0 00008 0 00083 0 00008 0 00126 0 00008 3 1496 4 7244 0 00024 0 00035 0 00051 0 00035 0 00079 0 00059 0 00071 0 00012 0 00098 0 00012 0 00150 0 00012 4 7244 7 0866 0 00028 0 00043 0 00055 0 00043 0 00087 0 00071 0 00083 0 00012 0 00110 0 00012 0 00169 0 00012 7 0866 9 8425 0 00028 0 00051 0 00063 0 00051 0 00098 0 00083 0 00094 0 00016 0 00130 0 00016 0 00197 0 00016 9 8425 12 4016 0 00028 0 00063 0 00063 0 00063 0 00102 0 00102 0 00106 0 00016 0 00142 0 00016 0 00220 0 00016 12 4016 15 7480 0 00028 0 00071 0 00071 0 00071 0 00114 0 00110 0 00114 0 00016 0 00157 0 00016 0 00240 0 00016 Deviations in inches Deviations in inches Diameters inches m5 m6 m7 n5 n6 n7 high low high low high low high low high low high low 0 1181 0 00024 0 00008 0 00031 0 00008 0 00047 0 00008 0 0003 0 0002 0 0004 0 0002 0 0006 0 0002 0 1181 0 2362 0 00035 0 00016 0 00047 0 00016 0 00063 0 00016 0 0005 0 0003 0 0006 0 0003 0 0008 0 0003 0 2362 0 3937 0 00047 0 00024 0 00059 0 00024 0 00083 0 00024 0 0006 0 0004 0 0007 0 0004 0 0010 0 0004 0 3937 0 7087 0 00059 0 00028 0 00071 0 00028 0 00098 0 00028 0 0008 0 0005 0 0009 0 0005 0 0012 0 0005 0 7087 1 1811 0 00067 0 00031 0 00083 0 00031 0 00114 0 00031 0 0009 0 0006 0 0011 0 0006 0 0014 0 0006 1 1811 1 9685 0 00079 0 00035 0 00098 0 00035 0 00134 0 00035 0 0011 0 0007 0 0013 0 0007 0 0017 0 0007 1 9685 3 1496 0 00094 0 00043 0 00118 0 00043 0 00161 0 00043 0 0013 0 0008 0 0015 0 0008 0 0020 0 0008 3 1496 4 7244 0 00110 0 00051 0 00138 0 00051 0 00189 0 00051 0 0015 0 0009 0 0018 0 0009 0 0023 0 0009 4 7244 7 0866 0 00130 0 00059 0 00157 0 00059 0 00217 0 00059 0 0018 0 0011 0 0020 0 0011 0 0026 0 0011 7 0866 9 8425 0 00146 0 00067 0 00181 0 00067 0 00248 0 00067 0 0020 0 0012 0 0024 0 0012 0 0030 0 0012 9 8425 12 4016 0 00169 0 00079 0 00205 0 00079 0 00283 0 00079 0 0022 0 0013 0 0026 0 0013 0 0034 0 0013 12 4016 15 7480 0 00181 0 00083 0 00224 0 00083 0 00307 0 00083 0 0024 0 0015 0 0029 0 0015 0 0037 0 0015 Deviations in inches Diameters inches p6 r6 r7 high low high low high low 0 1181 0 2362 0 2362 0 3937 0 3937 0 7087 0 7087 1 1811 1 1811 1 9685 1 9685 2 5591 2 5591 3 1496 3 1496 3 9370 0 0023 0 0015 3 9370 4 7244 0 0023 0 0015 4 7244 5 5118 0 0027 0 0017 0 0035 0 0026 5 5118 6 2992 0 0027 0 0017 0 0035 0 0026 6 2992 7 0866 0 0027 0 0017 0 0035 0 0026 7 0866 7 8740 0 0031 0 0020 0 0042 0 0030 7 8740 8 8583 0 0031 0 0020 0 0043 0 0031 0 0050 0 0031 8 8583 9 8425 0 0031 0 0020 0 0044 0 0033 0 0051 0 0033 9 8425 11 0236 0 0035 0 0022 0 0050 0 0037 0 0057 0 0037 11 0236 12 4016 0 0035 0 0022 0 0051 0 0039 0 0059 0 0039 12 4016 13 9764 0 0039 0 0024 0 0057 0 0043 0 0065 0 0043 13 9764 15 7480 0 0039 0 0024 0 0059 0 0045 0 0067 0 0045 15 7480 17 7165 0 0043 0 0027 0 0065 0 0050 0 0074 0 0050 17 7165 19 6850 0 0043 0 0027 0 0068 0 0052 0 0077 0 0052 ISO TOLERANCES FOR SHAFTS INCH BeAring TOLERANCES INCH METRIC continued A72 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A73 Engineering A A72 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A73 Mounting designs Correct bearing mounting and fitting practices are key components of proper bearing setting Setting is the amount of clearance or interference within a mounted bearing Bearing internal clearance is affected by the tightness of the fit to the inner and outer races Proper bearing setting is crucial to bearing life and performance Although clearance is required for most mounted bearings application dependant factors include load speed bearing position installation method materials of construction runout accuracy thermal considerations hoop stress and shaft and housing design This section provides tables and discussion to aid in selection of the proper bearing mounting and fitting procedures to optimize performance in general applications For special applications please consult your Timken representative for review radial ball bearings In the manufacture of rolling element bearings it is standard practice to assemble rings and rolling elements with a specified internal clearance This characteristic is necessary to absorb the effect of press fitting the bearing rings at mounting Internal clearance is sometimes utilized to compensate for thermal expansion of bearings shafts and housings or to provide a contact angle in the bearing after mounting Internal clearance can be measured either by gaging radially or axially Radial measurement is accepted as the more significant characteristic for most bearing types because it is more directly related to shaft and housing fits It also is the method prescribed by the American Bearing Manufacturers Association ABMA However tapered roller bearings and duplex sets of angular contact ball bearings are usually set axially The radial internal clearance RIC of a radial contact ball bearing can be defined as the average outer ring raceway diameter minus the average inner ring raceway diameter minus twice the ball diameter RIC can be measured mechanically by moving the outer ring horizontally as pictured in Figure A 12 The total movement of the outer ring when the balls are properly seated in the raceways determines the RIC Several readings should be taken using different circumferential orientations of the rings in order to get a comprehensive average reading Fig A 12 A B The Timken Company radial clearance designations correlate with ABMA symbols as follows Bearing Number ABMA Prefix Symbol Description H 2 Snug slight internal clearance sometimes used to achieve a minimum of radial or axial play in an assembly Example H204K R 0 Medium internal clearance generally satisfactory with suggested shaft and housing fits Example RMM204K P 3 Loose considerable internal clearance required for applications involving press fits on both inner and outer rings extra interference fits or temperature differentials Example P204K J 4 Extra Loose large amount of internal clearance for applications involving large interference fits or temperature differentials Example J204K JJ 5 Extra Extra Loose extra large amount of internal clearance for applications with large temperature differential and interference fits on both rings Endplay Endplay is an alternate method of measuring internal clearance and is rarely used except for certain special applications Endplay is determined by mounting the bearing as shown in Figure A 13 with one of its rings clamped to prevent axial movement A reversing measuring load is applied to the unclamped ring so that the resultant movement of that ring is parallel to the bearing axis Endplay is the total movement of the unclamped ring when the load is applied first in one direction and then in the other When the inner and outer ring raceway curvatures are accurately known the free endplay can readily be calculated from the values of no load radial clearance by the following formula E 4dRD KO Ki 1 RD 2 or 4dRD KO Ki 1 Where RD 2 is generally a very small value and can be omitted for most calculations without introducing undue inaccuracy E Free endplay where KO outer race contour radius expressed as a decimal fraction of the ball diameter K inner race contour radius expressed as a decimal fraction of the ball diameter RD radial clearance no load d ball diameter Fig A 13 Engineering A A74 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A75 A74 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A75 Limits for radial internal clearance of single row radial contact ball bearings under no load Applies to Bearings of ABEC 1 ABEC 3 ABEC 5 ABEC 7 and ABEC 9 Tolerances All tolerances in number of micrometers m and ten thousandths inches 0001 Timken Prefix ABMA designation H C2 R C0 P C3 J C4 JJ C5 Acceptance Limits Acceptance Limits Acceptance Limits Acceptance Limits Acceptance Limit Basic Bore Diameter MM over incl low high low high low high low high low high mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in 2 5 10 0 7 2 13 8 23 14 29 2 0 37 0 3 1 5 3 9 6 11 8 15 10 18 0 9 3 18 11 25 18 33 25 45 0 3 5 1 7 4 10 7 13 10 18 18 24 0 1 0 5 2 0 13 28 2 0 36 28 48 0 4 2 8 5 11 8 14 11 19 24 30 1 11 5 2 0 13 28 23 41 3 0 53 0 5 4 5 2 8 5 11 9 16 12 21 30 40 1 11 6 2 0 15 33 28 46 4 0 64 0 5 4 5 2 8 6 13 11 18 16 25 40 50 1 11 6 23 18 36 3 0 51 45 73 0 5 4 5 2 5 9 7 14 12 20 18 29 50 65 1 15 8 28 23 43 38 61 55 9 0 0 5 6 3 5 11 9 17 15 24 22 35 65 80 1 15 1 0 3 0 25 51 46 71 65 1 05 0 5 6 4 12 10 20 18 28 26 41 80 100 1 18 12 36 3 0 58 53 84 75 12 0 0 5 7 4 5 14 12 23 21 33 30 47 100 120 2 2 0 15 41 36 66 61 97 9 0 140 1 8 6 16 14 26 24 38 35 55 120 140 2 23 18 48 41 81 71 114 1 05 160 1 9 7 19 16 32 28 45 41 63 140 160 2 23 18 53 46 91 81 13 0 120 180 1 9 7 21 18 36 32 51 47 71 160 180 2 25 2 0 61 53 1 02 91 147 135 200 1 10 8 24 21 40 36 58 53 79 180 200 2 3 0 25 71 63 117 1 07 163 150 230 1 12 10 28 25 46 42 64 59 91 200 240 3 36 3 0 81 74 137 127 193 183 267 1 14 12 32 29 54 50 76 72 105 240 280 3 41 33 97 86 157 147 224 213 31 0 1 16 13 38 34 62 58 88 84 122 280 320 5 48 41 114 1 04 18 0 17 0 257 246 353 2 19 16 45 41 71 67 101 97 139 320 370 5 53 46 127 117 2 08 198 295 284 409 2 21 18 50 46 82 78 116 112 161 370 430 8 64 56 147 137 241 231 34 0 330 475 3 25 22 58 54 95 91 134 130 187 430 500 1 0 74 66 17 0 16 0 279 269 396 386 551 4 29 26 67 63 110 106 156 152 217 500 570 1 0 81 74 193 183 318 3 07 450 439 630 4 32 29 76 72 125 121 177 173 248 570 640 13 91 85 216 2 06 356 345 5 05 495 706 5 36 33 85 81 140 136 199 195 278 640 710 2 0 114 1 07 239 229 394 384 564 554 78 0 8 45 42 94 90 155 151 222 218 307 710 800 2 0 140 13 0 269 259 445 434 63 0 620 879 8 55 51 106 102 175 171 248 244 346 800 1060 28 211 2 01 353 345 587 577 833 823 1148 11 83 79 139 136 231 227 328 324 452 Standard fits for Timken radial ball bearings P C3 for bearing O D greater than 52 mm radial ball bearings mounting designs continued A74 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A75 Engineering A A74 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A75 Contact angle The contact angle is related to internal clearance as follows sin 1 E 2 Ko Ki 1 d The contact angle may also be accurately determined in a production bearing from its pitch diameter P D and by measuring the number of revolutions Nc of the ball and cage assembly relative to rotation Ni of the inner ring under a light thrust load Nc 0 5Ni 1 d cos dm dm Nc cos d 1 0 5Ni The accuracy of this method of measurement depends greatly upon the care taken in set up Balanced weight for thrust loading vertical turning slow turning many turns minimum lubricant of low viscosity and pre rotation are all essential for instance The races should not be radially restrained during the contact angle measurement mounting designs continued Engineering A A76 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A77 A76 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A77 Spherical roller bearing endpla y In certain applications such as vane pumps rubber mill rotor shafts or where it is necessary to take up axial expansion within the bearing knowledge of the bearing endplay relationship to mounted radial internal clearance may be required The following table showing the ratio of approximate endplay to radial internal clearance in spherical roller bearings can be used to calculate approximate endplay in the bearing Example 22320CJW33C3 bearing has a radial internal clearance after installation of 002 The total endplay would be approximately 0086 in 0043 from center Series E P RIC 39 8 7 30 7 0 22 5 5 31 5 0 40 4 8 32 4 4 23 4 3 41 4 2 33 3 9 Radial spherical roller bearings Timken bearing RIC allows a tight fit with sufficient internal clearance after installation for normal operating conditions Spherical roller bearings with tapered bore K require a slightly greater interference fit on the shaft than would a cylindrical bore bearing The effect of this greater interference fit is a reduction of RIC For tapered bore bearings it is critical to select the RIC that allows for this reduction For example bearing number 22328K C3 140 mm bore with C3 clearance is to be mounted on a tapered shaft By feeler gaging RIC is found to be 0 178 mm 0 007 in The chart indicates that the proper fit will be obtained when RIC is reduced by 0 064 to 0 089 mm 0 0025 in to 0 0035 in Clearance after mounting is computed 0 178 0 076 0 102 mm 0 007 in 0 003 in 0 004 in The locknut should be tightened until RIC reaches 0 102 mm 0 004 in Several factors influence RIC reduction Inner rings pressed into solid steel shafts expand approximately 80 percent of the interference fit Outer rings pressed into steel or cast iron housings reduce RIC by about 60 percent of the interference fit For RIC reduction on hollow shafts or non steel materials consult your local Timken representative Timken bearings are supplied with NORMAL RIC unless otherwise specified The desired RIC code must be added to the bearing number FOLLOWING ALL OTHER SUFFIXES Min max values for each RIC are shown in the two adjacent columns directly beneath the selected RIC Each single column represents a boundary between adjacent RICs For example the minimum values shown for C5 are also the maximum values for C4 minimum values for C4 are also the maximum values for C3 etc mounting designs continued A76 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A77 Engineering A A76 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A77 Min Max values for each RIC are shown in the two adjacent columns directly beneath the selected RIC Each single column represents a boundary between adjacent RICs For example the minimum values shown for C5 are also the maximum values for C4 minimum values for C4 are also the maximum values for C3 etc Special clearances can be provided C6 C7 etc For bearings with normal initial clearance radial internal clearance limits RADIAL SPHERICAL ROLLER BEARINGS All data on this page except Bore I D are in millimeters inches Cylindrical Bore Tapered Bore Normal C4 Normal C4 Suggested Suggested C0 C0 Reduction of RIC RIC after Min Max Min Max Min Max Min Max Due to Installation Installation 1 C2 C3 C5 C2 C3 C5 mm Min Max Min Max Min Max Min Max Mmin Max Min Max Min Max Min mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm over incl inch inch inch inch inch inch inch inch inch inch inch inch inch inch inch 24 30 0 015 0 025 0 040 0 055 0 075 0 095 0 020 0 030 0 040 0 055 0 075 0 095 0 015 0 020 0 015 0 0006 0 0010 0 0016 0 0022 0 0030 0 0037 0 0008 0 0012 0 0016 0 0022 0 0030 0 0037 0 0006 0 0008 0 0006 30 40 0 015 0 030 0 045 0 060 0 080 1 000 0 025 0 035 0 050 0 065 0 085 0 105 0 020 0 025 0 015 0 0006 0 0012 0 0018 0 0024 0 0031 0 0039 0 0010 0 0014 0 0020 0 0026 0 0033 0 0041 0 0008 0 0010 0 0006 40 50 0 020 0 035 0 055 0 075 0 100 0 125 0 030 0 045 0 060 0 080 0 100 0 130 0 025 0 030 0 020 0 0008 0 0014 0 0022 0 0030 0 0039 0 0049 0 0012 0 0018 0 0024 0 0031 0 0039 0 0051 0 0010 0 0012 0 0008 50 65 0 020 0 040 0 065 0 090 0 120 0 150 0 040 0 055 0 075 0 095 0 120 0 160 0 030 0 038 0 025 0 0008 0 0016 0 0026 0 0035 0 0047 0 0059 0 0016 0 0022 0 0030 0 0037 0 0047 0 0063 0 0012 0 0015 0 0010 65 80 0 030 0 050 0 080 0 110 0 145 0 180 0 050 0 070 0 095 0 120 0 150 0 200 0 038 0 051 0 025 0 0012 0 0020 0 0031 0 0043 0 0057 0 0071 0 0020 0 0028 0 0037 0 0047 0 0059 0 0079 0 0015 0 0020 0 0010 80 100 0 035 0 060 0 100 0 135 0 180 0 225 0 055 0 080 0 110 0 140 0 180 0 230 0 046 0 064 0 036 0 0014 0 0024 0 0039 0 0053 0 0071 0 0089 0 0022 0 0030 0 0043 0 0055 0 0071 0 0091 0 0018 0 0025 0 0014 100 120 0 040 0 075 0 120 0 160 0 210 0 260 0 065 0 100 0 135 0 170 0 220 0 280 0 051 0 071 0 051 0 0016 0 0030 0 0047 0 0063 0 0083 0 0102 0 0026 0 0039 0 0053 0 0067 0 0087 0 0110 0 0020 0 0028 0 0020 120 140 0 050 0 095 0 145 0 190 0 240 0 300 0 080 0 120 0 160 0 200 0 260 0 330 0 064 0 089 0 056 0 0020 0 0037 0 0057 0 0075 0 0094 0 0118 0 0031 0 0047 0 0063 0 0079 0 0102 0 0130 0 0025 0 0035 0 0022 140 160 0 060 0 110 0 170 0 220 0 280 0 350 0 090 0 130 0 180 0 230 0 300 0 380 0 076 0 102 0 056 0 0024 0 0043 0 0067 0 0087 0 0110 0 0138 0 0035 0 0051 0 0071 0 0091 0 0118 0 0150 0 0030 0 0040 0 0022 160 180 0 065 0 120 0 180 0 240 0 310 0 390 0 100 0 140 0 200 0 260 0 340 0 430 0 076 0 114 0 061 0 0026 0 0047 0 0071 0 0094 0 0122 0 0154 0 0039 0 0055 0 0079 0 0102 0 0134 0 0169 0 0030 0 0045 0 0024 180 200 0 070 0 130 0 200 0 260 0 340 0 430 0 110 0 160 0 220 0 290 0 370 0 470 0 089 0 127 0 071 0 0028 0 0051 0 0079 0 0102 0 0134 0 0169 0 0043 0 0063 0 0087 0 0114 0 0146 0 0185 0 0035 0 0050 0 0028 200 225 0 080 0 140 0 220 0 290 0 380 0 470 0 120 0 180 0 250 0 320 0 410 0 520 0 102 0 140 0 076 0 0031 0 0055 0 0087 0 0114 0 0150 0 0185 0 0047 0 0071 0 0098 0 0126 0 0161 0 0205 0 0040 0 0055 0 0030 225 250 0 090 0 150 0 240 0 320 0 420 0 520 0 140 0 200 0 270 0 350 0 450 0 570 0 114 0 152 0 089 0 0035 0 0059 0 0094 0 0126 0 0165 0 0205 0 0055 0 0079 0 0106 0 0138 0 0177 0 0224 0 0045 0 0060 0 0035 250 280 0 100 0 170 0 260 0 350 0 460 0 570 0 150 0 220 0 300 0 390 0 490 0 620 0 114 0 165 0 102 0 0039 0 0067 0 0102 0 0138 0 0181 0 0224 0 0059 0 0087 0 0118 0 0154 0 0193 0 0244 0 0045 0 0065 0 0040 280 315 0 110 0 190 0 280 0 370 0 500 0 630 0 170 0 240 0 330 0 430 0 540 0 680 0 127 0 178 0 102 0 0043 0 0075 0 0110 0 0146 0 0197 0 0248 0 0067 0 0094 0 0130 0 0169 0 0213 0 0268 0 0050 0 0070 0 0040 315 355 0 120 0 200 0 310 0 410 0 550 0 690 0 190 0 270 0 360 0 470 0 590 0 740 0 140 0 190 0 114 0 0047 0 0079 0 0122 0 0161 0 0217 0 0272 0 0075 0 0106 0 0142 0 0185 0 0232 0 0291 0 0055 0 0075 0 0045 355 400 0 130 0 220 0 340 0 450 0 600 0 750 0 210 0 300 0 400 0 520 0 650 0 820 0 152 0 203 0 127 0 0051 0 0087 0 0134 0 0177 0 0236 0 0295 0 0083 0 0118 0 0157 0 0205 0 0256 0 0323 0 0060 0 0080 0 0050 400 450 0 140 0 240 0 370 0 500 0 660 0 820 0 230 0 330 0 440 0 570 0 720 0 910 0 165 0 216 0 152 0 0055 0 0094 0 0146 0 0197 0 0260 0 0323 0 0091 0 0130 0 0173 0 0224 0 0283 0 0358 0 0065 0 0085 0 0060 450 500 0 140 0 260 0 410 0 550 0 720 0 900 0 260 0 370 0 490 0 630 0 790 1 000 0 178 0 229 0 165 0 0055 0 0102 0 0161 0 0217 0 0283 0 0354 0 0102 0 0146 0 0193 0 0248 0 0311 0 0394 0 0070 0 0090 0 0065 500 560 0 150 0 280 0 440 0 600 0 780 1 000 0 290 0 410 0 540 0 680 0 870 1 100 0 203 0 254 0 178 0 0059 0 0110 0 0173 0 0236 0 0307 0 0394 0 0114 0 0161 0 0213 0 0268 0 0343 0 0433 0 0080 0 0100 0 0070 560 630 0 170 0 310 0 480 0 650 0 850 1 100 0 320 0 460 0 600 0 760 0 980 1 230 0 229 0 279 0 203 0 0067 0 0122 0 0189 0 0256 0 0335 0 0433 0 0126 0 0181 0 0236 0 0299 0 0386 0 0484 0 0090 0 0110 0 0080 630 710 0 190 0 350 0 530 0 700 0 920 1 190 0 350 0 510 0 670 0 850 1 090 1 360 0 254 0 305 0 203 0 0075 0 0138 0 0209 0 0276 0 0362 0 0469 0 0138 0 0201 0 0264 0 0335 0 0429 0 0535 0 0100 0 0120 0 0080 710 800 0 210 0 390 0 580 0 770 1 010 1 300 0 390 0 570 0 750 0 960 1 220 1 500 0 279 0 356 0 229 0 0083 0 0154 0 0228 0 0303 0 0398 0 0512 0 0154 0 0224 0 0295 0 0378 0 0480 0 0591 0 0110 0 0140 0 0090 800 900 0 230 0 430 0 650 0 860 1 120 1 440 0 440 0 640 0 840 1 070 1 370 1 690 0 305 0 381 0 252 0 0091 0 0169 0 0256 0 0339 0 0441 0 0567 0 0173 0 0252 0 0331 0 0421 0 0539 0 0665 0 0120 0 0150 0 0100 900 1000 0 260 0 480 0 710 0 930 1 220 1 57 0 490 0 710 0 930 1 190 1 520 1 860 0 356 0 432 0 279 0 0102 0 0189 0 0280 0 0366 0 0480 0 0618 0 0193 0 0280 0 0366 0 0469 0 0598 0 0732 0 0140 0 0170 0 0110 Bore nominal 1 For bearings with normal initial clearance mounting designs continued Engineering A A78 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A79 A78 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A79 Bore mm R I C 0 0001 inch and m C2 C0 C3 C4 C5 over incl Min Max Min Max Min Max Min Max Min Max mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in 10 0 25 20 45 35 60 50 75 0 10 8 18 14 24 20 30 10 24 0 25 20 45 35 60 50 75 65 90 0 10 8 18 14 24 20 30 26 35 24 30 0 25 20 45 35 60 50 75 70 95 0 10 8 18 14 24 20 30 28 37 30 40 5 30 25 50 45 70 60 85 80 105 2 12 10 20 18 28 24 33 31 41 40 50 5 35 30 60 50 80 70 100 95 125 2 14 12 24 20 31 28 39 37 49 50 65 10 40 40 70 60 90 80 110 110 140 4 16 16 28 24 35 31 43 43 55 65 80 10 45 40 75 65 100 90 125 130 165 4 18 16 30 26 39 35 49 51 65 80 100 15 50 50 85 75 110 105 140 155 190 6 20 20 33 30 43 41 55 61 75 100 120 15 55 50 90 85 125 125 165 180 220 6 22 20 35 33 49 49 65 71 87 120 140 15 60 60 105 100 145 145 190 200 245 6 24 24 41 39 57 57 75 79 96 140 160 20 70 70 120 115 165 165 215 225 275 8 28 28 47 45 65 65 85 89 108 160 180 25 75 75 125 120 170 170 220 250 300 10 30 30 49 47 67 67 87 98 118 180 200 35 90 90 145 140 195 195 250 275 330 14 35 35 57 55 77 77 98 108 130 200 225 45 105 105 165 160 220 220 280 305 365 18 41 41 65 63 87 87 110 120 144 225 250 45 110 110 175 170 235 235 300 330 395 18 43 43 69 67 93 93 118 130 156 250 280 55 125 125 195 190 260 260 330 370 440 22 49 49 77 75 102 102 130 146 173 280 315 55 130 130 205 200 275 275 350 410 485 22 51 51 81 79 108 108 138 161 191 315 355 65 145 145 225 225 305 305 385 455 535 26 57 57 89 89 120 120 152 179 211 355 400 100 190 190 280 280 370 370 460 510 600 39 75 75 110 110 146 146 181 201 236 400 450 110 210 210 310 310 410 410 510 565 665 43 83 83 122 122 161 161 201 222 262 450 500 110 220 220 330 330 440 440 550 625 735 43 87 87 130 130 173 173 217 246 289 500 560 120 240 240 360 360 480 480 600 690 810 47 2 94 5 94 5 141 7 141 7 189 0 189 0 236 2 271 7 318 9 560 630 140 260 260 380 380 500 500 620 780 900 55 1 102 4 102 4 149 6 149 6 196 9 196 9 244 1 307 1 354 3 630 710 145 285 285 425 425 565 565 705 865 1005 57 1 112 2 112 2 167 3 167 3 222 4 222 4 277 6 340 6 395 7 710 800 150 310 310 470 470 630 630 790 975 1135 59 1 122 0 122 0 185 0 185 0 248 0 248 0 311 0 383 9 446 9 800 900 180 350 350 520 520 690 690 860 1095 1265 70 9 137 8 137 8 204 7 204 7 271 7 271 7 338 6 431 1 498 0 900 1000 200 390 390 580 580 770 770 960 1215 1405 78 7 153 5 153 5 228 3 228 3 303 1 303 1 378 0 478 3 553 1 Cylindrical Roller Bearing Radial Internal Clearance limits These values indicate the expected range of mounted RIC following suggested push up values Timken suggests that customers consult with our engineers to evaluate unique applications or requirements for special operating conditions Cylindrical roller bearings Cylindrical roller bearings are available with Radial Internal Clearance designations per either of the following tables Timken R Clearance or ISO ABMA C Clearance Non standard values are also available by special request Standard radial internal clearance values are listed in the following tables based on bore size The clearance required for a given application depends on the desired operating precision rotational speed of the bearing and the fitting practice used Most applications use a normal or C0 clearance Typically larger clearance reduces the operating zone of the bearing increases the maximum roller load and reduces the bearing s expected life mounting designs continued A78 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A79 Engineering A A78 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A79 Radial Cylindrical Roller Bearings Min Max values for each RIC are shown in the two adjacent columns directly beneath the selected RIC Each single column represents a boundary between adjacent RICs For example the minimum values shown for R5 are also the maximum values for R4 minimum values for R4 are also the maximum values for R3 etc The desired RIC code R1 R2 etc must be added to the bearing number FOLLOWING ALL OTHER SUFFIXES Bore R2 R4 Bore R2 R4 nominal Min Max Min Max nominal Min Max Min Max R1 R3 R5 R1 R3 R5 Over Incl Min Max Min Max Min Max Over Incl Min Max Min Max Min Max mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in in in in in in in 80 100 0 013 0 041 0 081 0 130 0 196 0 272 3 00 350 0 081 0 127 0 198 0 279 0 376 0 483 3 1496 3 9370 0 0005 0 0016 0 0032 0 0051 0 0077 0 0107 11 8110 13 7795 0 0032 0 0050 0 0078 0 0110 0 0148 0 0190 100 120 0 013 0 046 0 091 0 152 0 226 0 310 35 0 400 0 107 0 165 0 236 0 318 0 414 0 521 3 9370 4 7244 0 0005 0 0018 0 0036 0 0060 0 0089 0 0122 13 7795 15 7480 0 0042 0 0065 0 0093 0 0125 0 0163 0 0205 120 140 0 023 0 056 0 104 0 170 0 256 0 353 4 00 450 0 14 0 203 0 279 0 361 0 457 0 564 4 7244 5 5118 0 0009 0 0022 0 0041 0 0067 0 0101 0 0139 15 7480 17 7165 0 0055 0 0080 0 0110 0 0142 0 0180 0 0222 140 160 0 025 0 066 0 124 0 196 0 284 0 384 45 0 500 0 152 0 216 0 292 0 381 0 508 0 645 5 5118 6 2992 0 0010 0 0026 0 0049 0 0077 0 0112 0 0151 17 7165 19 6850 0 0060 0 0085 0 0115 0 0150 0 0200 0 0254 160 180 0 028 0 069 0 132 0 208 0 300 0 401 5 00 560 0 165 0 229 0 305 0 406 0 533 0 671 6 2992 7 0866 0 0011 0 0027 0 0052 0 0082 0 0118 0 0158 19 6850 22 0472 0 0065 0 0090 0 0120 0 0160 0 0210 0 0264 180 200 0 036 0 081 0 152 0 234 0 330 0 437 56 0 630 0 178 0 254 0 356 0 483 0 610 0 747 7 0866 7 8740 0 0014 0 0032 0 0060 0 0092 0 0130 0 0172 22 0472 24 8031 0 0070 0 0100 0 0140 0 0190 0 0240 0 0294 200 220 0 041 0 086 0 157 0 239 0 335 0 4421 63 0 710 0 190 0 279 0 381 0 508 0 635 0 772 7 8740 8 6614 0 0016 0 0034 0 0062 0 0094 0 0132 0 0174 24 8031 27 9528 0 0075 0 0110 0 0150 0 0200 0 0250 0 0304 220 260 0 056 0 102 0 173 0 254 0 351 0 455 71 0 800 0 216 0 330 0 457 0 584 0 711 0 848 8 6614 10 2362 0 0022 0 0040 0 0068 0 0100 0 0138 0 0180 27 9528 31 4961 0 0085 0 0130 0 0180 0 2300 0 0280 0 0334 260 300 0 061 0 107 0 178 0 259 0 356 0 462 10 2362 11 8110 0 0024 0 0042 0 0070 0 0102 0 0140 0 0182 RADIAL INTERNAL CLEARANCE LIMITS All data on this chart are in millimeters inches mounting designs continued Engineering A A80 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A81 A80 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A81 needle roller BEARINGS Inspection of drawn cup needle roller bearings Although the bearing cup is accurately drawn from strip steel because of its fairly thin section it may go out of round during heat treatment When the bearing is pressed into a true round housing or ring gage of correct size and wall thickness it becomes round and is sized properly For this reason it is incorrect to inspect an unmounted drawn cup bearing by measuring the outside diameter The correct method for inspecting the bearing size is to 1 Press the bearing into a ring gage of proper size 2 Plug the bearing bore with the appropriate go and no go gages or measure it with a tapered arbor lathe mandrel Table 15 lists the go gage size for metric bearings which is the minimum needle roller complement bore diameter The no go gage size is larger than the maximum needle roller complement bore diameter by 0 002 mm Table 15 Dimensions mm Nominal bore Ring Needle roller complement diameter gage bore diameter Fws min mm Min Max 3 6 484 3 006 3 024 4 7 984 4 010 4 028 5 8 984 5 010 5 028 6 9 984 6 010 6 028 7 10 980 7 013 7 031 8 11 980 8 013 8 031 9 12 980 9 013 9 031 10 13 980 10 013 10 031 12 15 980 12 016 12 034 12 17 980 12 016 12 034 13 18 976 13 016 13 034 14 19 976 14 016 14 034 15 20 976 15 016 15 034 16 21 976 16 016 16 034 17 22 976 17 016 17 034 18 23 976 18 016 18 034 20 25 976 20 020 20 041 22 27 976 22 020 22 041 25 31 972 25 020 25 041 28 34 972 28 020 28 041 30 36 972 30 020 30 041 35 41 972 35 025 35 050 40 46 972 40 025 40 050 45 51 967 45 025 45 050 50 57 967 50 025 50 050 60 67 967 60 030 60 060 HK metric Series Bearings The ring gage sizes are in accordance with ISO N6 lower limit Inspection procedures Table 15 B provides the correct ring and plug gage diameters for inspecting inch drawn cup needle roller bearings When the letter H appears in the columns headed Bearing Bore Designation and Nominal Shaft Diameter the gage sizes listed are for the larger cross section bearings which include H in their bearing designation prefix Example Find the ring gage and plug gage dimensions for a BH 68 bearing The nominal bore diameter Fw for this bearing as shown in the table of dimensions is 3750 inch Since the letter H appears in the bearing designation the following information will be found opposite H6 3750 in Table 15 B ring gage 6255 diameter under needle rollers min 3765 diameter under needle rollers max 3774 The go plug gage is the same size as the minimum needle roller complement bore diameter and the no go plug gage size is 00001 inch larger than the maximum bore diameter Therefore the correct ring and plug gage dimensions are ring gage 6255 plug gage go 3765 plug gage no go 3775 These same gage dimensions also apply to JH 68 inch inch mounting designs continued A80 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A81 Engineering A A80 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A81 Table 15 B Bearing Nominal Nominal Dimensions inch bore shaft bore Ring Needle roller designation diameter diameter gage complement bore diameter inch Min Max 2 1 8 1250 2505 1258 1267 2 1 2 5 32 1562 2817 1571 1580 3 3 16 1875 3437 1883 1892 4 1 4 2500 4380 2515 2524 5 5 16 3125 5005 3140 3149 H 5 H 5 16 3125 5630 3140 3149 6 3 8 3750 5630 3765 3774 H 6 H 3 8 3750 6255 3765 3774 7 7 16 4375 6255 4390 4399 H 7 H 7 16 4375 6880 4390 4399 8 1 2 5000 6880 5015 5024 H8 H 1 2 5000 7505 5015 5024 9 9 16 5625 7505 5640 5649 H 9 H 9 16 5625 8130 5640 5649 10 5 8 6250 8130 6265 6274 H 10 H 5 8 6250 8755 6265 6274 11 11 16 6875 8755 6890 6899 H 11 H 11 16 6875 9380 6890 6899 12 3 4 7500 9995 7505 7514 H 12 H 3 4 7500 1 0620 7505 7514 13 13 16 8125 1 0620 8130 8139 H 13 H 13 16 8125 1 1245 8130 8139 14 7 8 8750 1 1245 8755 8764 H14 H 7 8 8750 1 1870 8755 8764 15 15 16 9375 1 1870 9380 9389 16 1 1 0000 1 2495 1 0005 1 0014 H 16 H1 1 0000 1 3120 1 0005 1 0014 17 1 1 16 1 0625 1 3120 1 0630 1 0639 18 1 1 8 1 1250 1 3745 1 1255 1 1264 H 18 H 1 1 8 1 1250 1 4995 1 1255 1 1264 19 1 3 16 1 1875 1 4995 1 1880 1 1889 20 1 1 4 1 2500 1 4995 1 2505 1 2514 H 20 H 1 1 4 1 2500 1 6245 1 2505 1 2514 21 1 5 16 1 3125 1 6245 1 3130 1 3140 22 1 3 8 1 3750 1 6245 1 3755 1 3765 H 22 H1 3 8 1 3750 1 7495 1 3755 1 3765 24 1 1 2 1 5000 1 8745 1 5005 1 5016 26 1 5 8 1 6250 1 9995 1 6255 1 6266 28 1 3 4 1 7500 2 1245 1 7505 1 7517 30 1 7 8 1 8750 2 2495 1 8755 1 8767 32 2 2 0000 2 3745 2 0006 2 0018 H 33 H 2 1 16 2 0625 2 5307 2 0635 2 0649 34 2 1 8 2 1250 2 4995 2 1256 2 1270 36 2 1 4 2 2500 2 6245 2 2506 2 2520 42 2 5 8 2 6250 2 9995 2 6260 2 6274 44 2 3 4 2 7500 3 1245 2 7510 2 7524 56 3 1 2 3 5000 3 9995 3 5010 3 5024 88 5 1 2 5 5000 5 9990 5 5010 5 5029 Inch Series extra precision Bearings Bearing bore should be checked with go and no go plug gages The go gage size is the minimum needle roller complement bore diameter The no go gage size is larger than the maximum needle roller complement bore diameter by 0 0001 inch Inspection dimensions for the extra precision bearings are given in the table below Note that these bearings must be inspected while mounted in the specified ring gage Bearing bores are checked with go and no go plug gages The go gage size is the minimum diameter inside the needle rollers The no go gage size is 0 0001 in larger than the maximum diameter inside the needle rollers Procedures for selecting ring and plug gage dimensions are the same as for those involving precision needle bearings except that the ring gage diameters and diameters inside the needle rollers must be drawn from the table on this page Nominal Diameter inside shaft Ring needle rollers diameter gage Fws min inch Min Max 1 8 0 2473 0 1256 0 1260 5 32 0 2785 0 1569 0 1573 3 16 0 3390 0 1881 0 1885 1 4 0 4328 0 2506 0 2510 5 16 0 4953 0 3131 0 3135 H 5 16 0 5578 0 3131 0 3135 3 8 0 5578 0 3756 0 3760 H 3 8 0 6203 0 3756 0 3760 7 16 0 6203 0 4381 0 4385 H 7 16 0 6828 0 4381 0 4385 1 2 0 6828 0 5006 0 5010 H 1 2 0 7453 0 5006 0 5010 9 16 0 7453 0 5631 0 5635 H 9 16 0 8078 0 5631 0 5635 5 8 0 8078 0 6256 0 6260 H 5 8 0 8703 0 6256 0 6260 11 16 0 8703 0 6881 0 6885 H 11 16 0 9328 0 6881 0 6885 3 4 0 9950 0 7503 0 7507 H 3 4 1 0575 0 7503 0 7507 13 16 1 0575 0 8128 0 8132 H 13 16 1 1200 0 8128 0 8132 7 8 1 1200 0 8753 0 8757 H 7 8 1 1825 0 8753 0 8757 15 16 1 1825 0 9378 0 9382 1 1 2450 1 0003 1 0007 H 1 1 3075 1 0003 1 0007 1 1 16 1 3075 1 0628 1 0632 1 1 8 1 3700 1 1253 1 1257 H 1 1 8 1 4950 1 1253 1 1257 1 3 16 1 4950 1 1878 1 1882 1 1 4 1 4950 1 2503 1 2507 H 1 1 4 1 6200 1 2503 1 2507 1 5 16 1 6200 1 3128 1 3132 1 3 8 1 6200 1 3753 1 3757 H 1 3 8 1 7450 1 3753 1 3757 1 1 2 1 8700 1 5003 1 5008 1 5 8 1 9950 1 6253 1 6258 1 3 4 2 1200 1 7503 1 7508 1 7 8 2 2450 1 8753 1 8758 2 2 3700 2 0003 2 0008 H 2 1 16 2 5262 2 0628 2 0633 2 1 8 2 4950 2 1253 2 1258 2 1 4 2 6200 2 2503 2 2508 2 5 8 2 9950 2 6254 2 6260 2 3 4 3 1200 2 7504 2 7510 3 1 2 3 9950 3 5004 3 5010 Gaging mounting designs continued Engineering A A82 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A83 A82 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A83 Needle roller cage assemblies Metric series needle roller and cage radial assemblies are supplied with needle roller complements subdivided into groups gages shown in Table 16 The groups are at Timken s option if nothing to the contrary is agreed upon at the time of ordering This is in accordance with Grade G2 specified in ISO 3096 standard The group limits of the needle rollers are indicated on the package Labels of identifying colors show the group limits of the needle rollers The needle roller and cage assemblies of one shipment usually contain needle rollers with group limits of between 0 to 2 and 5 to 7 m colors red blue and white Information on needle roller and cage assemblies with needle rollers of different group limits will be supplied on request Needle Roller Group Limits Grade G2 Group Marking Identifying color Tolerance of label or on m package 0 2 P0M2 1 3 M1M3 red 2 4 M2M4 3 5 M3M5 blue 4 6 M4M6 5 7 M5M7 white gray 6 8 M6M8 7 9 M7M9 green 8 10 M8M10 9 11 M9M11 yellow Table 16 In the marking of the gages P identifies zero 0 or plus M identifies minus The nominal inch assemblies WJ and WJC contain needle rollers manufactured to only one diameter grade Within any one assembly the needle rollers have a total diameter tolerance of 0001 inch The limit to precision of the radial clearance of mounted needle roller and cage assemblies is the capability of the user to hold close tolerances on the inner and outer raceways The tolerance of the overall width of these assemblies is given on the tabular pages of this section It may be impractical to finish the shaft to meet desired raceway design requirements In this case standard needle roller bearings with inner rings forming complete bearings will have to be used Such bearings meet the quality requirements in accordance with ISO standards For inner and outer ring tolerances the metric series bearings follow the normal tolerance class in ISO Standard 492 covering radial bearings Bearings to more precise tolerance classes P6 and P5 may be obtained upon request The metric series bearings may be obtained with radial internal clearance in accordance with ISO Standard 5753 also specified for cylindrical roller bearings Mostly they follow the normal C0 radial clearance group although bearings to clearance groups C2 C3 and C4 may be made available on request Inner ring and outer ring chamfer dimensions meet the requirements of ISO Standard 582 Whenever the shaft can be used as the inner raceway needle roller bearings without inner rings provide advantages of economy and close control of radial internal clearance in operation Tolerance class F6 is the normal specification for the metric series needle roller complement bore diameter of an unmounted bearing as shown in the following table In the case of needle roller bearings of series RNAO without flanges and without inner rings the outer rings and needle roller and cage assemblies are not interchangeable Metric series needle Roller Complement Bore Diameter For Bearings Without Inner Rings 3 6 10 18 6 10 13 22 10 18 16 27 18 30 20 33 30 50 25 41 50 80 30 49 80 120 36 58 120 180 43 68 180 250 50 79 250 315 56 88 315 400 62 98 Fw Fws min mm m low high mounting designs continued A82 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A83 Engineering A A82 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A83 Table 17 1 Single mean diameter is defined as the mean diameter in a single radial plane D Deviations from Nominal Nominal Outside Diameter of Single Mean Outside Diameter Dmp 1 of Width C inch inch inch inch high low high low 0 7500 2 0000 0 0 0005 0 0 005 2 0000 3 2500 0 0 0006 0 0 005 3 2500 4 7500 0 0 0008 0 0 005 4 7500 7 2500 0 0 001 0 0 005 7 2500 10 2500 0 0 0012 0 0 005 10 2500 12 5000 0 0 0014 0 0 005 Outside Diameter and Width Tolerances HJ Bearings Alternatively for inch designs the tolerances for the HJ bearings are given in Tables 17 and 18 and tolerances for the IR inner rings are given in Table 19 and 20 1 The smallest single diameter of the roller complement bore is defined as the diameter of the cylinder which when used as a bearing inner ring results in zero radial internal clearance in the bearing on at least one diameter Fw Deviations from Nominal of the Smallest Single Diameter 1 Nominal Roller Complement Bore Diameter of the Roller Complement Bore Fws min inch inch low high 0 5000 0 6250 0 0008 0 0017 0 6250 1 1250 0 0009 0 0018 1 1250 1 6250 0 0010 0 0019 1 6250 1 8750 0 0010 0 0020 1 8750 2 7500 0 0011 0 0021 2 7500 3 0000 0 0011 0 0023 3 0000 4 0000 0 0012 0 0024 4 0000 4 5000 0 0012 0 0026 4 5000 6 0000 0 0013 0 0027 6 0000 6 5000 0 0013 0 0029 6 5000 7 7500 0 0014 0 0030 7 7500 9 2500 0 0014 0 0032 Roller Complement Bore Tolerance HJ Bearings Table 18 mounting designs continued Engineering A A84 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A85 A84 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A85 1 Single mean diameter is defined as the mean diameter in a single radial plane d Deviations from Nominal Nominal Outside Diameter of Single Mean Outside Diameter dmp 1 of Width B inch inch inch inch high low high low 0 3125 0 7500 0 0 0004 0 010 0 005 0 7500 2 0000 0 0 0005 0 010 0 005 2 0000 3 2500 0 0 0006 0 010 0 005 3 2500 4 2500 0 0 0008 0 015 0 005 4 2500 4 7500 0 0 0008 0 015 0 010 4 7500 7 0000 0 0 001 0 015 0 010 7 0000 8 0000 0 0 0012 0 015 0 010 Bore and Width Tolerances IR Inner Rings Table 19 1 Single mean diameter is defined as the mean diameter in a single radial plane F Deviations from Nominal Nominal Outside Diameter of Single Mean Outside Diameter Fmp 1 inch inch high low 0 5000 0 6250 0 0005 0 0009 0 6250 1 0000 0 0007 0 0012 1 0000 1 1250 0 0009 0 0014 1 1250 1 3750 0 0009 0 0015 1 3750 1 8750 0 0010 0 0016 1 8750 3 0000 0 0011 0 0018 3 0000 3 7500 0 0013 0 0022 3 7500 4 5000 0 0015 0 0024 4 5000 5 5000 0 0015 0 0025 5 5000 6 5000 0 0017 0 0027 6 5000 8 2500 0 0019 0 0031 8 2500 9 2500 0 0020 0 0032 Outside Diameter Tolerance IR Inner Rings Table 20 mounting designs continued A84 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A85 Engineering A A84 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A85 needle roller bearings Bearings without inner rings When the shaft is used as the inner raceway for needle roller bearings it must have a hardness between 58 and 64 HRC and a wave free finish in order to realize the full load carrying capability of the bearing 1 Metallurgy either case hardening or through hardening grades of good bearing quality steel are satisfactory for raceways Steels which are modified for free machining such as those high in sulfur content and particularly those containing lead are seldom satisfactory for raceways To realize full bearing capacity the raceway area must be at least surface hard with a reasonable core strength It is preferred that the case depth be not less than 0 42 mm 0 015 inches The preferred surface hardness is equivalent to 58 HRC If the raceway is of lesser hardness see the modification factors shown on pages A39 and A34 The minimum effective case depth of hardened and ground raceways for use with all types of needle roller bearings depends on the applied load the diameter of the rolling elements and the core strength of the steel used To calculate the approximate case depth the following formula may be used Min case depth 0 07 to 0 12 Dw Dw is the diameter of the rolling element The high value should apply to a low core strength material and or heavy loads Note The effective case is defined as the distance from the surface after final grind to the 50 HRC hardness level 2 Strength the shaft must be of sufficient size to keep the operating deflections within the limits outlined 3 Tolerance the suggested shaft diameter tolerances for each type of needle roller bearing are indicated in the appropriate section of this catalog 4 Variation of mean shaft diameter within the length of the bearing raceway should not exceed 0 008 mm 0 0003 inches or one half the diameter tolerance whichever is smaller 5 Deviation from circular form the radial deviation from true circular form of the raceway should not exceed 0 0025 mm 0 0001 inches for diameters up to and including 25 mm 1 0 inches For raceways greater than 25 mm 1 0 inches the allowable radial deviation should not exceed 0 0025 mm 0 0001 inch multiplied by a factor of the raceway diameter divided by 25 for mm 1 0 for inches 6 High frequency lobing the lobing which occurs 10 or more times around the circumference of a shaft and exceeds 0 4 m 15 microinches peak to valley is defined as chatter Chatter usually causes undesirable noise and reduces fatigue life 7 Surface finish In addition to a wave free finish the raceway surface roughness of Ra 0 2 m 8 0 microinches must be maintained for the bearing to utilize its full load rating The raceway area must also be free of nicks burrs scratches and dents Oil holes are permissible in the raceway area but care must be taken to blend the edges gently into the raceway and if possible the hole should be located in the unloaded zone of the raceway Care must also be taken to prevent grind reliefs fillets etc from extending into the raceway area If the rollers overhang a grind relief or step on the shaft there will be high stress concentration with resultant early damage 8 End chamfer for the most effective assembly of the shaft into a bearing the end of the shaft should have a large chamfer or rounding This should help in preventing damage to the roller complement scratching of the raceway surface and nicking of the shaft end 9 Sealing surface in some instances bearings have integral or immediately adjacent seals that operate on the surface ground for the bearing raceway Here particular attention should be paid to the pattern of the shaft finish In no instance should there be a lead or spiral effect as often occurs with through feed centerless grinding Such a lead may pump lubricant past the seal 3 Variation of mean shaft raceway diameter and deviation from circular form of the raceway should not exceed one half the shaft diameter tolerance 4 Surface finish the surface finish should not exceed Ra 1 6 m 63 microinches 5 Locating shoulders or steps locating shoulders or steps in the shaft must be held to close concentricity with the bearing seat to prevent imbalance and resultant vibrations Bearings with inner rings When it is undesirable or impractical to prepare the shaft to be used as a raceway inner rings are available as listed in the tabular pages If the shaft is not used directly as a raceway the following design specifications must be met 1 Strength the shaft must be of sufficient size to keep the operating deflections within the limits outlined 2 Tolerance the suggested shaft diameter tolerances for each type of needle roller bearing are indicated in the appropriate section of the catalog mounting designs continued Engineering A A86 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A87 A86 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A87 needle roller bearings Bearings with outer rings For bearings with outer rings the function of the housing is to locate and support the outer ring The following specifications must be met 1 Strength housings should be designed so that the radial loads which will be placed on the bearings will cause a minimum of deflection or distortion of the housing 2 Variation of mean housing diameter within the length of the outer ring should not exceed 0 013 mm 0 0005 inches 3 Deviation from circular form the housing bore should be round within one half the housing bore tolerance 4 Parallelism when possible line bore housings which are common to one shaft to obtain parallelism of the housing bores and the shaft axis 5 Surface finish The surface finish should not exceed Ra 1 6 m 63 microinches 6 End chamfer to permit easy introduction of the bearing into the housing the end of the housing should have a generous chamfer Bearings without outer rings In many cases such as with gear bores it is desirable to have the housing bore serve as the outer raceway for radial needle roller and cage assemblies or loose needle roller complements In those instances as for shafts used as a raceway the housing bore must have a hardness between 58 and 64 HRC and a roughness Ra 0 2 m 8 0 microinches so that the full load carrying capacity of the bearing is realized 1 Strength the housing must be of sufficient cross section to maintain proper roundness and running clearance under maximum load 2 Metallurgical material selection hardness and case depth should be consistent with the requirements for inner raceways given in the shaft design Needle roller bearings can be installed into housings with a transition fit or a clearance fit The outer ring should be a transition fit in the housing when it rotates relative to the load The outer ring may be a clearance fit in the housing when it is stationary relative to the load in either case locate the bearings by shoulders or other locating devices to prevent axial movement Since the needle roller bearing does not require an interference fit in the housing to round and size it properly a split housing may be used if desired Dowels should be used to maintain proper register of the housing sections Drawn cup bearings have a thin case hardened outer ring which is out of round from the hardening operation For proper mounting it must always be pressed into the housing Split housings will not round and size a drawn cup bearing When split housings must be used the bearing should first be mounted in a cylindrical sleeve The housing should be of sufficient tensile strength and section to round and size the bearing It must be designed for minimum distortion under load Steel or cast iron housings are preferred Housing bores in low tensile strength materials such as aluminum magnesium phenolics etc should be reduced to provide more interference fit Thin section cast iron and steel housings may also require reduced bores Consult your Timken representative for suggestions when working with these lower strength housings The housing should be through bored if possible When shouldered housing bores are unavoidable the bearing should be located far enough from the shoulder to avoid the danger of crushing the end of the drawn cup during installation When the drawn cup bearing is mounted close to the housing face care should be taken to mount the bearing at least 0 25 mm 0 010 inches within the housing face to protect the bearing lip 3 Variation of mean housing raceway diameter and deviation from circular form of the raceway the raceway out of roundness and taper should not exceed 0 008 mm 0 0003 inches or one half the bore tolerance whichever is smaller In addition the bore diameter must never be smaller at both ends than in the center sway back 4 Surface finish In addition to a wave free finish the raceway surface roughness of Ra 0 2 m 8 0 microinches must be maintained for the bearing to utilize its full load rating The raceway area must also be free of nicks burrs scratches and dents 5 Grind reliefs care must be exercised to ensure that grind reliefs fillets etc do not extend to the raceway Oil holes in the raceway area are permissible but the edges must be blended smoothly with the raceway and if possible the hole should be located in the unloaded zone of the raceway mounting designs continued A86 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A87 Engineering A A86 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A87 Additional Details about Drawn cup needle bearings Drawn cup bearings are manufactured to a degree of precision that will satisfy the radial clearance requirements of most applications The total radial clearance for an installed drawn cup bearing results from the build up of manufacturing tolerances of the housing bore the inner raceway diameter and the bearing as well as the minimum radial clearance required for the application For metric series drawn cup bearings requiring close control of radial internal clearance the suggested housing bore tolerance is N6 and h5 tolerance for the inner raceway diameter When such exacting close control of radial internal clearance is not required the user may select N7 housing bore and h6 inner raceway diameter tolerances For metric series drawn cup bearings used in housings made from materials of low rigidity or steel housings of small section the suggested housing bore tolerance is R6 R7 To maintain normal radial internal clearance the inner raceway diameter tolerance should be h5 h6 For metric series drawn cup bearing applications where the outer ring rotates with respect to the load it is suggested that both the housing bore and the inner raceway diameter be reduced using R6 R7 and f5 f6 tolerance practice respectively Metric series drawn cup bearing applications involving oscillating motion may require reduced radial internal clearances This reduction may be accomplished by increasing the inner raceway diameter using j6 tolerance When it becomes impractical to meet the shaft raceway design requirements hardness case depth surface finish etc outlined in this section standard inner rings may be used with metric series drawn cup bearings It is suggested that when metric series inner rings are used with metric series drawn cup bearings they should be mounted with a loose transition fit on the shaft using g6 g5 shaft diameter tolerance The inner ring should be endclamped against a shoulder If a tight transition fit must be used shaft diameter tolerance h6 h5 to keep the inner ring from rotating relative to the shaft the inner ring outside diameter as mounted must not exceed the raceway diameter required by the drawn cup bearing for the particular application In case the outside diameter of the inner ring when mounted on the shaft exceeds the required raceway diameter for the matching drawn cup bearing it should be ground to proper diameter while mounted on the shaft Inch drawn cup needle roller bearings utilize the standard tolerance scheme outlined in the following figure mounting designs continued Fig A 14 Engineering A A88 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A89 A88 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A89 For housing materials of low rigidity or steel housings of small section it is suggested that for initial trial the housing bore diameters given in the tabular pages be reduced by the amounts shown in Table 21 To maintain normal radial internal clearance the inner raceway diameter tolerance given in the tabular pages should be used Low Rigidity Housing Bore Nom Housing Bore Subtract Inch Inch over incl 0 38 0004 38 1 00 0006 1 00 2 00 0010 2 00 3 00 0012 3 00 6 00 0014 Table 21 For applications where the outer ring rotates with respect to the load it is suggested that both the housing bore and inner raceway diameter be reduced Bearings of nominal inch dimensions should have the housing bore and inner raceway diameters reduced by 0005 Applications involving oscillating motion often require reduced radial clearances This reduction is accomplished by increasing the shaft raceway diameters as shown in Table 22 Nominal inch bearing oscillating shaft size Shaft Size Add inch inch 094 to 188 0003 25 to 1 875 0005 2 to 5 5 0006 Table 22 Where it becomes impractical to meet the shaft raceway design requirements hardness case depth surface finish etc standard inner rings for inch drawn cup bearings are available Inner rings for inch drawn cup bearings are designed to be a loose transition fit on the shaft and should be clamped against a shoulder If a tight transition fit must be used to keep the inner ring from rotating relative to the shaft the inner ring O D as mounted must not exceed the raceway diameters required by the drawn cup bearing for the particular application See the previous discussion on internal clearances and fits for further details on inner raceway diameter choice Mounting Basic Shaft Raceway Housing Bore Bore Nominal Nominal Diameter Designation Bore O D Inch Max Min Min Max GB 2 1250 2500 0 1251 0 1248 0 2470 0 2473 GB 2 1 2 1562 2812 0 1564 0 1561 0 2782 0 2785 GB 3 1875 3438 0 1876 0 1873 0 3387 0 3390 GB 4 2500 4375 0 2501 0 2498 0 4325 0 4328 GB 5 3125 5000 0 3126 0 3123 0 4950 0 4953 GBH 5 3125 5625 0 3126 0 3123 0 5575 0 5578 GB 6 3750 5625 0 3751 0 3748 0 5575 0 5578 GBH 6 3750 6250 0 3751 0 3748 0 6200 0 6203 GB 7 4375 6250 0 4376 0 4373 0 6200 0 6203 GBH 7 4375 6875 0 4376 0 4373 0 6825 0 6828 GB 8 5000 6875 0 5001 0 4998 0 6825 0 6828 GBH 8 5000 7500 0 5001 0 4998 0 7450 0 7453 GB 9 5625 7500 0 5626 0 5623 0 7450 0 7453 GBH 9 5625 8125 0 5626 0 5623 0 8075 0 8078 GB 10 6250 8125 0 6251 0 6248 0 8075 0 8078 GBH 10 6250 8750 0 6251 0 6248 0 8700 0 8703 GB 11 6875 8750 0 6876 0 6873 0 8700 0 8703 GBH 11 6875 9375 0 6876 0 6873 0 9325 0 9328 GB 12 7500 1 0000 0 7501 0 7498 0 9950 0 9953 GBH 12 7500 1 0625 0 7501 0 7498 1 0575 1 0578 GB 13 8125 1 0625 0 8126 0 8123 1 0575 1 0578 GBH 13 8125 1 1250 0 8126 0 8123 1 1200 1 1203 GB 14 8750 1 1250 0 8751 0 8748 1 1200 1 1203 GBH 14 8750 1 1875 0 8751 0 8748 1 1825 1 1829 GB 15 9375 1 1875 0 9376 0 9373 1 1825 1 1829 GB 16 1 0000 1 2500 1 0001 0 9998 1 2450 1 2454 GBH 16 1 0000 1 3125 1 0001 0 9998 1 3075 1 3079 GB 17 1 0625 1 3125 1 0626 1 0623 1 3075 1 3079 GB 18 1 1250 1 3750 1 1251 1 1248 1 3700 1 3704 GBH 18 1 1250 1 5000 1 1251 1 1248 1 4950 1 4955 GB 19 1 1875 1 5000 1 1876 1 1873 1 4950 1 4955 GB 20 1 2500 1 5000 1 2501 1 2498 1 4950 1 4955 GBH 20 1 2500 1 6250 1 2501 1 2498 1 6200 1 6205 GB 21 1 3125 1 6250 1 3126 1 3123 1 6200 1 6205 GB 22 1 3750 1 6250 1 3750 1 3747 1 6200 1 6205 GBH 22 1 3750 1 7500 1 3750 1 3747 1 7450 1 7455 GB 24 1 5000 1 8750 1 5000 1 4997 1 8700 1 8705 GB 26 1 6250 2 0000 1 6250 1 6247 1 9950 1 9955 GB 28 1 7500 2 1250 1 7500 1 7497 2 1200 2 1205 GB 30 1 8750 2 2500 1 8750 1 8747 2 2450 2 2455 GB 32 2 0000 2 3750 2 0000 1 9997 2 3700 2 3705 GBH 33 2 0625 2 5312 2 0624 2 0621 2 5262 2 5267 GB 34 2 1250 2 5000 2 1249 2 1246 2 4950 2 4955 GB 36 2 2500 2 6250 2 2499 2 2496 2 6200 2 6205 GB 42 2 6250 3 0000 2 6248 2 6245 2 9950 2 9956 GB 44 2 7500 3 1250 2 7498 2 7495 3 1200 3 1206 GB 56 3 5000 4 0000 3 4998 3 4995 3 9950 3 9956 Check for availability not every size may be in production EXTRA PRECISION INCH DRAWN CUP NEEDLE ROLLER BEARINGS mounting designs continued A88 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A89 Engineering A A88 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A89 INSTALLATION OF DRAWN CUP BEARINGS General installation requirements A drawn cup bearing must be pressed into its housing An installation tool similar to the ones shown must be used in conjunction with a standard press The bearing must not be hammered into its housing even in conjunction with the proper assembly mandrel The bearing must not be pressed tightly against a shoulder in the housing If it is necessary to use a shouldered housing the depth of the housing bore must be sufficient to ensure the housing shoulder fillet as well as the shoulder face clears the bearing The installation tool must be co axial with the housing bore Installation of Open End Bearings It is advisable to utilize a positive stop on the press tool to locate the bearing properly in the housing The assembly tool should have a leader or a pilot as shown to aid in starting the bearing true in the housing The ball detent shown on the drawing is used to assist in aligning the rollers of a full complement bearing during installation and to hold the bearing on the installation tool A caged type drawn cup bearing does not require a ball detent to align its rollers The ball detent may still be used to hold the bearing on the installation tool or an O ring may be used The bearing should be installed with the stamped end the end with identification markings against the angled shoulder of the pressing tool INCH BEARINGS A 1 64 in less than housing bore B 003 in less than shaft diameter C distance bearing will be inset into housing minimum of 008 in D pilot length should be length of bearing less 1 32 in E approximately 1 2 D METRIC BEARINGS A 0 4 mm less than housing bore B 0 08 mm less than shaft diameter C distance bearing will be inset into housing minimum of 0 2 mm D pilot length should be length of bearing less 0 8 mm E approximately 1 2 D C 15 A D E B Stamped end of bearing Generous chamfer or rounding for easy bearing installation o mounting designs continued Engineering A A90 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A91 A90 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A91 DRAWN CUP needle roller BEARINGS inch Installation of closed end bearings The installation tool combines all the features of the tool used to install open end bearings but the pilot is spring loaded and is part of the press bed The angled shoulder of the pressing tool should bear against the closed end with the bearing held on the pilot to aid in starting the bearing true in the housing A 1 64 in less than housing bore B 003 in less than shaft diameter C distance bearing will be inset into housing minimum of 008 in Extraction of drawn cup bearings The need to extract a drawn cup bearing does not arise often Standard extractor tools may be purchased from a reputable manufacturer Customers may produce the special extraction tools at their own facilities After extraction the drawn cup bearing should not be reused Extraction from a straight housing When it is necessary to extract a drawn cup bearing from a straight housing a similar tool to the installation tool but without the stop may be used To avoid damage to the bearing pressure should be applied against the stamped end of the bearing just as it is done at installation C B A mounting designs continued A90 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A91 Engineering A A90 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A91 DRAWN CUP needle roller BEARINGS Extraction from a shouldered or dead end housing with space between the bearing and the housing shoulder Bearings may be extracted from shouldered or dead end housings with a common bearing puller tool as shown This type of tool is slotted in two places at right angles to form four prongs The four puller prongs are pressed together and inserted into the space between the end of the bearing and the shoulder The prongs are forced outward by inserting the expansion rod and then the bearing is extracted Do not reuse the bearing after extraction Extraction from a shouldered housing with bearing pressed up close to the shoulder The tool to be used as shown is of a similar type described for a shouldered or dead end housing but the rollers must first be removed from the bearing The four segment puller jaws are collapsed and slipped into the empty cup The jaws are then forced outward into the cup bore by means of the tapered expansion rod The jaws should bear on the lip as near as possible to the cup bore The cup is then pressed out from the top mounting designs continued Engineering A A92 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A93 A92 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A93 drawn cup roller clutches Housing design Drawn cup clutches and clutch and bearing assemblies are mounted with a simple press fit in their housings Through bored and chamfered housings are preferred Provisions for axial location such as shoulders or snap rings are not required The case hardened cups must be properly supported Steel housings are preferred and must be used for applications involving high torque loads to prevent radial expansion of the clutch cups The suggested minimum housing outside diameters in the tables of dimensions are for steel The housing bore should be round within one half of the diameter tolerance The taper within the length of the outer ring should not exceed 0 013 mm or 0 0005 inch The surface finish of the housing bore should not exceed 63 microinches a a arithmetic average or 1 6 m on the Ra scale Low strength housings non steel sintered metals and some plastics may be entirely satisfactory in lightly loaded applications When using non steel housings thoroughly test designs Adhesive compounds can be used to prevent creeping rotation of the clutch in plastic housings with low friction properties Adhesives will not provide proper support in oversized metallic housings When using adhesives care must be taken to keep the adhesive out of the clutches and bearings Shaft design The clutch or bearing assembly operates directly on the shaft whose specifications of dimensions hardness and surface finish are well within standard manufacturing limits Either case hardening or through hardening grades of good bearing quality steel are satisfactory for raceways Steels which are modified for free machining such as those high in sulfur content and particularly those containing lead are seldom satisfactory for raceways For long fatigue life the shaft raceway must have a hardness equivalent to 58 HRC ref ASTM E 18 and ground to the suggested diameter shown in the tables of dimensions It may be through hardened or it may be case hardened with an effective case depth of 0 mm 0 015 inch Effective case depth is defined as the distance from the surface inward to the equivalent of 50 HRC hardness level after grinding Taper within the length of the raceway should not exceed 0 008 mm 0 0003 inch or one half the diameter tolerance whichever is smaller The radial deviation from true circular form of the raceway should not exceed 0 0025 mm 0001 inch for diameters up to and including 25 4 mm 1 inch For raceways greater than 25 mm or 1 0 inch the allowable radial deviation may be greater than 0 0025 mm 0001 inch by a factor of raceway diameter in inches divided by 1 0 or a factor of raceway diameter in mm divided by 25 4 Surface finish on the raceway should not exceed 16 microinches a a arithmetic average or 0 4 m on the Ra scale Deviations will reduce the load capacity and fatigue life of the shaft Rack Indexing Drive Motor Backstops 2 Speed Gearbox with Reversing Input Timing Motor Freewheels Washing Machine Transmission mounting designs continued A92 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A93 Engineering A A92 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A93 Installation Simplicity of installation promotes additional cost savings The drawn cup roller clutch or the clutch and bearing assembly must be pressed into its housing The unit is pressed into the bore of a gear hub or pulley hub or housing of the proper size and no shoulders splines keys screws or snap rings are required Installation procedures are summarized in the following sketches Use an arbor press or hydraulic ram press which will exert steady pressure Never use a hammer or other tool requiring pounding to drive the clutch into its housing Make sure that the housing bore is chamfered to permit easy introduction of the clutch and bearing or the clutch unit Press unit slightly beyond the chamfer in the housing bore to assure full seating Through bored housings are always preferred If the housing has a shoulder never seat the clutch against the shoulder IMPORTANT The mounted clutch or clutch and bearing assembly engages when the housing is rotated relative to the shaft in the direction of the arrow and LOCK marking LOCK stamped on the cup Make sure that the unit is oriented properly before pressing it into its housing 15 Use an installation tool as shown in the diagram above If clutch is straddled by needle roller bearings press units into position in proper sequence and preferably leave a small clearance between units When assembling the shaft it should be rotated during insertion The end of the shaft should have a large chamfer or rounding o Amount of Recess Chamfer Amount of Recess Use O Ring on Pilot Long Lead on Pilot O Ring holds unit on Pilot during installation Pilot Dia is 0 02 in 0 5mm less than nom Shaft Dia mounting designs continued Engineering A A94 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A95 A94 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A95 RADIAL NEEDLE ROLLER AND CAGE ASSEMBLIES METRIC Radial needle roller and cage radial assemblies use the housing bore as the outer raceway and the shaft as the inner raceway In order to realize full bearing load rating the housing bore and the shaft raceways must have the correct geometric and metallurgical characteristics The housing should be of sufficient cross section to maintain adequate roundness and running clearance under load The only limit to precision of the radial clearance of a mounted assembly is the capability of the user to hold close tolerances on the inner and outer raceways The suggested shaft tolerances listed in Table 23 are based on housing bore tolerance G6 and apply to metric series needle roller and cage radial assemblies with needle rollers of group limits between P0M2 and M5M7 Inch cage and roller assemblies list shaft tolerances in the bearing data tables based on h5 tolerances and housings to G6 tolerances Table 23 Suggested Shaft Tolerances for metric bearings using housing bores machined to g6 as outer racewa ys Nominal shaft diameter in mm 80 80 Radial clearance Shaft tolerance Smaller than normal j5 h5 Normal h5 g5 Larger than normal g6 f6 Needle roller and cage radial assembly must be axially guided by shoulders or other suitable means The end guiding surfaces should be hardened to minimize wear and must provide sufficient axial clearance to prevent end locking of the assembly Metric length tolerance H11 is suggested Inch bearings are designed for minimum 0 008 inch axial clearance If end guidance is provided by a housing shoulder at one end and by a shaft shoulder at the other end the shaft must be axially positioned to prevent end locking of needle roller and cage assembly The housing and shaft shoulder heights should be 70 to 90 percent of the needle roller diameter to provide proper axial guidance Needle roller and cage radial assemblies which are mounted side by side must have needle rollers of the same group limits to ensure uniform load distribution Connecting rod guidance arrangements End guidance of a connecting rod can be provided either at the crank pin or at the wrist pin end Connecting rod guidance is achieved at the crank pin end using a small clearance between the crank webs Guidance at the wrist pin end is controlled by a small clearance between the piston bosses H11 B c H11 B c Guidance in the housing Guidance on the shaft Crank pin end guidance With crank pin end guidance care must be taken to ensure that an adequate amount of lubricant is supplied to the crank pin bearing and the surfaces which guide the connecting rod For this purpose grooves in the connecting rod end faces or slots in the connecting rod bore aligned with the incoming lubrication path should be provided Occasionally brass or hardened steel washers may be used for end guidance of the connecting rod At the wrist pin end the needle roller and cage radial assembly is located axially between the piston bosses It may be both economical and effective to machine the connecting rod at the wrist pin end and at the crank pin end to the same width It is suggested that at the wrist pin end the needle roller length does not overhang the connecting rod width Otherwise the load rating of the needle roller and cage assembly will be reduced Wrist pin end guidance Wrist pin end will get the most effective axial guidance between the piston bosses Grooves in the bottom of the piston bosses and a chamfer of small angle on each side of the upper portion of the connecting rod small end can improve the oil flow to the needle roller and cage radial assembly and its guiding surfaces The length of the needle roller and cage radial assembly and the connecting rod width at the crank pin end should be identical to ensure best possible radial piloting of cage in the bore of the connecting rod The crank webs are recessed to allow proper axial alignment of the connecting rod As a rule it is not necessary to have additional supply of lubricant Only in engines with sparse lubrication should consideration be given to provide lubricating slots in the connecting rod bores as with crank pin end guidance 1 7 2 B c C10 0 03 100 B c B c B c h8 2 B c h8 b 1 B c B11 B c 0 03 100 B c B c B c h8 B11 5 10 0 5 1 6 10 B c Crank Pin End Guidance Wrist Pin End Guidance mounting designs continued A94 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A95 Engineering A A94 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A95 Table 24 NEEDLE ROLLER bearings Heavy duty needle roller bearings It is suggested that needle roller bearings are mounted in their housings with a clearance fit if the load is stationary relative to the housing or with a tight transition fit if the load rotates relative to the housing Table 24 lists the suggested tolerances for the housing bore and the shaft raceway for metric series bearings without inner rings Table 25 lists the suggested shaft tolerances for the above two mounting conditions when the metric series bearings are used with inner rings The suggested housing bore tolerances for metric series bearings with inner rings are the same as the housing bore tolerance listed in Table 24 for metric series bearings without inner rings The tables of dimensions for inch bearings list the suggested ISO H7 tolerances for the housing bore and the suggested ISO h6 tolerances for the shaft raceway when the outer ring is to be mounted with a clearance fit They also list the suggested ISO N7 tolerances for the housing bore and the suggested ISO f6 tolerances for the shaft raceway when the outer ring is to be mounted with a tight transition fit Other mounting dimensions may be required for special operating conditions such as 1 Extremely heavy radial loads 2 Shock loads 3 Temperature gradient across bearing 4 Housing material with heat expansion coefficient different than that of the bearing If these conditions are expected please consult your Timken representative Shaft Tolerances For Metric Series Bearings With Inner Rings Use housing tolerance shown in Table 24 Rotation Nominal ISO Tolerance Conditions Shaft Zone for Diameter d Shaft mm load rotates all diameters g6 relative to housing load stationary relative to housing 40 k6 40 100 m6 100 140 m6 140 n6 Table 25 NOTE Care should be taken that the selected bearing internal clearance is appropriate for the operating conditions Fillets undercuts and shoulder heights For Metric Series Bearings r s ras t r a2s b h Min Max Min Min mm 0 15 0 15 0 6 0 3 0 3 1 0 6 0 6 2 1 1 0 2 1 3 2 2 5 1 1 1 0 3 2 3 3 25 1 5 1 5 0 4 2 3 2 4 2 2 0 5 2 5 4 5 2 1 2 1 0 5 3 4 7 5 5 3 2 5 0 5 3 5 5 3 6 Table 26 r r a r h r h r D 1F r a r r a2 r h r h r D 1F t t b r a2 Regardless of the fit of the bearing outer ring in the housing the outer ring should be axially located by housing shoulders or other positive means The bearing rings should closely fit against the shaft and housing shoulders and must not contact the fillet radius In fact the maximum shaft or housing fillet ras max should be no greater than the minimum bearing chamfer rs min as shown in Table 26 In order to permit mounting and dismounting of the shaft the maximum diameter D1 in Table 27 must not be exceeded Fw is shown in the bearing tables For inch bearings the unmarked end of the outer ring should be assembled against the housing shoulder to assure clearing the maximum housing fillet Similarly the unmarked end of the inner ring should be assembled against the shaft shoulder to assure clearing the maximum shaft fillet mounting designs continued Rotation Nominal ISO tolerance Nominal shaft ISO tolerance conditions housing bore zone for diameter F zone for diameter D housing shaft mm caged full mm caged full Load all diameters H7 J6 all diameters h6 h5 stationary relative to housing General all diameters K7 all diameters g6 work with larger clearance Load all diameters N7 M6 all diameters f6 g5 rotates relative to housing Mounting Tolerances For Metric Series Bearings Without Inner Ring NOTE Care should be taken that the selected bearing internal clearance is appropriate for the operating conditions Engineering A A96 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A97 A96 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A97 Shoulder diameter D1 max for Metric Series Bearings Dimensions in mm Needle roller complement 20 55 100 250 bore diameter 20 55 100 250 Fw Diameter D1max Fw 0 3 Fw 0 5 Fw 0 7 Fw 1 Fw 1 5 Table 27 Needle roller bearings without flanges of series RNAO and NAO must have the needle roller and cage radial assembly properly end guided by shoulders or other suitable means such as the spring steel washers SNSH These end guiding surfaces should be hardened and precision turned or ground to minimize wear and should properly fit against the outer rings and the inner rings to provide the desired end clearance for the needle roller and cage radial assembly Needle roller and cage thrust assemblies On NTA inch type needle roller and cage thrust assemblies the cage bore has a larger contact area and a closer tolerance than the outside diameter Therefore bore piloting is preferred for these assemblies To reduce wear it is suggested that the piloting surface for the cage be hardened to an equivalent of at least 55 HRC Where design requirements prevent bore piloting the NTA needle roller and cage thrust assemblies may be piloted on the outside diameters It should be noted that the diameter to clear washer O D given in the tabular data is not suitable for outside diameter piloting For such cases suitable O D piloting dimensions should be determined in consultation with your Timken representative On FNT and AXK Series needle roller and cage thrust assemblies the cage bore has a closer tolerance than the outside diameter therefore bore piloting is preferred for these assemblies To reduce wear it is suggested that the piloting surface for the cage be hardened to an equivalent of at least 55 HRC Where design requirements prevent bore piloting the FNT or AXK Series needle roller and cage thrust assemblies may be piloted on the outside diameters For such cases suitable O D piloting dimensions should be determined Mounting tolerances are given in the table to the right Ideally a thrust washer should be stationary with respect to and piloted by its supporting or backing member whether or not this is an integral part of the shaft or housing There should be no rubbing action between the thrust washer and any other machine member The economics of design however often preclude these ideal conditions and thrust washers must be employed in another manner In such cases design details should be determined in consultation with your Timken representative The mounting tolerances for series AS LS WS and GS thrust washers for use with needle roller and cage thrust assemblies are given in the table to the right As for the FNT and AXK Series thrust assemblies to reduce wear the piloting surface for the thrust washers should also be hardened to an equivalent of at least 55 HRC MAXIMUM ANGLE ARCTAN 0 0005 MAXIMUM ANGLE ARCTAN 0 001 Out of Square Surface Dished or Coned Surface Fig A 15 Fig A 16 In some applications it is desirable to use the backup surfaces as raceways for the needle rollers of the needle roller and cage thrust assemblies In such designs these surfaces must be hardened to at least 58 HRC If this hardness cannot be achieved and thrust washers cannot be used the load ratings must be reduced as explained in the Fatigue Life section Thrust raceway surfaces must be ground to a surface finish of 0 2 m 0 8 m Ra When this requirement cannot be met thrust washers must be used The raceways against which the needle rollers operate or the surface against which the thrust washers bear must be square with the axis of the shaft Equally important the raceway or surface backing the thrust washer must not be dished or coned The permissible limits of out of squareness and dishing or coning are shown in Figures A 15 and A 16 Metric raceway contact dimensions Ea and Eb are given in the tabular pages For the thin series AS thrust washers full backup between the dimensions Ea and Eb should be provided Mounting Tolerances for Shafts and Housings for Metric Series Components Bearing shaft housing piloting components tolerance tolerance member shaft piloting housing piloting Cylindrical roller h8 H10 shaft needle roller cage thrust assembly Thin thrust h10 H11 shaft washer AS Heavy thrust h10 H11 shaft washer LS Shaft piloted h6 j6 clearance shaft thrust washer WS 811 Housing piloted Clearance H7 K7 housing thrust washer GS 811 mounting designs continued A96 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A97 Engineering A A96 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A97 CONSTRUCTION Basic designs Cylindrical roller thrust bearings dimension series 811 and 812 comprise a cylindrical roller and cage thrust assembly K a shaft washer WS and a housing washer GS Providing the backup surfaces can be hardened and ground they can be used as raceways for the cylindrical rollers of the cylindrical roller and cage thrust assembly resulting in a compact bearing arrangement Cage designs Metric series cylindrical roller thrust bearings use molded cages of glass fiber reinforced nylon 6 6 suffix TVP or machined cages of light metal suffix LPB The cages are designed to be piloted on the shaft The reinforced nylon cages can be used at temperatures up to 120 C continuously for extended periods When lubricating these bearings with oil it should be ensured that the oil does not contain additives detrimental to the cage over extended life at operating temperatures higher than 100 C Also care should be exercised that oil change intervals are observed as old oil may reduce cage life at such temperatures Bearing thrust washers Shaft washers and housing washers Shaft washers of types WS 811 and WS 812 as well as housing washers of types GS 811 and GS 812 are components of the metric series cylindrical roller thrust bearings of series 811 and 812 They are made of bearing quality steel with hardened and precision ground and lapped flat raceway surfaces The tolerances of the thrust bearing bore and outside diameter shown in Table 7 and Table 8 on page A47 apply to shaft and housing piloted metric series washers Heavy thrust washers LS thin thrust washers AS These thrust washers more frequently used with needle roller and cage thrust assemblies of metric series FNT or AXK are also suitable for use with the cylindrical roller and cage thrust assemblies K 811 The heavy thrust washer of series LS are made of bearing quality steel hardened and precision ground on the flat raceway surfaces The bore and outside diameters of the heavy thrust washers are not ground Therefore when used with K 811 type assemblies they are only suggested where accurate centering is not required The thin thrust washers of series AS may be used in applications where the loads are light Both types of these washers are listed in the tabular part of the metric series needle roller and cage thrust assemblies section mounting designs continued Engineering A A98 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A99 A98 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A99 DIMENSIONAL ACCURACY The tolerances for the metric series cylindrical roller thrust bearing bore and outside diameter shown in Tables 7 and 8 on page A47 apply to shaft piloted washers of series WS 811 and WS 812 as well as housing piloted washers of series GS 811 and GS 812 The tolerances for the bore and outside diameter of series AS thrust washers are shown in Table 13 The tolerances for the bore and outside diameter of series LS thrust washers are given in Table 14 Bore inspection procedures for thin thrust washers AS and heavy thrust washers LS are given on page A50 MOUNTING TOLERANCES Shaft and housing tolerances for mounting metric series cylindrical roller and cage thrust assemblies are given on page A96 If the cylindrical rollers of the cylindrical roller and cage thrust assemblies are to run directly on the adjacent support surfaces these must be hardened to at least 58 HRC Raceway contact dimensions Ea and Eb must be observed The backup surfaces for the shaft washers WS 811 and WS 812 as well as the housing washers GS 811 and GS 812 of cylindrical roller thrust bearings must be square with the axis of the shaft Equally important the raceway or the surface backing the thrust washer must not be dished or coned The permissible limits of the squareness and dishing or coning are shown in Figures A 15 and A 16 When using the thin AS thrust washers the cylindrical rollers of the thrust cage assembly must be supported over their entire length Bearing thrust washers should make close contact with the shaft or housing shoulder and must not touch the fillet radius Therefore the maximum fillet radius ras max must be no greater than the minimum chamfer rs min of the shaft washer WS and the housing washer GS thrust bearings Tapered Roller thrust bearings are generally mounted with a fit range on the inside diameter of 127 m 0 0050 in loose to 400 m 0 0150 in loose Sufficient clearance should be provided on the outside diameter to permit free centering of the bearing without interference When Type TTHD or TTHDFL thrust bearings are subjected to continuous rotation the rotating race should be applied with a minimum interference fit of 25 m 0 0010 in Sufficient clearance should be provided on the outside diameter of the stationary race to permit free centering of the bearing without interference mounting designs continued A98 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A99 Engineering A A98 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A99 TAPERED ROLLER BEARING Mounting procedure Bearing performances can be adversely affected by improper mounting procedure or lack of care during the assembly phase Environment Cleanliness during the bearing mounting operation is essential for a rolling bearing to operate for maximum service life Bearings in their shipping containers or wrapping have been coated for rust protection While this coating is not sufficient to properly lubricate the bearing it is compatible with most lubricants and therefore does not have to be removed when mounting the bearing in the majority of applications Burrs foreign matter and damaged bearing seats cause misalignment Care should be taken to avoid shearing or damaging bearing seats during assembly which may introduce misalignment or result in a change of bearing setting during operation Fitting Adequate tools must be provided to properly fit the inner and outer races on shafts or in housings to avoid damage Direct shock on the races must be avoided Often bearing races have to be heated or cooled to ease assembly Do not heat standard bearings above 150 C 300 F or freeze outer races below 55 C 65 F For precision bearings do not heat above 65 C 150 F or freeze below 30 C 20 F Note For more information on this subject please contact your Timken representative mounting designs The primary function of either the cone or cup backing shoulders is to positively establish the axial location and alignment of the bearing and its adjacent parts under all loading and operating conditions For a tapered roller bearing to operate for maximum service life it is essential that a shoulder square with the bearing axis and of sufficient diameter is provided for each race It must be of sufficient section and design to resist axial movement due to loading or distortion and must be wear resistant at the interface with the bearing The conventional and most widely accepted method used to provide bearing backing is to machine a shoulder on a shaft or in the housing Fig A 17 In some applications a spacer is used between a cone and shaft shoulder or a snap ring As a further alternative a split spacer can be used Fig A 18 A spacer or snap ring can also be used for cup backing Fig A 19 If a snap ring is used for bearing backing it is suggested that an interference cup fit be used The cup used for bearing setting in a direct mounting roller small ends pointing outwards is usually set in position by a cup follower or by mounting in a carrier Fig A 20 Carrier Cup carrier Fig A 17 Shaft and housing shoulders Snap ringSpacer Split spacer Fig A 18 Separate member used to provide adequate shaft shoulder diameter Spacer Snap ring Fig A 19 Separate member used to provide adequate housing backing diameter Fig A 20 Bearing setting devices direct mounting Cup Carrier Spacer Snap Ring Cup Follower mounting designs continued Split Spacer Spacer Snap Ring Carrier Cup carrier Engineering A A100 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A101 A100 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A101 With an indirect mounting roller small ends pointing inwards bearing setting can be achieved by a wide variety of devices Fig A 21 In applications requiring precision class bearings a special precision nut can be used This has a soft metal shoe that is clamped against the threads with a locking screw Other solutions can use split nut and or ground spacers where setting cannot be altered Fig A 22 Snap rings In instances where snap rings are used to locate bearing components it is important that they are of sufficient section to provide positive location Care must be taken during installation or removal of the snap ring to prevent damage to the bearing cage Removal Suitable means must be provided on adjacent bearing parts for easy bearing removal Knockout slots puller grooves and axial holes can be designed into the backing surfaces to ease removal of the cup or cone for servicing Fig A 23 In specific cases hydraulic devices can also be used Backing diameters Backing diameters fillet clearances and cage clearances are listed for each individual part number in the bearing tables Backing shoulder diameters shown should be considered as minimum values for shafts and maximum values for housings NOTE Do not use a backing diameter that provides less backing surface than suggested End plateStake nutLocknuts Locknut with tongued washer Fig A 21 Bearing setting devices indirect mounting Locking screw Precision Nut with Soft Metal Shoe Fig A 22 Setting devices using split nut and precision nut with soft metal shoe Fig A 23 Removal slots or puller grooves to ease removal mounting designs continued A100 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A101 Engineering A A100 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A101 Seating Geometry Two major causes of misalignment occur when the seats of cones and or cups are machined out of square with the bearing axis or when the seats are parallel but out of alignment Surface finishes standard bearings For industrial applications please refer to the following guidelines Ground shafts All roller bearing shaft seats should be ground to a surface finish of 1 6 m 65 in Ra maximum wherever possible Ball bearing seats should be 0 8 m 32 in for shafts under 2 inches and 1 6 m 65 in for all other sizes turned shafts When shaft seats are turned a tighter heavy duty fit should be used In this case the shaft diameter should be turned to a finish of 3 2 m 125 in Ra maximum housing bores Housing bores should be finished to 3 2 m 125 in Ra maximum Surface finishes precision bearings Precision class bearings should be mounted on shafts and in housings that are finished to at least the same precision limits as the bearing bore or outside diameter Furthermore high quality surface finishes together with close machining tolerances of bearing seats must also be provided The following tabulations give some guidelines for all these criteria Tapered roller bearings surface finish R a m in Bearing Class all Sizes C B A AA 3 0 00 000 Shaft 0 8 0 6 0 4 0 2 32 24 15 7 Housing 1 6 0 8 0 6 0 4 65 32 24 15 The choice of fitting practices will mainly depend upon the following parameters Precision class of the bearing Rotating or stationary race Type of layout single double row bearings Type and direction of load continuous alternate rotating Particular running conditions like shocks vibrations overloading or high speed Capability for machining the seats grinding turning or boring Shaft and housing section and material Mounting and setting conditions Preadjusted tapered roller bearings must be mounted with the suggested fit Correct fitting practice and precise bearing setting both affect bearing life rigidity and in the case of precision bearings accuracy Improper fits will lead to problems such as poor machine performance including creeping of the cone on the spindle or the cup in the housing and lack of spindle stiffness Shaft and Housing Fits Below is a graphical representation of shaft and housing fit selection for these bearings conforming to ANSI ABMA Standard 7 The bars designated by g6 h6 etc represent shaft housing diameter and tolerance ranges to achieve various loose and interference fits required for various load and ring rotation conditions Tight Fit Range Nominal Bearing Bore Bore Tolerance Loose Fit Range g6 h6 h5 j5j6 k5 k6 m5 m6 n6 p6 r6r7 Shaft O D Tolerance Range Housing Bore Tolerance Range Tight Fit Range Nominal Bearing O D O D Tolerance Loose Fit Range F7 G7 H8 H7 H6 J7J6 K6K7 M6 M7 N6N7 P6P7 mounting designs continued Engineering A A102 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A103 A102 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A103 Fitting practices Tapered Roller Bearings The design of a Timken tapered roller bearing allows the setting of bearing internal clearance during installation to optimize bearing operation General industrial application fitting practice standards for cones and cups are shown in the following tables These tables apply to solid or heavy sectioned steel shafts heavy sectioned ferrous housings and normal operating conditions To use the tables it is necessary to determine if the member is rotating or stationary the magnitude direction and type of loading and the shaft finish Certain table fits may not be adequate for light shaft and housing sections shafts other than steel nonferrous housings critical operation conditions such as high speed unusual thermal or loading conditions or a combination thereof Also assembly procedures and the means and ease of obtaining the bearing setting may require special fits In these cases experience should be used as a guideline or your Timken representative should be consulted for review and suggestions Rotating cones generally should be applied with an interference fit In special cases loose fits may be considered if it has been determined by test or experience they will perform satisfactorily The term rotating cone describes a condition in which the cone rotates relative to the load This may occur with a rotating cone under a stationary load or a stationary cone with a rotating load Loose fits will permit the cones to creep and wear the shaft and the backing shoulder This will result in excessive bearing looseness and possible bearing and shaft damage Stationary cone fitting practice depends on the application Under conditions of high speed heavy loads or shock interference fits using heavy duty fitting practice should be used With cones mounted on unground shafts subjected to moderate loads no shock and moderate speeds a metal to metal or near zero average fit is used In sheave and wheel applications using unground shafts or in cases using ground shafts with moderate loads no shock a minimum fit near zero to a maximum looseness which varies with the cone bore size is suggested In stationary cone applications requiring hardened and ground spindles a slightly looser fit may be satisfactory Special fits may also be necessary on installations such as multiple sheave crane blocks Rotating cup applications where the cup rotates relative to the load should always use an interference fit Stationary nonadjustable and fixed single row cup applications should be applied with a tight fit wherever practical Generally adjustable fits may be used where the bearing setup is obtained by sliding the cup axially in the housing bore However in certain heavy duty high load applications tight fits are necessary to prevent pounding and plastic deformation of the housing Tightly fitted cups mounted in carriers can be used Tight fits should always be used when the load rotates relative to the cup To permit through boring when the outside diameters of single row bearings mounted at each end of a shaft are equal and one is adjustable and the other fixed it is suggested that the same adjustable fit be used at both ends However tight fits should be used if cups are backed against snap rings to prevent excessive dishing of snap rings groove wear and possible loss of ring retention Only cups with a maximum housing fillet radius requirement of 1 3 mm 0 05 in or less should be considered for a snap ring backing Two row stationary double cups are generally mounted with loose fits to permit assembly and disassembly The loose fit also permits float when a floating bearing is mounted in conjunction with an axially fixed bearing on the other end of the shaft The fitting practice tables that follow have been prepared for both metric and inch dimensions For the inch system bearings classes 4 and 2 standard and classes 3 0 and 00 precision have been included The metric system bearings that have been included are Classes K and N metric system standard bearings and classes C B and A metric system precision bearings Precision class bearings should be mounted on shafts and in housings which are similarly finished to at least the same precision limits as the bearing bore and O D High quality surface finishes should also be provided Two row and four row bearings which are provided with spacers and shipped as matched assemblies have been preset to a specific bench endplay The specific endplay setting is determined from a study of the bearing mounting and expected environment It is dependent on the fitting practice and the required mounted bearing settings A102 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A103 Engineering A A102 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A103 fitting practices continued For rolling mill neck fitting practice consult your Timken representative For all other equipment associated with the rolling mill industry the fitting practice suggestions in the tables that follow should be used In addition to all other axial tolerances and the overall bearing width tolerance the width increase due to tight fits of the cone or cup or both must be considered when axial tolerance summation calculations are made By knowing the fit range the minimum and maximum bearing width increase can be determined to establish the initial design dimensions For instance all tolerances plus the bearing width increase range due to tight fits must be known in order to calculate the shim gap range that would occur on a cup adjusted direct mounting design In a factory preset bearing or a SET RIGHT TM mounting where the bearing overall width is fixed and clamped tight fits will cause cup expansion or cone contraction which will reduce the internal clearance endplay within the bearing Endplay Removed for Single Cone 0 5 K d 0 39 do The following equations under Normal Sections and Thin Wall Sections can be used to calculate endplay removed in a similar manner where K Tapered Roller Bearing Radial to Axial Dynamic Load Rating Factor d Bearing Bore Diameter do Mean Inner Race Diameter Do Mean Outer Race Diameter dS Shaft Inside Diameter D Bearing Outside Diameter DH Housing Outside Diameter Interference Fit of Inner Race on Shaft Interference Fit of Outer Race in Housing Effect of tight Fits on Bearing Width Normal Sections The interference fit of either the cone or the cup increases the overall bearing width For solid steel shafts and heavy sectioned steel housings the increased bearing width for a single row bearing is as follows Refer to diagram to the left Bearing Width Increase for Single Cone 0 5 K d 0 39 do Bearing Width Increase for Single Cup 0 5 K D o 0 39 D If the shaft or housing material is other than steel consult your Timken representative Thin Wall Sections Interference fits on thin walled steel shafts and light sectioned steel housings have a tendency to collapse the cone seat and stretch the cup seat causing less change in bearing width than when used with solid shafts and heavy housings The bearing width change due to tight fits on thin bearing seat sections is as follows Refer to diagram to the left Bearing Width Increase for Single Cone Bearing Width Increase for Single Cup These equations apply only to steel shafts and housings 1 Do 2 DH 0 5 K 0 39 0 5 K 0 39 H S DH DoDdo ds d S H S H S Do 1 D 2 D DH Bearing diameter 1 dS 2 do d 1 dS 2 d o d Engineering A A104 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A105 A104 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A105 SHAFT O D m fitting practices continued fitting guidelines for metric bearings iso and j prefix industrial equipment bearing classes k and n Deviation from nominal maximum bearing bore and resultant fit m T Tight L Loose Bearing bore Rotating shaft Rotating or stationary shaft Ground Unground or Ground Range Tolerance Constant loads with Heavy Loads or High mm m moderate shock Speed or Shock over incl Symbol Shaft O D Resultant Symbol Shaft O D Resultant Deviation Fit Deviation Fit 10 18 12 m6 18 30T n6 23 35T h6 0 12T g6 6 6T g6 6 6T f6 16 4L 0 7 7T 12 12T 11 11L 17 17L 17 17L 27 27L 18 30 12 m6 21 33T n6 28 40T h6 0 12T g6 7 5T g6 7 5T f6 20 8L 0 8 8T 15 15T 13 13L 20 20L 20 20L 33 33L 30 50 12 m6 25 37T n6 33 45T h6 0 12T g6 9 3T g6 9 3T f6 25 13L 0 9 9T 17 17T 16 16L 25 25L 25 25L 41 41L 50 80 15 m6 30 45T n6 39 54T h6 0 15T g6 10 5T g6 10 5T f6 30 15L 0 11 11T 20 20T 19 19L 29 29L 29 29L 49 49L 80 120 20 m6 35 55T n6 45 65T h6 0 20T g6 12 8T g6 12 8T f6 36 16L 0 13 13T 23 23T 22 22L 34 34L 34 34L 58 58L 120 180 25 m6 40 65T p6 68 93T h6 0 25T g6 14 11T g6 14 11T f6 43 18L 0 15 15T 43 43T 25 25L 39 39L 39 39L 68 68L 180 200 106 136T 77 77T 200 225 30 m6 46 76T r6 109 139T h6 0 30T g6 15 15T g6 15 15T f6 50 20L 0 17 17T 80 80T 29 29L 44 44L 44 44L 79 79L 225 250 113 143T 84 84T 250 280 126 161T 35 m6 52 87T r6 94 94T h6 0 35T g6 17 18T g6 17 18T f6 56 21L 280 315 0 20 20T 130 165T 32 32L 49 49L 49 49L 88 88L 98 98T 315 355 144 184T 40 n6 73 113T r6 108 108T h6 0 40T g6 18 22T g6 18 22T 355 400 0 37 37T 150 190T 36 36L 54 54L 54 54L 114 114T 400 450 166 211T 45 n6 80 125T r6 126 126T h6 0 45T g6 20 25T g6 20 25T 450 500 0 40 40T 172 217T 40 40L 60 60L 60 60L 132 132T 500 560 194 244T 50 n6 88 138T r6 150 150T h6 0 50T g6 22 28T g6 22 28T 560 630 0 44 44T 199 249T 44 44L 66 66L 66 66L 155 155T 630 710 255 335T 80 n7 130 210T r7 175 175T h7 0 80T g7 24 56T g7 24 56T 710 800 0 50 50T 265 345T 80 80L 104 104L 104 104L 185 185T 800 900 300 400T 100 n7 146 246T r7 210 210T h7 0 100T g7 26 74T g7 26 74T 900 1000 0 56 56T 310 410T 90 90L 116 116L 116 116L 220 220T A104 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A105 Engineering A A104 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A105 Stationary shaft Unground Ground Unground Hardened and Ground Moderate Loads Moderate Loads Sheaves Wheels wheel Spindles No Shock No Shock Idlers Symbol Shaft O D Resultant Symbol Shaft O D Resultant Symbol Shaft O D Resultant Symbol Shaft O D Resultant Deviation Fit Deviation Fit Deviation Fit Deviation Fit 10 18 12 m6 18 30T n6 23 35T h6 0 12T g6 6 6T g6 6 6T f6 16 4L 0 7 7T 12 12T 11 11L 17 17L 17 17L 27 27L 18 30 12 m6 21 33T n6 28 40T h6 0 12T g6 7 5T g6 7 5T f6 20 8L 0 8 8T 15 15T 13 13L 20 20L 20 20L 33 33L 30 50 12 m6 25 37T n6 33 45T h6 0 12T g6 9 3T g6 9 3T f6 25 13L 0 9 9T 17 17T 16 16L 25 25L 25 25L 41 41L 50 80 15 m6 30 45T n6 39 54T h6 0 15T g6 10 5T g6 10 5T f6 30 15L 0 11 11T 20 20T 19 19L 29 29L 29 29L 49 49L 80 120 20 m6 35 55T n6 45 65T h6 0 20T g6 12 8T g6 12 8T f6 36 16L 0 13 13T 23 23T 22 22L 34 34L 34 34L 58 58L 120 180 25 m6 40 65T p6 68 93T h6 0 25T g6 14 11T g6 14 11T f6 43 18L 0 15 15T 43 43T 25 25L 39 39L 39 39L 68 68L 180 200 106 136T 77 77T 200 225 30 m6 46 76T r6 109 139T h6 0 30T g6 15 15T g6 15 15T f6 50 20L 0 17 17T 80 80T 29 29L 44 44L 44 44L 79 79L 225 250 113 143T 84 84T 250 280 126 161T 35 m6 52 87T r6 94 94T h6 0 35T g6 17 18T g6 17 18T f6 56 21L 280 315 0 20 20T 130 165T 32 32L 49 49L 49 49L 88 88L 98 98T 315 355 144 184T 40 n6 73 113T r6 108 108T h6 0 40T g6 18 22T g6 18 22T 355 400 0 37 37T 150 190T 36 36L 54 54L 54 54L 114 114T 400 450 166 211T 45 n6 80 125T r6 126 126T h6 0 45T g6 20 25T g6 20 25T 450 500 0 40 40T 172 217T 40 40L 60 60L 60 60L 132 132T 500 560 194 244T 50 n6 88 138T r6 150 150T h6 0 50T g6 22 28T g6 22 28T 560 630 0 44 44T 199 249T 44 44L 66 66L 66 66L 155 155T 630 710 255 335T 80 n7 130 210T r7 175 175T h7 0 80T g7 24 56T g7 24 56T 710 800 0 50 50T 265 345T 80 80L 104 104L 104 104L 185 185T 800 900 300 400T 100 n7 146 246T r7 210 210T h7 0 100T g7 26 74T g7 26 74T 900 1000 0 56 56T 310 410T 90 90L 116 116L 116 116L 220 220T Engineering A A106 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A107 A106 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A107 Housing bore m Deviation from nominal maximum bearing bore and resultant fit m T Tight L Loose Bearing O D Stationary housing Range Tolerance Floating or Clamped Race mm m over incl Symbol Housing Bore Resultant Deviation fit 18 30 0 G7 7 7L J7 9 9T P7 35 35T R7 41 41T 12 28 40L 12 24L 14 2T 20 8T 30 50 0 G7 9 9L J7 11 11T P7 42 42T R7 50 50T 14 34 48L 14 28L 17 3T 25 11T 50 65 60 60T 0 G7 10 10L J7 12 12T P7 51 51T R7 30 14T 65 80 16 40 56L 18 34L 21 5T 62 62T 32 16T 80 100 73 73T 0 G7 12 12L J7 13 13T P7 59 59T R7 38 20T 100 120 18 47 65L 22 40L 24 6T 76 76T 41 23T 120 140 88 88T 0 G7 14 14L J7 14 14T P7 68 68T R7 48 28T 140 150 20 54 74L 26 46L 28 8T 90 90T 50 30T 150 160 90 90T 0 G7 14 14L J7 14 14T P7 68 68T R7 50 25T 160 180 25 54 79L 26 51L 28 3T 93 93T 53 28T 180 200 106 106T 60 30T 200 225 0 G7 15 15L J7 16 16T P7 79 79T R7 109 109T 30 61 91L 30 60L 33 3T 63 33T 225 250 113 113T 67 37T 250 280 126 126T 0 G7 17 17L J7 16 16T P7 88 88T R7 74 39T 280 315 35 69 104L 36 71L 36 1T 130 130T 78 43T 315 355 144 144T 0 F7 62 62L J7 18 18T P7 98 98T R7 87 47T 355 400 40 119 159L 39 79L 41 1T 150 150T 93 53T 400 450 166 166T 0 F7 68 68L J7 20 20T P7 108 108T R7 103 58T 450 500 45 131 176L 43 88L 45 0 172 172T 109 64T 500 560 220 220T 0 F7 76 76L JS7 35 35T P7 148 148T R7 150 100T 560 630 50 146 196L 35 85L 78 28T 225 225T 155 105T 630 710 255 255T 0 F7 80 80L JS7 40 40T P7 168 168T R7 175 95T 710 800 80 160 240L 40 120L 88 8T 245 265T 185 105T 800 900 300 300T 0 F7 86 86L JS7 45 45T P7 190 190T R7 210 110T 900 1000 100 176 276L 45 145L 100 0 310 310T 220 120T fitting practices continued Fitting guidelines for metric bearings ISO and J Prefix Industrial equipment bearing classes K and N A106 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A107 Engineering A A106 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A107 Stationary housing Rotating housing Adjustable Race Non adjustable Race Non adjustable Race or in or in Carrier Carrier or Sheave Clamped Race Symbol Housing Bore Resultant Symbol Housing Bore Resultant Symbol Housing Bore Resultant Deviation Fit Deviation Fit Deviation Fit 18 30 0 G7 7 7L J7 9 9T P7 35 35T R7 41 41T 12 28 40L 12 24L 14 2T 20 8T 30 50 0 G7 9 9L J7 11 11T P7 42 42T R7 50 50T 14 34 48L 14 28L 17 3T 25 11T 50 65 60 60T 0 G7 10 10L J7 12 12T P7 51 51T R7 30 14T 65 80 16 40 56L 18 34L 21 5T 62 62T 32 16T 80 100 73 73T 0 G7 12 12L J7 13 13T P7 59 59T R7 38 20T 100 120 18 47 65L 22 40L 24 6T 76 76T 41 23T 120 140 88 88T 0 G7 14 14L J7 14 14T P7 68 68T R7 48 28T 140 150 20 54 74L 26 46L 28 8T 90 90T 50 30T 150 160 90 90T 0 G7 14 14L J7 14 14T P7 68 68T R7 50 25T 160 180 25 54 79L 26 51L 28 3T 93 93T 53 28T 180 200 106 106T 60 30T 200 225 0 G7 15 15L J7 16 16T P7 79 79T R7 109 109T 30 61 91L 30 60L 33 3T 63 33T 225 250 113 113T 67 37T 250 280 126 126T 0 G7 17 17L J7 16 16T P7 88 88T R7 74 39T 280 315 35 69 104L 36 71L 36 1T 130 130T 78 43T 315 355 144 144T 0 F7 62 62L J7 18 18T P7 98 98T R7 87 47T 355 400 40 119 159L 39 79L 41 1T 150 150T 93 53T 400 450 166 166T 0 F7 68 68L J7 20 20T P7 108 108T R7 103 58T 450 500 45 131 176L 43 88L 45 0 172 172T 109 64T 500 560 220 220T 0 F7 76 76L JS7 35 35T P7 148 148T R7 150 100T 560 630 50 146 196L 35 85L 78 28T 225 225T 155 105T 630 710 255 255T 0 F7 80 80L JS7 40 40T P7 168 168T R7 175 95T 710 800 80 160 240L 40 120L 88 8T 245 265T 185 105T 800 900 300 300T 0 F7 86 86L JS7 45 45T P7 190 190T R7 210 110T 900 1000 100 176 276L 45 145L 100 0 310 310T 220 120T Engineering A A108 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A109 A108 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A109 fitting practices continued Fitting guidelines for inch bearings Industrial equipment bearing classes 4 and 2 0 76 2 0 38 38 T 13 25 12 T 0 3 0000 0 15 15T 5 10 5T 76 2 88 9 3 0000 3 5000 88 9 114 3 3 5000 4 5000 114 3 139 7 4 5000 5 5000 139 7 165 1 5 5000 6 5000 165 1 19 0 5 0 64 64 T 25 38 13 T 6 5000 7 5000 0 25 25T 10 15 5T 190 5 215 9 7 5000 8 5000 215 9 241 3 8 5000 9 5000 241 3 266 7 9 5000 10 5000 266 7 292 1 10 5000 11 5000 292 1 3 04 8 11 5000 12 0000 304 8 317 5 12 0000 12 5000 0 127 127 T 51 76 25 T 317 5 342 9 0 50 50T 20 30 10T 12 5000 13 5000 Deviation from nominal minimum bearing bore and resultant fit m 0 0001 inch T Tight L Loose Bearing bore Rotating shaft Ground Range Tolerance Constant loads with mm inches m 0 0001 in moderate shock over incl Shaft O D Resultant Deviation Fit SHAFT O D m INCHES Suggested heavy duty fitting practices shown above are applicable for case carburized bearings Consult your Timken representative for the suggested heavy duty fitting practices that are specified for through hardened bearings A108 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A109 Engineering A A108 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A109 64 64 T 13 13 T 0 0 0 0 5 5 L 38 25 T 0 13 L 13 26L 13 26 L 18 31 L 25 25T 5 5T 0 0 0 0 2 2L 15 10T 0 5L 5 10L 5 10L 7 12L 76 76 T 51 25 T 30 30T 20 10T 76 76 T 51 25 T 30 30T 20 10T 89 89 T 64 38 T 35 35T 25 15T 102 1 02T 76 51 T 40 40T 30 20T 114 114 T 25 25 T 0 0 0 0 5 5L 89 64 T 0 25 L 25 50L 25 5 0L 30 55 L 45 45T 10 10T 0 0 0 0 2 2L 35 25T 0 10L 10 20L 10 20L 12 22L 127 127 T 102 76 T 50 50T 40 30T 140 14 0T 114 89 T 55 55T 45 35T 152 152 T 127 1 02T 60 60T 50 40T 165 165 T 140 114 T 65 65T 55 45T 178 178 T 152 127 T 70 70T 60 50T 203 2 03T 152 1 01T 80 80T 51 51 T 0 0 0 0 60 40T 0 51 L 51 102L 51 102L 216 216 T 20 20T 0 0 0 0 165 114 T 0 20L 20 40L 20 40L 85 85T 65 45T rotating or stationary shaft Stationary shaft Unground or Ground Unground Ground Unground Hardened and Ground Heavy Loads Moderate Loads Moderate Loads Sheaves Wheels Wheel High Speed or Shock No Shock No Shock Idlers Spindles Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Engineering A A110 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A111 A110 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A111 fitting practices continued Fitting guidelines for inch bearings Industrial equipment bearing classes 4 and 2 342 9 368 3 13 5000 14 5000 368 3 393 7 14 5000 15 5000 393 7 419 1 15 5000 16 5000 419 1 444 5 16 5000 17 5000 444 5 469 9 17 5000 18 5000 469 9 495 3 0 127 127 T 51 76 25 T 18 5000 19 5000 0 50 50T 20 30 10T 495 3 52 0 7 19 5000 20 5000 520 7 546 1 20 5000 21 5000 546 1 571 5 21 5000 22 5000 571 5 596 9 22 5000 23 5000 596 9 6 09 6 23 5000 24 0000 609 6 914 4 0 190 19 0T 76 114 38 T 24 0000 36 0000 0 75 75T 30 45 15T 914 4 1219 2 0 252 252 T 102 150 48 T 36 0000 48 0000 0 100 100T 40 60 20T 1219 2 0 305 3 05T 127 178 51 T 48 0000 0 120 120T 50 70 20T Deviation from nominal minimum bearing bore and resultant fit m 0 0001 inch T Tight L Loose Bearing bore Rotating shaft Ground Range Tolerance Constant loads with mm inches m 0 0001 in moderate shock over incl Shaft O D Resultant Deviation Fit SHAFT O D m INCHES Suggested heavy duty fitting practices shown above are applicable for case carburized bearings Consult your Timken representative for the suggested heavy duty fitting practices that are specified for through hardened bearings A110 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A111 Engineering A A110 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A111 229 229 T 178 127 T 90 90T 70 50T 241 241 T 190 139 T 95 95T 75 55T 254 254 T 203 152 T 100 100T 80 60T 267 267 T 216 165 T 105 105T 85 65T 279 279 T 229 178 T 110 110T 90 70T 292 292 T 51 51 T 0 0 0 0 241 19 0T 0 51 L 51 1 02L 51 1 02L 115 115T 20 20T 0 0 0 0 95 75T 0 20L 20 40L 20 40L 305 3 05T 254 2 03T 120 120T 100 80T 318 318 T 267 216 T 125 125T 105 85T 330 33 0T 279 228 T 130 130T 110 90T 343 343 T 292 241 T 135 135T 115 95T 356 356 T 305 254 T 140 140T 120 100T 457 457 T 76 76 T 0 0 0 0 331 3 05T 0 76 L 76 152 L 76 152 L 180 180T 30 30T 0 0 0 0 150 120T 0 30L 30 60L 30 60L 625 625 T 102 1 02T 0 0 0 0 534 432 T 0 1 02L 102 2 04L 102 2 04L 250 250T 40 40T 0 0 0 0 210 170T 0 40L 40 80L 40 80L 813 813 T 127 127 T 0 0 0 0 686 559 T 0 127 L 127 254 L 127 254 L 320 320T 50 50T 0 0 0 0 270 220T 0 50L 50 100L 50 100L rotation or stationary shaft Stationary shaft Unground or Ground Unground Ground Unground Hardened and Ground Heavy Loads Moderate Loads Moderate Loads Sheaves Wheels Wheel High Speed or Shock No Shock No Shock Idlers Spindles Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Engineering A A112 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A113 A112 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A113 fitting practices continued Fitting guidelines for inch bearings Industrial equipment bearing classes 4 and 2 Unclamped race design is applicable only to sheaves with negligible fleet angle 0 76 2 25 51 26L 0 25T 38 63T 76 101T 0 76 76L 25 25L 13 13T 51 51T 76 2 127 25 51 26L 0 25T 51 76T 76 101T 0 76 76L 25 25L 25 25T 51 51T 127 304 8 25 51 26L 0 25T 51 76T 76 101T 0 76 76L 51 51L 25 25T 51 51T 304 8 609 6 51 102 51L 26 25T 76 127T 102 153T 0 152 152L 76 76L 25 25T 51 51T 609 6 914 4 76 152 76L 51 25T 102 178T 0 229 229L 127 127L 25 25T 914 4 1219 2 102 204 102L 76 25T 127 229T 0 305 305L 178 178L 25 25T 1219 2 127 254 127L 102 25T 152 279T 0 381 381L 229 229L 25 25T Deviation from nominal minimum bearing bore and resultant fit m T Tight L Loose Bearing O D Stationary Housing Range Tolerance Floating or Clamped mm m Race over incl Housing Bore Resultant Deviation Fit Housing Bore m Unclamped race design is applicable only to sheaves with negligible fleet angle 0 3 0000 10 20 10L 0 10T 15 25T 30 40T 0 30 30L 10 10L 5 5T 20 20T 3 0000 5 0000 10 20 10L 0 10T 20 30T 30 40T 0 30 30L 10 10L 10 10T 20 20T 5 0000 12 0000 10 20 10L 0 10T 20 30T 30 40T 0 30 30L 20 20L 10 10T 20 20T 12 0000 24 0000 20 40 20L 10 10T 30 50T 40 60T 0 60 60L 30 30L 10 10T 20 20T 24 0000 36 0000 30 60 30L 20 10T 40 70T 0 90 90L 50 50L 10 10T 36 0000 48 0000 40 80 40L 30 10T 50 90T 0 120 120L 70 70L 10 10T 48 0000 50 100 50L 40 10T 60 110T 0 150 150L 90 90L 10 10T Deviation from nominal minimum bearing bore and resultant fit 0 0001 inch T Tight L Loose Bearing O D Stationary Housing Range Tolerance Floating or Clamped inches 0 0001 in Race over incl Housing Bore Resultant Deviation Fit Housing Bore inches A112 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A113 Engineering A A112 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A113 Stationary Housing Stationary or Rotation Housing Rotating Housing Adjustable Race Non adjustable Race or In Sheave unclamped Race Carrier or Sheave Clamped Race Housing bore Resultant Housing Bore Resultant Housing Bore Resultant Deviation Fit Deviation Fit Deviation Fit 0 76 2 25 51 26L 0 25T 38 63T 76 101T 0 76 76L 25 25L 13 13T 51 51T 76 2 127 25 51 26L 0 25T 51 76T 76 101T 0 76 76L 25 25L 25 25T 51 51T 127 304 8 25 51 26L 0 25T 51 76T 76 101T 0 76 76L 51 51L 25 25T 51 51T 304 8 609 6 51 102 51L 26 25T 76 127T 102 153T 0 152 152L 76 76L 25 25T 51 51T 609 6 914 4 76 152 76L 51 25T 102 178T 0 229 229L 127 127L 25 25T 914 4 1219 2 102 204 102L 76 25T 127 229T 0 305 305L 178 178L 25 25T 1219 2 127 254 127L 102 25T 152 279T 0 381 381L 229 229L 25 25T Stationary Housing Stationary or Rotation Housing Rotating Housing Adjustable Race Non adjustable Race or In Sheave unclamped Race Carrier or Sheave Clamped Race Housing bore Resultant Housing Bore Resultant Housing Bore Resultant Deviation Fit Deviation Fit Deviation Fit 0 3 0000 10 20 10L 0 10T 15 25T 30 40T 0 30 30L 10 10L 5 5T 20 20T 3 0000 5 0000 10 20 10L 0 10T 20 30T 30 40T 0 30 30L 10 10L 10 10T 20 20T 5 0000 12 0000 10 20 10L 0 10T 20 30T 30 40T 0 30 30L 20 20L 10 10T 20 20T 12 0000 24 0000 20 40 20L 10 10T 30 50T 40 60T 0 60 60L 30 30L 10 10T 20 20T 24 0000 36 0000 30 60 30L 20 10T 40 70T 0 90 90L 50 50L 10 10T 36 0000 48 0000 40 80 40L 30 10T 50 90T 0 120 120L 70 70L 10 10T 48 0000 50 100 50L 40 10T 60 110T 0 150 150L 90 90L 10 10T Engineering A A114 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A115 A114 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A115 fitting practices continued Fitting guidelines for PRECISION bearings Deviation from nominal minimum bearing bore and resultant fit m 0 0001 inch T Tight L Loose Bearing BORE Class 3 and 0 1 Class 00 and 000 Range Bearing Bore Shaft O D Resultant Bearing Bore Shaft O D Resultant mm inches Tolerance Deviation Fit Tolerance Deviation Fit over incl m 0 0001 in Shaft O D inch bearings 304 8 0 30 30T 0 20 20T 13 18 5T 8 13 5T 12 0 12 12T 0 8 8T 5 7 2T 3 5 2T 304 8 609 6 0 64 64T 25 38 13T 12 24 0 25 25T 10 15 5T 609 6 914 4 0 102 102T 38 64 26T 24 36 0 40 40T 15 25 10T Shaft O D Metric BEARINGS ISO J Prefix Deviation from nominal maximum bearing bore and resultant fit m T Tight L Loose Bearing BORE Class C Range Bearing Bore Symbol Shaft O D Resultant Tolerance Deviation Fit over incl m 10 18 7 k5 9 16T 5 k5 9 14T 10 18 5 k4 6 11T 0 1 1T 0 1 1T 0 1 1T 18 30 8 k5 11 19T 6 k5 11 17T 18 30 6 k4 8 14T 0 2 2T 0 2 2T 0 2 2T 30 50 10 k5 13 23T 8 k5 13 21T 30 315 8 13 21T 0 2 2T 0 2 2T 0 5 5T 50 80 12 k5 15 27T 9 k5 15 24T 0 2 2T 0 2 2T 80 120 15 k5 18 33T 10 k5 18 28T 0 3 3T 0 3 3T 120 180 18 k5 21 39T 13 k5 21 34T 0 3 3T 0 3 3T 180 250 22 k5 24 46T 15 k5 24 39T 0 4 4T 0 4 4T 250 315 22 k5 27 49T 15 k5 27 42T 0 4 4T 0 4 4T 1 Class 0 made only to 304 8 mm 12 inch O D A114 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A115 Engineering A A114 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A115 fitting practices continued CLASS B Bearing Bore CLASS A AND AA Bearing Bore Symbol Shaft O D Resultant Range Bearing Bore Symbol Shaft O D Resultant Tolerance Deviation Fit mm Tolerance Deviation Fit over incl 10 18 7 k5 9 16T 5 k5 9 14T 10 18 5 k4 6 11T 0 1 1T 0 1 1T 0 1 1T 18 30 8 k5 11 19T 6 k5 11 17T 18 30 6 k4 8 14T 0 2 2T 0 2 2T 0 2 2T 30 50 10 k5 13 23T 8 k5 13 21T 30 315 8 13 21T 0 2 2T 0 2 2T 0 5 5T 50 80 12 k5 15 27T 9 k5 15 24T 0 2 2T 0 2 2T 80 120 15 k5 18 33T 10 k5 18 28T 0 3 3T 0 3 3T 120 180 18 k5 21 39T 13 k5 21 34T 0 3 3T 0 3 3T 180 250 22 k5 24 46T 15 k5 24 39T 0 4 4T 0 4 4T 250 315 22 k5 27 49T 15 k5 27 42T 0 4 4T 0 4 4T Engineering A A116 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A117 A116 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A117 fitting practices continued Fitting guidelines for PRECISION bearings 1 Class O made only to 304 8 mm 12 inch O D 152 4 13 13 26T 25 12L 0 13T 0 0 0 38 38L 13 13L 6 5 5 10T 10 5L 0 5T 0 0 0 15 15L 5 5L 152 4 304 8 13 25 38T 25 12L 0 13T 0 0 0 38 38L 25 25L 6 12 5 10 15T 10 5L 0 5T 0 0 0 15 15L 10 10L 304 8 609 6 25 25 50T 38 13L 0 25T 0 0 0 64 64L 25 25L 12 24 10 10 20T 15 5L 0 10T 0 0 0 25 25L 10 10L 609 6 914 4 38 38 76T 51 13L 0 38T 0 0 0 89 89L 38 38L 24 36 15 15 30T 20 5L 0 15T 0 0 0 35 35L 15 15L Deviation from nominal minimum bearing O D and resultant fit m 0 0001 inch T Tight L Loose Bearing O D Class 3 and 0 1 Range Tolerance Non adjustable Floating Adjustable mm inches m or In Carrier 0 0001 in Housing Resultant Housing Resultant Housing Resultant over incl Bore Fit Bore Fit Bore Fit Deviation Deviation Deviation Housing Bore INCH BEARINGS 18 30 0 N5 21 21T G5 7 7L K5 8 8T 8 12 4T 16 24L 1 9L 30 50 0 N5 24 24T G5 9 9L K5 9 9T 9 13 4T 20 29L 2 11L 50 80 0 N5 28 28T G5 10 10L K5 10 10T 11 15 4T 23 34L 3 14L 80 120 0 N5 33 33T G5 12 12L K5 13 13T 13 18 5T 27 40L 2 15L 120 150 0 N5 39 39T G5 14 14L K5 15 15T 15 21 6T 32 47L 3 18L 150 180 0 N5 39 39T G5 14 14L K5 15 15T 18 21 3T 32 50L 3 21L 180 250 0 N5 45 45T G5 15 15L K5 18 18T 20 25 5T 35 55L 2 27L 250 315 0 N5 50 50T G5 17 17L K5 20 20T 25 27 2T 40 65L 3 28L Deviation from nominal maximum bearing O D and resultant fit m T Tight L Loose Bearing O D Class C Range Tolerance Non adjustable Floating Adjustable mm m or In Carrier Symbol Housing Resultant Symbol Housing Resultant Symbol Housing Resultant over incl Bore Fit Bore Fit Bore Fit Deviation Deviation Deviation Housing Bore METRIC BEARINGS A116 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A117 Engineering A A116 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A117 0 315 0 16 16T 8 8L 8 8T 8 8 0 16 24L 0 8L Bearing O D Class A and AA Range Tolerance Non adjustable Floating Adjustable mm m or In Carrier 0 0001 in Housing Resultant Housing Resultant Housing Resultant over incl Bore Fit Bore Fit Bore Fit Deviation Deviation Deviation 0 304 8 8 8 16T 15 7L 0 8T 0 0 0 23 23L 8 8L 0 12 3 3 6T 6 3L 0 3T 0 0 0 9 9L 3 3L Bearing O D Class 00 and 000 Range Tolerance Non adjustable Floating Adjustable mm inches m or In Carrier 0 0001 in Housing Resultant Housing Resultant Housing Resultant over incl Bore Fit Bore Fit Bore Fit Deviation Deviation Deviation 18 30 0 M5 14 14T G5 7 7L K5 8 8T 6 5 1L 16 22L 1 7L 30 50 0 M5 16 16T G5 9 9L K5 9 9T 7 5 2L 20 27L 2 9L 50 80 0 M5 19 19T G5 10 10L K5 10 10T 9 6 3L 23 32L 3 12L 80 120 0 M5 23 23T G5 12 12L K5 13 13T 10 8 2L 27 37L 2 12L 120 150 0 M5 27 27T G5 14 14L K5 15 15T 11 9 2L 32 43L 3 12L 150 180 0 M5 27 27T G5 14 14L K5 15 15T 13 9 4L 32 45L 3 16L 180 250 0 M5 31 31T G5 15 15L K5 18 18T 15 11 4L 35 50L 2 17L 250 315 0 M5 36 36T G5 17 17L K5 20 20T 18 13 5L 40 58L 3 21L Bearing O D Class B Range Tolerance Non adjustable Floating Adjustable mm inches m or In Carrier Symbol Housing Resultant Symbol Housing Resultant Symbol Housing Resultant over incl Bore Fit Bore Fit Bore Fit Deviation Deviation Deviation Engineering A A118 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A119 A118 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A119 Fitting guidelines for inch bearings Automotive equipment bearing classes 4 and 2 fitting practices continued Deviation from nominal minimum bearing bore and resultant fit m 0 0001 inch T Tight L Loose Shaft O D m INCHES Cone Bore Stationary Cone Rotating Cone Front Wheels Rear Wheels Transaxles Rear Wheels Rear Wheels UNIT BEARING Pinion Differential Transmissions Full Floating Axles Semi floating Axles Semi floating Axles Transfer Cases Trailer Wheels Cross Shafts Non adjustable Non adjustable Non adjustable Clamped Collapsible Spacer Non adjustable Non adjustable Non adjustable Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant over incl Tolerance Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit mm mm m m m m m m m m m m m m m m m m m 0 76 200 0 5 5L 51 51T 56 56T 38 38T 30 30T 51 51T 102 102T 38 38T 13 18 31L 38 25T 38 25T 25 13T 18 5T 38 25T 64 51T 25 12T 76 200 304 800 0 13 13L 76 76T 63 63T 76 76T 102 102T 64 64T 25 38 63L 51 26T 38 13T 51 26T 76 51T 38 13T in in in in in in in in in in in in in in in in in in in 0 3 0000 0 0002 0002L 0020 0020T 0022 0022 T 0015 0015T 0012 0012T 0020 0020T 0040 0040T 0015 0015T 0005 0007 0012L 0015 0010T 0015 0010 T 0010 0005T 0007 0002T 0015 0010T 0025 0020T 0010 0005T 3 0000 12 0000 0 0005 0005L 0030 0030T 0025 0025T 0030 0030T 0040 0040T 0025 0025T 0010 0015 0025L 0020 0010T 0015 0005T 0020 0010T 0025 0020T 0015 0005T Fitting guidelines for Metric bearings Automotive equipment bearing classes K and N Deviation from nominal maximum bearing bore and resultant fit m 0 0001 inch T Tight L Loose Shaft O D m INCHES Cone Bore Stationary Cone Rotating Cone Front Wheels Rear Wheels Transaxles Rear Wheels Rear Wheels UNIT BEARING Pinion Differential Transmissions Full Floating Axles Semi floating Axles Semi floating Axles Transfer Cases Trailer Wheels Cross Shafts Non adjustable Non adjustable Non adjustable Clamped Collapsible Spacer Non adjustable Non adjustable Non adjustable Resultant Shaft O D Resultant Shaft O D Resultant Shaft o d Resultant Shaft o d Resultant Shaft o d Resultant Shaft o d Resultant Shaft o d Resultant over incl Tolerance Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit mm mm m m m m m m m m m m m m m m m m m 18 30 12 f6 20 8L p6 35 47T p6 35 47T k6 15 27T k6 15 27T p6 35 47T 56 68T m6 21 33T 0 33 33L 22 22T 22 22T 2 2T 2 2T 22 22T 35 35T 8 8T 30 50 12 f6 25 13L p6 42 54T p6 42 54T k6 18 30T k6 18 30T p6 42 54T 68 80T m6 25 37T 0 41 41L 26 26T 26 26T 2 2T 2 2T 26 26T 43 43T 9 9T 50 80 15 f6 30 15L p6 51 66T k6 21 36T k6 21 36T p6 51 66T 89 104T m6 30 45T 0 49 49L 32 32T 2 2T 2 2T 32 32T 59 59T 11 11T 80 120 20 f6 36 16L n6 45 65T j6 13 33T n6 45 65T 114 134T m6 35 55T 0 58 58L 23 23T 9 9L 23 23T 79 79T 13 13T 120 180 25 f6 43 18L n6 52 77T j6 14 39T n6 52 77T 140 165T m6 40 66T 0 68 68L 27 29T 11 11L 27 29T 100 100T 15 15T in in in in in in in in in in in in in in in in in in in 7087 1 1811 0005 f6 0008 0003L p6 0013 0018T p6 0013 0018T k6 0006 0011T k6 0006 0011T p6 0013 0018T 0022 0027T m6 0008 0013T 0 0013 0013L 0008 0008T 0008 0008T 0001 0001T 0001 0001T 0008 0008T 0014 0014T 0003 0003 T 1 1811 1 9865 0005 f6 0010 0005L p6 0016 0021T p6 0016 0021T k6 0007 0012T k6 0007 0012T p6 0016 0021T 0028 0033T m6 0010 0015T 0 0016 0016L 0010 0010T 0010 0010T 0001 0001T 0001 0001T 0010 0010T 0018 0018T 0004 0004T 1 9685 3 1496 0006 f6 0012 0006L p6 0021 0027T k6 0008 0014T k6 0008 0014T p6 0021 0027T 0034 0040T m6 0012 0018T 0 0019 0019L 0014 0014T 0001 0001L 0001 0001L 0014 0014T 0022 0022T 0005 0005T 3 1496 4 7244 0008 f6 0014 0006L n6 0019 0027T j6 0005 0013T n6 0019 0027T 0044 0052T m6 0014 0022T 0 0023 0023L 0010 0010T 0004 0004L 0010 0010T 0030 0030T 0005 0005T 4 7244 7 0866 0010 f6 0016 0006L n6 0022 0032T j6 0006 0016T n6 0022 0032T 0056 0066T m6 0016 0026T 0 0026 0026L 0012 0012T 0004 0004L 0012 0012T 0040 0040T 0006 0006T Heavy duty min fit of 0005 inch per inch of cone bore A118 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A119 Engineering A A118 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A119 Cone Bore Stationary Cone Rotating Cone Front Wheels Rear Wheels Transaxles Rear Wheels Rear Wheels UNIT BEARING Pinion Differential Transmissions Full Floating Axles Semi floating Axles Semi floating Axles Transfer Cases Trailer Wheels Cross Shafts Non adjustable Non adjustable Non adjustable Clamped Collapsible Spacer Non adjustable Non adjustable Non adjustable Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant Shaft O D Resultant over incl Tolerance Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit mm mm m m m m m m m m m m m m m m m m m 0 76 200 0 5 5L 51 51T 56 56T 38 38T 30 30T 51 51T 102 102T 38 38T 13 18 31L 38 25T 38 25T 25 13T 18 5T 38 25T 64 51T 25 12T 76 200 304 800 0 13 13L 76 76T 63 63T 76 76T 102 102T 64 64T 25 38 63L 51 26T 38 13T 51 26T 76 51T 38 13T in in in in in in in in in in in in in in in in in in in 0 3 0000 0 0002 0002L 0020 0020T 0022 0022 T 0015 0015T 0012 0012T 0020 0020T 0040 0040T 0015 0015T 0005 0007 0012L 0015 0010T 0015 0010 T 0010 0005T 0007 0002T 0015 0010T 0025 0020T 0010 0005T 3 0000 12 0000 0 0005 0005L 0030 0030T 0025 0025T 0030 0030T 0040 0040T 0025 0025T 0010 0015 0025L 0020 0010T 0015 0005T 0020 0010T 0025 0020T 0015 0005T Cone Bore Stationary Cone Rotating Cone Front Wheels Rear Wheels Transaxles Rear Wheels Rear Wheels UNIT BEARING Pinion Differential Transmissions Full Floating Axles Semi floating Axles Semi floating Axles Transfer Cases Trailer Wheels Cross Shafts Non adjustable Non adjustable Non adjustable Clamped Collapsible Spacer Non adjustable Non adjustable Non adjustable Resultant Shaft O D Resultant Shaft O D Resultant Shaft o d Resultant Shaft o d Resultant Shaft o d Resultant Shaft o d Resultant Shaft o d Resultant over incl Tolerance Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit mm mm m m m m m m m m m m m m m m m m m 18 30 12 f6 20 8L p6 35 47T p6 35 47T k6 15 27T k6 15 27T p6 35 47T 56 68T m6 21 33T 0 33 33L 22 22T 22 22T 2 2T 2 2T 22 22T 35 35T 8 8T 30 50 12 f6 25 13L p6 42 54T p6 42 54T k6 18 30T k6 18 30T p6 42 54T 68 80T m6 25 37T 0 41 41L 26 26T 26 26T 2 2T 2 2T 26 26T 43 43T 9 9T 50 80 15 f6 30 15L p6 51 66T k6 21 36T k6 21 36T p6 51 66T 89 104T m6 30 45T 0 49 49L 32 32T 2 2T 2 2T 32 32T 59 59T 11 11T 80 120 20 f6 36 16L n6 45 65T j6 13 33T n6 45 65T 114 134T m6 35 55T 0 58 58L 23 23T 9 9L 23 23T 79 79T 13 13T 120 180 25 f6 43 18L n6 52 77T j6 14 39T n6 52 77T 140 165T m6 40 66T 0 68 68L 27 29T 11 11L 27 29T 100 100T 15 15T in in in in in in in in in in in in in in in in in in in 7087 1 1811 0005 f6 0008 0003L p6 0013 0018T p6 0013 0018T k6 0006 0011T k6 0006 0011T p6 0013 0018T 0022 0027T m6 0008 0013T 0 0013 0013L 0008 0008T 0008 0008T 0001 0001T 0001 0001T 0008 0008T 0014 0014T 0003 0003 T 1 1811 1 9865 0005 f6 0010 0005L p6 0016 0021T p6 0016 0021T k6 0007 0012T k6 0007 0012T p6 0016 0021T 0028 0033T m6 0010 0015T 0 0016 0016L 0010 0010T 0010 0010T 0001 0001T 0001 0001T 0010 0010T 0018 0018T 0004 0004T 1 9685 3 1496 0006 f6 0012 0006L p6 0021 0027T k6 0008 0014T k6 0008 0014T p6 0021 0027T 0034 0040T m6 0012 0018T 0 0019 0019L 0014 0014T 0001 0001L 0001 0001L 0014 0014T 0022 0022T 0005 0005T 3 1496 4 7244 0008 f6 0014 0006L n6 0019 0027T j6 0005 0013T n6 0019 0027T 0044 0052T m6 0014 0022T 0 0023 0023L 0010 0010T 0004 0004L 0010 0010T 0030 0030T 0005 0005T 4 7244 7 0866 0010 f6 0016 0006L n6 0022 0032T j6 0006 0016T n6 0022 0032T 0056 0066T m6 0016 0026T 0 0026 0026L 0012 0012T 0004 0004L 0012 0012T 0040 0040T 0006 0006T Heavy duty min fit of 0005 inch per inch of cone bore Engineering A A120 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A121 A120 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A121 Fitting guidelines for inch bearings Automotive equipment bearing classes 4 and 2 Deviation from nominal minimum bearing bore and resultant fit m 0 001 inch Aluminum housings min fit of 001 inch per inch of cup O D Magnesium housings min fit of 0015 inch per inch of cup O D Inch System Bearings Classes 4 and 2 housing bore m INCHES fitting practices continued Cup O D Rotating Cup Stationary Cup Front Wheels Rear Wheels Rear Wheels Semi Differential Split Seat Trans Transfer Pinion Differential Full Floating Floating missions Cases Solid Seat Transaxles Trailer Axles Cross Shafts Transmission Transfer Wheels Cases Non adjustable Adjustable Clamped Adjustable Adjustable Non Adjustable TS TSU Housing Bore Resultant Housing Bore Resultant Housing Bore Resultant Housing Bore Resultant Housing Bore Resultant over incl Tolerance Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit mm mm m m m m m m m m m m m 0 76 200 25 51 76T 38 13L 25 0 0 25T 38 63T 0 13 13T 76 76L 51 51L 25 25L 13 13T 76 200 127 00 25 77 102T 38 13L 25 0 0 25T 51 76T 0 25 25T 76 76L 51 51L 25 25L 25 25T 127 00 304 800 25 77 102T 0 25T 0 25T 77 102T 0 25 25T 51 51L 51 51L 25 25T in in in in in in in in in in in in in 0 3 0000 0010 0020 0030T 0015 0005L 0010 0 0 0010T 0015 0025T 0 0005 0005T 0030 0030L 0020 0020L 0010 0010L 0005 0005T 3 0000 5 0000 0010 0030 0040T 0015 0005L 0010 0 0 0010T 0020 0030T 0 0010 0010T 0030 0030L 0020 0020L 0010 0010L 0010 0010T 5 0000 12 0000 0010 0030 0040T 0 0010T 0 0010T 0030 0040T 0 0010 0010T 0020 0020L 0020 0020L 0010 0010T A120 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A121 Engineering A A120 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A121 Fitting guidelines for metric bearings Automotive equipment bearing classes K and N Deviation from nominal minimum bearing bore and resultant fit m inches Aluminum housings min fit of 001 inch per inch of cup O D Magnesium housings min fit of 0015 inch per inch of cup O D fitting practices continued 30 50 0 R7 50 50T G7 9 9L H7 0 0 K6 13 13T R7 50 50T 14 25 11T 34 48L 25 39L 3 17L 25 11T 50 65 0 R7 60 60T R7 60 60T 16 30 14T G7 10 10L H7 0 0 K6 15 15T 30 14T 65 80 0 R7 62 62T 40 56L 30 46L 4 20L R7 62 62T 16 32 16T 32 16T 80 100 0 R7 73 73T R7 73 73T 18 38 20T G7 12 12L H7 0 0 K6 18 18T 38 20T 100 120 0 R7 76 76T 47 65L 35 53L 4 22L R7 76 76T 18 41 23T 41 23T 120 140 0 R7 88 88T R7 88 88T 20 48 28T G7 14 14L J7 14 14T K6 21 21T 48 28T 140 150 0 R7 90 90T 54 74L 26 46L 4 24L R7 90 90T 20 50 30T 50 30T 150 160 0 R7 90 90T R7 90 90T 25 50 25T G7 14 14L J7 14 14T K6 21 21T 50 25T 160 180 0 R7 93 93T 54 79L 26 51L 4 29L R7 93 93T 25 53 28T 53 28T 180 200 0 R7 106 106T R7 106 106T 30 60 30T 60 30T 200 225 0 R7 109 109T J7 16 16T J7 16 16T R7 109 109T 30 63 33T 30 60L 30 60L 63 33T 225 250 0 R7 113 113T R7 113 113T 30 67 37T 67 37T 250 280 0 R7 126 126T R7 126 126T 35 74 39T J7 16 16T J7 16 16T 74 39T 280 315 0 R7 130 130T 36 71L 36 71L R7 130 130T 35 78 43T 78 43T in in in in in in in in in in in in in 1 1811 1 9685 0 R7 0020 0020T G7 0004 0004L H7 0 0 K6 0005 0005T R7 0020 0020T 0006 0010 0004T 0014 0020L 0010 0016L 0001 0007L 0010 0004T 1 9685 2 5591 0 R7 0023 0023T R7 0023 0023T 0006 0011 0005T G7 0004 0004L H7 0 0 K6 0006 0006T 0011 0005T 2 5591 3 1496 0 R7 0023 0023T 0016 0022L 0012 0018L 0001 0007L R7 0023 0023T 0006 0011 0005T 0011 0005T 3 1496 3 9370 0 R7 0029 0029T R7 0029 0029T 0007 0015 0008T G7 0005 0005L H7 0 0 K6 0007 0007T 0015 0008T 3 9370 4 7244 0 R7 0029 0029T 0019 0026L 0014 0021L 0002 0009L R7 0029 0029T 0007 0015 0008T 0015 0008T 4 7244 5 5118 0 R7 0035 0035T R7 0035 0035T 0008 0019 0011T G7 0006 0006L J7 0006 0006T K6 0008 0008T 0019 0011T 5 5118 5 9055 0 R7 0035 0035T 0022 0030L 0010 0018L 0002 0010L R7 0035 0035T 0008 0019 0011T 0019 0011T 5 9055 6 2992 0 R7 0035 0035T R7 0035 0035T 0010 0019 0009T G7 0006 0006L J7 0006 0006T K6 0008 0008T 0019 0009T 6 2992 7 0866 0 R7 0035 0035T 0022 0032L 0010 0020L 0002 0012L R7 0035 0035T 0010 0019 0009T 0019 0009T 7 0866 7 8740 0 R7 0042 0042T R7 0042 0042T 0012 0024 0012T 0024 0012T 7 8740 8 8583 0 R7 0042 0042T J7 0007 0007T J7 0007 0007T R7 0042 0042T 0012 0024 0012T 0011 0023L 0011 0023L 0024 0012T 8 8583 9 8425 0 R7 0042 0042T R7 0042 0042T 0012 0024 0012T 0024 0012T 9 8425 11 0236 0 R7 0047 0047T R7 0047 0047T 0014 0027 0013T J7 0007 0007T J7 0007 0007T 0027 0013T 11 0236 12 4016 0 R7 0047 0047T 0013 0027L 0013 0027L R7 0047 0047T 0014 0027 0013T 0027 0013T housing bore m INCHES Cup O D Rotating Cup Stationary Cup Front Wheels Rear Wheels Differential Transmissions Pinion Differential Rear Wheels Semi floating Axles Split Seat Transfer Cases Cross Shafts Solid Seat Transaxles Full Floating Axles Transmission Adjustable TS Transfer Cases Non adjustable Clamped TSU Adjustable Adjustable Non Adjustable Housing Bore Resultant Housing Bore Resultant Housing Bore Resultant Housing Bore Resultant Housing Bore Resultant over incl Tolerance Deviation Fit Deviation Fit Deviation Fit Deviation Fit Deviation Fit m m m m m m m m m m m m m Engineering A A122 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A123 A122 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A123 Non ferrous housings Care should be taken when pressing cups into aluminum or magnesium housings to avoid metal pick up This may result in unsatisfactory fits backing and alignment from debris trapped between the cup and backing shoulder Preferably the cup should be frozen or the housing heated or both during assembly Also a special lubricant may be used to ease assembly In some cases cups are mounted in steel inserts which are attached to the aluminum or magnesium housings Table fits may then be used Where the cup is fitted directly into an aluminum housing it is suggested that a minimum tight fit of 1 0 m per mm 0 0010 in per in of cup outside diameter be used For a magnesium housing a minimum tight fit of 1 5 m per mm 0 0015 in per in of cup outside diameter is suggested Hollow shafts In case of a thin section hollow shaft the fits mentioned in the tables for industrial applications should be increased to avoid possible cone creeping under some load conditions Heavy duty fitting practice Where heavy duty loads shock loads or high speeds are involved the heavy duty fitting practice should be used regardless of whether the cone seats are ground or unground Where it is impractical to grind the shaft O D for the cone seats the tighter heavy duty fitting practice should be followed In this case the turned shaft O D should not exceed a maximum surface finish of 3 2 m 125 in arithmetic average The average interference cone fit for inch bearings above 76 2 mm 3 in bore should be 0 5 m per mm 0 0005 in per in of bearing bore See inch fitting practice tables for cones with smaller bores The minimum fit should not be less than 25 m 0 0010 in tight If the shaft diameter is held to the same tolerance as the bearing bore use the average interference fit For example average interference fit between a 609 6 mm 24 in bore cone and shaft will be 305 m 0 0120 in The fit range will be 305 m 0 0120 in tight plus or minus the bearing bore tolerance See metric fitting practice tables for heavy duty metric cone fitting practice Double row assemblies with double cups Non rotating double outer races of types TDO and TNA bearings are generally mounted with loose fits to permit assembly and disassembly Fig A 24 The loose fit also permits axial floating when the bearing is mounted in conjunction with an axially fixed locating bearing on the other end of the shaft Double outer races types CD and DC can be pinned to prevent rotation in the housing Fitting values can be taken from general industrial guidelines Bearing assemblies SR TNA TNASW TNASWE types The tolerance and fits for bearing types SR TNA TNASW and TNASWE are tabulated along with the other dimensions in the bearing tables CAUTION Failure to use the specified fits may result in improper bearing setting Reduced bearing performance or malfunction may occur This may cause damage to machinery in which the bearing is a component If interference fits are either greater or less than those specified the mounted bearing setting will be other than intended Fixed bearing Floating bearing Fig A 24 Double row bearing arrangement assembled with loose fit fitting practices continued A122 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A123 Engineering A A122 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A123 These charts are guidelines for specifying shaft and housing fits related to particular operating conditions Shaft and Housing Fits Radial ball and cylindrical roller bearings Ball Bearings Operating Examples Cylindrical Roller Bearings For all nominal diameters Conditions Except 5200 Series Loads Shaft Loads Shaft Shaft Shaft Lower Upper Tolerance Lower Upper Diameter Tolerance Diameter Load Load Symbol Load Load mm Symbol 1 inch Limit Limit Limit Limit Inner Ring Stationary Inner ring to be 0 Ce 7 g6 easily displaced Wheels 0 C 6 All g6 All on shaft Non rotating shafts Inner ring does 0 Ce h6 not need to be Tension pulleys 0 C All h6 All easily displaced Inner Ring Rotating or Indeterminate over incl over incl Electrical apparatus 0 4 0 j6 8 0 1 57 Machine tools 40 14 0 k6 4 1 57 5 51 0 0 07 Ce j6 2 Light loads Pumps 0 0 08C 140 32 0 m6 5 5 51 12 60 Ventilators 320 5 00 n6 12 60 19 68 Industrial trucks 500 p6 19 68 Electrical motors 0 4 0 k5 0 1 57 Turbines 40 1 00 m5 1 57 3 94 0 07 Ce 0 15 Ce k5 Normal loads Pumps 0 08C 0 18C 100 14 0 m6 3 94 5 51 Combustion engines 140 32 0 n6 5 51 12 60 Gear transmissions 320 5 00 p6 12 60 19 68 etc 500 r6 19 68 0 4 0 m5 3 0 1 57 40 65 m6 3 1 57 2 56 0 15 Ce Ce m5 Heavy loads Rail vehicles 0 18C C 65 14 0 n6 3 2 56 5 51 Shock loads Traction motors 140 32 0 p6 3 5 51 12 60 320 5 00 r6 3 12 60 19 68 500 r7 3 19 68 Thrust Loads 0 Ce j6 3 Pure thrust loads All Not suggested consult your Timken representative 1 For solid shaft See pages A61 for numerical values 2 Use j5 for accurate applications 3 Bearings with greater than nominal clearance must be used Operating Conditions Examples Housing Outer Ring Tolerance Symbol 1 Displaceable Axially Outer Ring Rotating Crane support wheels Heavy loads with thin wall housing Wheel hubs roller bearings P6 No Crank bearings Normal to heavy loads Wheel hubs ball bearings N6 No Crank bearings Conveyor rollers Light loads Rope sheaves M6 No Tension pulleys Indeterminate Load Direction Heavy shock loads Electric traction motors M7 No Electric motors Normal to heavy loads axial displacement Pumps K6 No normally of outer ring not required Crankshaft main bearings Electric motors Light to normal loads axial displacement Pumps J6 Yes normally of outer ring desired Crankshaft main bearings Outer Ring Stationary Shock loads temporary complete unloading Heavy rail vehicles J6 Yes normally All General applications H6 loads One piece housing Heavy rail vehicles Easily Radially split housing Transmission drives H7 Easily Heat supplied through shaft Drier cylinders G7 Easily Below this line housing can either be one piece or split above this line a split housing is not suggested 1 Cast iron steel housing See pages A61 to A72 for numerical values Where wider tolerances are permissible P7 N7 M7 K7 J7 and H7 values may be used in place of P6 N6 M6 K6 J6 and H6 values respectively Housing Shaft fitting practices continued 4 Use k5 for accurate applications 5 Use m5 for accurate applications 6 C Dynamic Load Rating 7 Ce Extended Dynamic Load Rating Ball Bearings 8 Use j5 for accurate applications Engineering A A124 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A125 A124 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A125 RADIAL BALL BEARINGS ABEC 1 AND ABEC 3 BALL BEARINGS Shaft and housing fits The tables on the following pages show information supplemental to and coherent with that found on pages A125 through A139 as applied to ball bearings Actual shaft and housing diameters are listed for ABEC 1 ABEC 3 and angular contact 7000WN Series These suggestions can be used for most applications having light to normal loads Shaft and housing fits for wide inner ring ball bearings are found on page A133 ABEC 7 BALL BEARINGS Shaft fits As a general rule it is suggested that the shaft size and tolerance for seating ABEC 7 super precision bearings be the same as the bearing bore thus producing an average line to line fit For larger shaft sizes the average fit increases to a slight interference Example Bore Size Shaft Diameter Resultant Mounting Average Fit Inches Inches Fits Inches Max 2 1654 Min 2 1652 0002 tight Min 2 1652 Max 2 1654 0002 loose line to line Housing fits Under normal conditions of rotating shaft the outer ring is stationary and should be mounted with a hand push or light tapping fit Should the housing be the rotating member the same fundamental considerations apply in mounting the outer race as in the case of an inner ring mounted on a rotating shaft As a general rule the minimum housing bore dimensions for super precision bearings may be established as the same as the maximum bearing outside diameter If the bearing O D tolerance is 0003 inch the maximum housing bore should be established as 0003 inch larger than the minimum housing bore dimension Example Outside Diameter Housing Bore Resultant Mounting Average Fit Inches Inches Fits Inches Inches Max 3 5433 Min 3 5433 0000 tight Min 3 5430 Max 3 5436 0006 loose 0003 loose On high speed applications it is extremely important that the floating bearing or pair can move axially to compensate for thermal changes It cannot float laterally if restricted by a tight housing bore or by the radial expansion of the bearing itself Cases involving unusual conditions should be submitted to your Timken representative for suggestions It is equally important that all shaft and housing shoulders be absolutely square and that the faces of the spacers be square and parallel Selective assembly Under certain conditions it may be desirable to control fits more accurately without the added expense of using closer tolerance bearings and mating parts This can be accomplished by selective assembly of bearings shafts and housings after they have been sized and grouped according to bores and outside diameters Generally however it is more satisfactory for production and servicing to use closer shaft and housing tolerances with bearings having a higher degree of precision Bearings with coded bores and O D s are available on special order to facilitate this selective assembly process Shafts and housing fillets The suggested shaft and housing fillet radii listed in the dimension tables of the product catalogs should be used to assure proper seating of the bearings against shaft and housing shoulders The manufacturing tolerances on bearing corner radii are such that the corners will clear the cataloged fillet radii when the bearings are tightly seated against shoulders Shaft and housing radii and shoulders should be free from nicks and burrs Whenever possible undercutting of bearing seats and adjacent shoulders per figure below is advisable to help avoid tapered bearing seats and assure clearing corners fitting practices continued A124 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A125 Engineering A A124 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A125 Note These tables are to be used for applications where only one ring either inner or outer has an interference fit with its shaft and housing The guidelines for operating conditions covering these tables are found on page A123 In cases where interference fits are used for both rings bearings with a special internal clearance may be required Shaft diameter dimensions are for solid steel shafts Consult your Timken representa tive when using hollow shafts Shaft and Housing Fits Radial ball bearing Shaft fits ABEC 1 ABEC 3 1 Mean fit loose These sizes have plus bore tolerances SHAFT FITS ABEC 1 ABEC 3 Basic Bore Shaft Rotating Load Stationary or Shaft Stationary Load Stationary or Bearing Tolerance Shaft Stationary Load Rotating Shaft Rotating Load Rotating Number Typical Inner Ring Rotation Typical Outer Ring Rotation Shaft Diameter Mean Fit Tight Shaft diameter Mean Fit Loose Max Min Max Min ABEC 1 ABEC 3 Max Min ABEC 1 ABEC 3 mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in Extra Small 30 S F Flanged Series 33K3 F33K3 3 175 0 1250 3 167 0 1247 3 180 0 1252 3 175 0 1250 0 006 0 00025 0 005 0 00020 3 170 0 1248 3 162 0 1245 0 005 0 00020 0 006 0 00025 33K4 3 175 0 1250 3 167 0 1247 3 180 0 1252 3 175 0 1250 0 006 0 00025 0 005 0 00020 3 170 0 1248 3 162 0 1245 0 005 0 00020 0 006 0 00025 33K5 4 762 0 1875 3 754 0 1872 4 768 0 1877 4 762 0 1875 0 006 0 00025 0 005 0 00020 4 752 0 1873 4 750 0 1870 0 005 0 00020 0 006 0 00025 34K 4 000 0 1575 3 992 0 1572 4 006 0 1577 4 001 0 1575 0 006 0 00025 0 005 0 00020 3 995 0 1573 3 988 0 1570 0 005 0 00020 0 006 0 00025 35K 5 000 0 1969 4 992 0 1966 5 006 0 1971 5 001 0 1969 0 006 0 00025 0 005 0 00020 4 996 0 1967 4 989 0 1964 0 005 0 00020 0 006 0 00025 36K 6 000 0 2362 5 992 0 2359 6 005 0 2364 5 999 0 2362 0 006 0 00025 0 005 0 00020 5 994 0 2360 5 987 0 2357 0 005 0 00020 0 006 0 00025 37K 7 000 0 2756 6 992 0 2753 7 005 0 2758 6 998 0 2755 0 005 0 00020 0 004 0 00015 6 995 0 2754 6 985 0 2750 0 006 0 00025 0 008 0 00030 38K 38KV 8 000 0 3150 7 992 0 3147 8 006 0 3152 7 998 0 3149 0 005 0 00020 0 004 0 00015 7 996 0 3148 7 986 0 3144 0 006 0 00025 0 008 0 00030 39K 9 000 0 3543 8 992 0 3540 9 004 0 3545 8 997 0 3542 0 005 0 00020 0 004 0 00015 8 994 0 3541 8 984 0 3537 0 006 0 00025 0 008 0 00030 S1K S1K7 FS1K7 6 350 0 2500 6 342 0 2497 6 355 0 2502 6 347 0 2499 0 005 0 00020 0 004 0 00015 6 345 0 2498 6 335 0 2494 0 006 0 00025 0 008 0 00030 S3K FS3K 9 525 0 3750 9 517 0 3747 9 530 0 3752 9 522 0 3749 0 005 0 00020 0 004 0 00015 9 520 0 3748 9 510 0 3744 0 006 0 00025 0 008 0 00030 S5K 12 700 0 5000 12 692 0 4997 12 705 0 5002 12 697 0 4999 0 005 0 00020 0 004 0 00015 12 695 0 4998 12 682 0 4993 0 008 0 00030 0 009 0 00035 S7K 15 875 0 6250 15 867 0 6247 15 880 0 6252 15 872 0 6249 0 005 0 00020 0 004 0 00015 15 870 0 6248 15 857 0 6243 0 008 0 00030 0 009 0 00035 S8K 19 050 0 7500 19 040 0 7496 19 060 0 7504 19 053 0 7501 0 011 0 00045 0 009 0 00035 19 042 0 7497 19 030 0 7492 0 009 0 00035 0 011 0 00045 S9K 22 225 0 8750 22 215 0 8746 22 235 0 8754 22 228 0 8751 0 011 0 00045 0 009 0 00035 22 217 0 8747 22 205 0 8742 0 009 0 00035 0 011 0 00045 S10K 25 400 1 0000 25 390 0 9996 25 410 1 0004 25 403 1 0001 0 011 0 00045 0 009 0 00035 25 392 0 9997 25 380 0 9992 0 009 0 00035 0 011 0 00045 S11K 28 575 1 1250 28 565 1 1246 28 585 1 1254 28 578 1 1251 0 011 0 00045 0 009 0 00035 28 567 1 1247 28 555 1 1242 0 009 0 00035 0 011 0 00045 S12K 31 750 1 2500 31 737 1 2495 31 763 1 2505 31 753 1 2501 0 014 0 00055 0 011 0 00045 31 740 1 2496 31 725 1 2490 0 011 0 00045 0 014 0 00055 F2DD 2 3 183 0 1253 3 175 0 1250 3 175 0 1250 3 167 0 1247 0 008 1 0 00030 0 006 1 0 00025 3 175 0 1250 3 167 0 1247 0 008 0 00030 0 006 0 00025 F2 4 770 0 1878 4 762 0 1875 4 762 0 1875 4 755 0 1872 0 008 1 0 00030 0 006 1 0 00025 4 762 0 1875 4 755 0 1872 0 008 0 00030 0 006 0 00025 F3 4 770 0 1878 4 762 0 1875 4 762 0 1875 4 755 0 1872 0 008 1 0 00030 0 006 1 0 00025 4 762 0 1875 4 755 0 1872 0 008 0 00030 0 006 0 00025 F4 6 358 0 2503 6 350 0 2500 6 350 0 2500 6 342 0 2497 0 008 1 0 00030 0 006 1 0 00025 6 350 0 2500 6 342 0 2497 0 008 0 00030 0 006 0 00025 F5 7 946 0 3128 7 938 0 3125 7 938 0 3125 7 930 0 3122 0 008 1 0 00030 0 006 1 0 00025 7 938 0 3125 7 930 0 3122 0 008 0 00030 0 006 0 00025 fitting practices continued These diameters result in shaft to bearing bore fit which closely conforms to k5 listed on pages A66 and A72 These diameters result in shaft to bearing bore fit which closely conforms to g6 listed on pages A66 and A72 Engineering A A126 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A127 A126 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A127 Note These tables are to be used for applications where only one ring either inner or outer has an interference fit with its shaft and housing The guidelines for operating conditions covering these tables are found on page A123 In cases where interference fits are used for both rings bearings with a special internal clearance may be required Shaft diameter dimensions are for solid steel shafts Consult your Timken representative when using hollow shafts Shaft and Housing Fits Radial ball bearing Shaft fits ABEC 1 ABEC 3 SHAFT FITS ABEC 1 ABEC 3 Basic Bore Shaft Rotating Load Stationary or Shaft Stationary Load Stationary or Bearing Number Tolerance Shaft Stationary Load Rotating Shaft Rotating Load Rotating Shaft Diameter Mean Fit Tight Shaft Diameter Mean Fit Loose Max Min Max Min ABEC 1 ABEC 3 Max Min ABEC 1 ABEC 3 mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in 9100 9300 200 300 400 5200 5300 SERIES 00 10 0 3937 9 992 0 3934 10 005 0 3939 9 997 0 3936 0 005 0 0002 0 004 0 00015 9 995 0 3935 9 985 0 3931 0 006 0 00025 0 008 0 00030 01 12 0 4724 11 992 0 4721 12 004 0 4726 11 996 0 4723 0 005 0 0002 0 004 0 00015 11 994 0 4722 11 981 0 4717 0 008 0 00030 0 009 0 00035 02 15 0 5906 14 992 0 5903 15 006 0 5908 14 999 0 5905 0 005 0 0002 0 004 0 00015 14 996 0 5904 14 983 0 5899 0 008 0 00030 0 009 0 00035 03 17 0 6693 16 992 0 6690 17 005 0 6695 16 998 0 6692 0 005 0 0002 0 004 0 00015 16 995 0 6691 16 982 0 6686 0 008 0 00030 0 009 0 00035 04 20 0 7874 19 990 0 7870 20 010 0 7879 20 002 0 7875 0 013 0 0005 0 009 0 00035 19 992 0 7871 19 980 0 7866 0 009 0 00035 0 011 0 00045 05 25 0 9843 24 990 0 9839 25 014 0 9848 25 004 0 9844 0 013 0 0005 0 009 0 00035 24 994 0 9840 24 981 0 9835 0 009 0 00035 0 011 0 00045 06 30 1 1811 29 990 1 1807 30 010 1 1816 30 002 1 1812 0 013 0 0005 0 009 0 00035 29 992 1 1808 29 980 1 1803 0 009 0 00035 0 011 0 00045 07 35 1 3780 34 987 1 3775 35 014 1 3785 35 004 1 3781 0 014 0 0006 0 011 0 00045 34 991 1 3776 34 976 1 3770 0 011 0 00045 0 014 0 00055 08 40 1 5748 39 987 1 5743 40 013 1 5753 40 002 1 5749 0 014 0 0006 0 011 0 00045 39 990 1 5744 39 975 1 5738 0 011 0 00045 0 014 0 00055 09 45 1 7717 44 987 1 7712 45 014 1 7722 45 004 1 7718 0 014 0 0006 0 011 0 00045 44 991 1 7713 44 976 1 7707 0 011 0 00045 0 014 0 00055 10 50 1 9685 49 987 1 9680 50 013 1 9690 50 002 1 9686 0 014 0 0006 0 011 0 00045 49 990 1 9681 49 974 1 9675 0 011 0 00045 0 014 0 00055 11 55 2 1654 54 985 2 1648 55 016 2 1660 55 004 2 1655 0 017 0 0007 0 014 0 00055 54 991 2 1650 54 973 2 1643 0 011 0 00045 0 014 0 00055 12 60 2 3622 59 985 2 3616 60 015 2 3628 60 002 2 3623 0 017 0 0007 0 014 0 00055 59 990 2 3618 59 972 2 3611 0 011 0 00045 0 014 0 00055 13 65 2 5591 64 985 2 5585 65 016 2 5597 65 004 2 5592 0 017 0 0007 0 014 0 00055 64 991 2 5587 64 973 2 5580 0 011 0 00045 0 014 0 00055 14 70 2 7559 69 985 2 7553 70 015 2 7565 70 002 2 7560 0 017 0 0007 0 014 0 00055 69 990 2 7555 69 972 2 7548 0 011 0 00045 0 014 0 00055 15 75 2 9528 74 985 2 9552 75 016 2 9534 75 004 2 9529 0 017 0 0007 0 014 0 00055 74 991 2 9524 74 973 2 9517 0 011 0 00045 0 014 0 00055 16 80 3 1496 79 985 3 1490 80 015 3 1502 80 002 3 1497 0 017 0 0007 0 014 0 00055 79 990 3 1492 79 972 3 1485 0 011 0 00045 0 014 0 00055 17 85 3 3465 84 980 3 3457 85 019 3 3472 85 004 3 3466 0 020 0 0008 0 017 0 00065 84 988 3 3460 84 968 3 3452 0 013 0 00050 0 017 0 00065 18 90 3 5433 89 980 3 5425 90 018 3 5440 90 002 3 5434 0 020 0 0008 0 017 0 00065 89 987 3 5428 89 967 3 5420 0 013 0 00050 0 017 0 00065 19 95 3 7402 94 980 3 7394 95 019 3 7409 95 004 3 7403 0 020 0 0008 0 017 0 00065 94 988 3 7397 94 968 3 7389 0 013 0 00050 0 017 0 00065 20 100 3 9370 99 980 3 9362 100 018 3 9377 100 002 3 9371 0 020 0 0008 0 017 0 00065 99 987 3 9365 99 967 3 9357 0 013 0 00050 0 017 0 00065 21 105 4 1339 104 980 4 1331 105 019 4 1346 105 004 4 1340 0 020 0 0008 0 017 0 00065 104 988 4 1334 104 968 4 1326 0 013 0 00050 0 017 0 00065 22 110 4 3307 109 980 4 3299 110 018 4 3314 110 002 4 3308 0 020 0 0008 0 017 0 00065 109 987 4 3302 109 967 4 3294 0 013 0 00050 0 017 0 00065 EXTRA LARGE SERIES 124 224 324 120 4 7244 119 980 4 7236 120 018 4 7251 120 002 4 7245 0 020 0 0008 0 017 0 00065 119 987 4 7239 119 967 4 7231 0 013 0 00050 0 017 0 00065 126 226 326 130 5 1181 129 975 5 1171 130 020 5 1189 130 002 5 1182 0 024 0 0010 0 019 0 00075 129 984 5 1175 129 962 5 1166 0 014 0 00055 0 019 0 00075 128 228 328 140 5 5118 139 975 5 5108 140 020 5 5126 140 002 5 5119 0 024 0 0010 0 019 0 00075 139 984 5 5112 139 962 5 5103 0 014 0 00055 0 019 0 00075 9130 130 230 330 150 5 9055 149 975 5 9045 150 020 5 9063 150 002 5 9056 0 024 0 0010 0 019 0 00075 149 984 5 9049 149 962 5 9040 0 014 0 00055 0 019 0 00075 9132 132 232 160 6 2992 159 975 6 2982 160 020 6 3000 160 002 6 2993 0 024 0 0010 0 019 0 00075 159 984 6 2986 159 962 6 2977 0 014 0 00055 0 019 0 00075 9134 134 234 170 6 6929 169 975 6 6919 170 020 6 6937 170 002 6 6930 0 024 0 0010 0 019 0 00075 169 984 6 6923 169 962 6 6914 0 014 0 00055 0 019 0 00075 9136 136 236 336 180 7 0866 179 975 7 0856 180 020 7 0874 180 002 7 0867 0 024 0 0010 0 019 0 00075 179 984 7 0860 179 962 7 0851 0 014 0 00055 0 019 0 00075 9138 138 238 338 190 7 4803 189 970 7 4791 190 025 7 4813 190 005 7 4805 0 030 0 0012 0 024 0 00095 189 984 7 4797 189 956 7 4786 0 014 0 00055 0 020 0 00080 9140 240 340 200 7 8740 199 969 7 8728 200 025 7 8750 200 005 7 8742 0 030 0 0012 199 984 7 8734 199 954 7 8722 0 015 0 00060 9142 242 342 210 8 2677 212 509 8 2665 209 771 8 2587 210 002 8 2678 0 030 0 0012 209 987 8 2672 209 951 8 2658 0 015 0 00060 9144 244 344 220 8 6614 219 969 8 6602 220 025 8 6624 220 005 8 6616 0 030 0 0012 219 984 8 6608 219 954 8 6596 0 015 0 00060 9146 246 230 9 0551 229 969 9 0539 230 025 9 0561 230 005 9 0553 0 030 0 0012 230 022 9 0545 229 951 9 0533 0 015 0 00060 248 348 240 9 4488 239 969 9 4476 240 025 9 4498 240 005 9 4490 0 030 0 0012 239 984 9 4482 239 954 9 4470 0 015 0 00060 250 250 9 8425 249 964 9 8411 250 020 9 8434 250 005 9 8426 0 030 0 0012 250 022 9 8418 249 972 9 8406 0 015 0 00060 9152 252 352 260 10 2362 259 964 10 2348 260 027 10 2373 260 005 10 2364 0 036 0 0014 259 982 10 2355 259 951 10 2343 0 015 0 00060 9156 256 356 280 11 0236 279 964 11 0222 280 027 11 0247 280 005 11 0238 0 036 0 0014 279 982 11 0229 279 951 11 0217 0 015 0 00060 9160 260 300 11 8110 299 964 11 8096 300 027 11 8121 300 005 11 8112 0 036 0 0014 299 982 11 8103 299 951 11 8091 0 015 0 00060 9164 264 320 12 5984 319 964 12 5970 320 030 12 5996 320 005 12 5986 0 038 0 0015 319 982 12 5977 319 946 12 5963 0 015 0 00060 9180 400 15 7480 399 969 15 7464 400 030 15 7492 400 005 15 7482 0 038 0 0015 399 982 15 7473 399 946 15 7459 0 015 0 00060 These diameters result in shaft to bearing bore fit which closely conforms to k5 listed on pages A66 and A72 These diameters result in shaft to bearing bore fit which closely conforms to g6 listed on pages A66 and A72 fitting practices continued A126 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A127 Engineering A A126 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A127 Note These tables are to be used for applications where only one ring either inner or outer has an interference fit with its shaft and housing The guidelines for operating conditions covering these tables are found on page A123 In cases where interference fits are used for both rings bearings with a special internal clearance may be required Shaft diameter dimensions are for solid steel shafts Consult your Timken representative when using hollow shafts Shaft fits 7000WN SHAFT FITS 7000WN Single Row Angular Contact Bearings Bearing Bore Bearing Bore Shaft Rotating Load Stationary Mean Tight Number Diameter Shaft Diameter Fit Max Min Min Max mm in mm in mm in mm in mm in 00 10 0 3937 9 992 0 3934 9 997 0 3936 10 005 0 3939 0 005 0 0002 01 12 0 4724 11 991 0 4721 11 996 0 4723 12 004 0 4726 0 005 0 0002 02 15 0 5906 14 994 0 5903 14 999 0 5905 15 006 0 5908 0 005 0 0002 03 17 0 6693 16 993 0 6690 16 998 0 6692 17 005 0 6695 0 005 0 0002 04 20 0 7874 19 992 0 7871 19 997 0 7873 20 005 0 7876 0 005 0 0002 05 25 0 9843 24 994 0 9840 24 999 0 9842 25 006 0 9845 0 005 0 0002 06 30 1 1811 29 992 1 1808 29 997 1 1810 30 005 1 1813 0 005 0 0002 07 35 1 3780 34 994 1 3777 34 999 1 3779 35 009 1 3783 0 006 0 00025 08 40 1 5748 39 992 1 5745 39 997 1 5747 40 008 1 5751 0 006 0 00025 09 45 1 7717 44 994 1 7714 44 999 1 7716 45 009 1 7720 0 006 0 00025 10 50 1 9685 49 992 1 9682 49 997 1 9684 50 008 1 9688 0 006 0 00025 11 55 2 1654 54 991 2 1650 54 999 2 1653 55 011 2 1658 0 009 0 00035 12 60 2 3622 59 990 2 3618 59 997 2 3621 60 010 2 3626 0 009 0 00035 13 65 2 5591 64 991 2 5587 64 999 2 5590 65 011 2 5595 0 009 0 00035 14 70 2 7559 69 990 2 7555 69 997 2 7558 70 010 2 7563 0 009 0 00035 15 75 2 9528 74 991 2 9524 74 999 2 9527 75 011 2 9532 0 009 0 00035 16 80 3 1496 79 990 3 1492 79 997 3 1495 80 010 3 1500 0 009 0 00035 17 85 3 3465 84 988 3 3460 84 999 3 3464 85 014 3 3470 0 011 0 00045 18 90 3 5433 89 987 3 5428 89 997 3 5432 90 013 3 5438 0 011 0 00045 19 95 3 7402 94 988 3 7397 94 999 3 7401 95 014 3 7407 0 011 0 00045 20 100 3 9370 99 987 3 9365 99 997 3 9369 100 013 3 9375 0 011 0 00045 21 105 4 1339 104 988 4 1334 104 999 4 1338 105 014 4 1344 0 011 0 00045 22 110 4 3307 109 987 4 3302 109 997 4 3306 110 012 4 3312 0 011 0 00045 24 120 4 7244 119 987 4 7239 119 997 4 7243 120 012 4 7249 0 011 0 00045 26 130 5 1181 129 982 5 1174 129 997 5 1180 130 015 5 1187 0 015 0 0006 28 140 5 5118 139 982 5 5111 139 997 5 5117 140 015 5 5124 0 015 0 0006 30 150 5 9055 149 982 5 9048 149 997 5 9054 150 015 5 9061 0 015 0 0006 These diameters result in shaft to bearing bore fit which closely conforms to j5 listed on pages A67 and A72 fitting practices continued Engineering A A128 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A129 A128 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A129 Note These tables are to be used for applications where only one ring either inner or outer has an interference fit with its shaft and housing The guidelines for operating conditions covering these tables are found on page A123 In cases where interference fits are used for both rings bearings with a special internal clearance may be required Housing bore diameter dimensions are for steel materials Consult your Timken representative when using other housing materials Housing Fits Radial ball bearing Housing fits ABEC 1 ABEC 3 Housing Fits ABEC 1 abec 3 Basic Bearing Number Housing Stationary Load Stationary or Housing Rotating Load Stationary or Housing Rotating Load Rotating Housing Stationary Load Rotating Extra Extra Housing Bore Mean Fit Loose Housing Bore Mean Fit Tight Small Light Light Medium Heavy Min Max ABEC 1 ABEC 3 Min Max ABEC 1 ABEC 3 mm in mm in mm in mm in mm in mm in mm in mm in 30 S F 9100 9300 200 300 400 2 5200 7200 5300 7300 7400 SERIES SERIES SERIES SERIES SERIES 33K3 F33K3 9 525 0 3750 9 535 0 3754 0 010 0 00040 0 009 0 00035 9 507 0 3743 9 525 0 3750 0 004 0 00015 0 005 0 00020 33K4 12 700 0 5000 12 710 0 5004 0 010 0 00040 0 009 0 00035 12 682 0 4993 12 700 0 5000 0 004 0 00015 0 005 0 00020 33K5 F33K5 12 700 0 5000 12 710 0 5004 0 010 0 00040 0 009 0 00035 12 682 0 4993 12 700 0 5000 0 004 0 00015 0 005 0 00020 34K 15 999 0 6299 16 010 0 6303 0 010 0 00040 0 009 0 00035 15 982 0 6292 15 999 0 6299 0 004 0 00015 0 005 0 00020 35K 18 999 0 7480 19 012 0 7485 0 011 0 00045 0 010 0 00040 18 979 0 7472 18 999 0 7480 0 005 0 00020 0 006 0 00025 36K 18 999 0 7480 19 012 0 7485 0 011 0 00045 0 010 0 00040 18 979 0 7472 18 999 0 7480 0 005 0 00020 0 006 0 00025 37K 21 999 0 8661 22 012 0 8666 0 011 0 00045 0 010 0 00040 21 979 0 8653 29 999 0 8661 0 005 0 00020 0 006 0 00025 38K 21 999 0 8661 22 012 0 8666 0 011 0 00045 0 010 0 00040 21 979 0 8653 21 999 0 8661 0 005 0 00020 0 006 0 00025 38KV 24 000 0 9449 24 013 0 9454 0 011 0 00045 0 010 0 00040 23 980 0 9441 24 000 0 9449 0 005 0 00020 0 006 0 00025 39K 9100 25 999 1 0236 26 012 1 0241 0 011 0 00045 0 010 0 00040 25 979 1 0228 25 999 1 0236 0 005 0 00020 0 006 0 00025 S1K7 FS1K7 15 875 0 6250 15 885 0 6254 0 010 0 00040 0 009 0 00035 15 857 0 6243 15 875 0 6250 0 004 0 00015 0 005 0 00020 S1K 19 050 0 7500 19 063 0 7505 0 011 0 00045 0 010 0 00040 19 030 0 7492 19 050 0 7500 0 005 0 00020 0 006 0 00025 S3K FS3K 22 225 0 8750 22 238 0 8755 0 011 0 00045 0 010 0 00040 22 205 0 8742 22 225 0 8750 0 005 0 00020 0 006 0 00025 S5K 28 575 1 1250 28 588 1 1255 0 011 0 00045 0 010 0 00040 28 555 1 1242 28 575 1 1250 0 005 0 00020 0 006 0 00025 S7K 34 925 1 3750 34 940 1 3756 0 014 0 00055 0 011 0 00045 34 900 1 3740 34 925 1 3750 0 006 0 00025 0 009 0 00035 S8K 41 275 1 6250 41 290 1 6256 0 014 0 00055 0 011 0 00045 41 250 1 6240 41 275 1 6250 0 006 0 00025 0 009 0 00035 S9K 47 625 1 8750 47 640 1 8756 0 014 0 00055 0 011 0 00045 47 600 1 8740 47 625 1 8750 0 006 0 00025 0 009 0 00035 S10K 50 800 2 0000 50 818 2 0007 0 015 0 00060 0 014 0 00055 50 770 1 9988 50 800 2 0000 0 009 0 00035 0 010 0 00040 S11K 53 975 2 1250 53 993 2 1257 0 015 0 00060 0 014 0 00055 53 945 2 1238 53 975 2 1250 0 009 0 00035 0 010 0 00040 S12K 57 150 2 2500 57 168 2 2507 0 015 0 00060 0 014 0 00055 57 120 2 2488 57 150 2 2500 0 009 0 00035 0 010 0 00040 F2002 9 525 0 3750 9 533 0 3753 0 000 0 00000 0 000 0 00000 9 522 0 3749 9 533 0 3753 0 000 0 00000 0 000 0 00000 F2 11 112 0 4375 11 120 0 4378 0 000 0 00000 0 000 0 00000 11 110 0 4374 11 120 0 4378 0 000 0 00000 0 000 0 00000 F3 14 285 0 5624 14 295 0 5628 0 000 0 00000 0 000 0 00000 14 285 0 5624 14 295 0 5628 0 000 0 00000 0 000 0 00000 F4 15 872 0 6249 15 883 0 6253 0 000 0 00000 0 000 0 00000 15 872 0 6249 15 883 0 6253 0 000 0 00000 0 000 0 00000 F5 17 460 0 6874 17 470 0 6878 0 000 0 00000 0 000 0 00000 17 460 0 6874 17 476 0 6878 0 000 0 00000 0 000 0 00000 9101 9302 28 001 1 1024 28 014 1 1029 0 011 0 00045 0 000 0 00040 27 981 1 1016 28 001 1 1024 0 005 0 00020 0 006 0 00025 9303 200 30 000 1 1811 30 013 1 1816 0 011 0 00045 0 010 0 00040 29 980 1 1803 39 000 1 1811 0 005 0 00020 0 006 0 00025 9102 201 31 999 1 2598 32 014 1 2604 0 014 0 00055 0 011 0 00045 31 974 1 2588 31 999 1 2598 0 006 0 00025 0 009 0 00035 9103 202 300 35 001 1 3780 35 016 1 3786 0 014 0 00055 0 011 0 00045 34 976 1 3770 35 001 1 3780 0 006 0 00025 0 009 0 00035 9304 301 37 000 1 4567 37 015 1 4573 0 014 0 00055 0 011 0 00045 36 975 1 4557 37 000 1 4567 0 006 0 00025 0 009 0 00035 203 40 000 1 5748 40 015 1 5754 0 014 0 00055 0 011 0 00045 39 975 1 5738 40 000 1 5748 0 006 0 00025 0 009 0 00035 9104 9305 302 41 999 1 6535 42 014 1 6541 0 014 0 00055 0 011 0 00045 41 974 1 6525 41 999 1 6535 0 006 0 00025 0 009 0 00035 9105 9306 204 303 47 000 1 8504 47 015 1 8510 0 014 0 00055 0 011 0 00045 46 975 1 8494 47 000 1 8504 0 006 0 00025 0 009 0 00035 205 304 51 999 2 0472 52 017 2 0479 0 015 0 00060 0 014 0 00055 51 968 2 0460 51 999 2 0472 0 009 0 00035 0 010 0 00040 9106 9307 55 001 2 1654 55 019 2 1661 0 015 0 00060 0 014 0 00055 54 971 2 1642 55 001 2 1654 0 009 0 00035 0 010 0 00040 9107 9308 206 305 403 61 999 2 4409 62 017 2 4416 0 015 0 00060 0 014 0 00055 61 968 2 4397 61 999 2 4409 0 009 0 00030 0 010 0 00040 9108 68 001 2 6772 68 019 2 6779 0 015 0 00060 0 014 0 00055 67 970 2 6760 68 001 2 6772 0 009 0 00030 0 010 0 00040 9310 207 306 404 71 999 2 8346 72 017 2 8353 0 015 0 00060 0 014 0 00055 71 968 2 8334 71 999 2 8346 0 009 0 00030 0 010 0 00040 9109 75 001 2 9528 75 019 2 9535 0 015 0 00060 0 014 0 00055 74 971 2 9516 75 001 2 9528 0 009 0 00030 0 010 0 00040 9110 208 307 405 80 000 3 1496 80 018 3 1503 0 015 0 00060 0 014 0 00055 79 969 3 1484 80 000 3 1496 0 009 0 00030 0 010 0 00040 9312 209 85 001 3 3465 85 024 3 3474 0 019 0 00080 0 017 0 00065 84 966 3 3451 85 001 3 3465 0 010 0 00040 0 013 0 00050 9111 210 308 406 90 000 3 5433 90 023 3 5442 0 019 0 00080 0 017 0 00065 89 964 3 5419 90 000 3 5433 0 010 0 00040 0 013 0 00050 9112 95 001 3 7402 120 424 3 7411 0 019 0 00080 0 017 0 00065 94 965 3 7388 95 001 3 7402 0 010 0 00040 0 013 0 00050 9113 211 309 407 100 000 3 9370 100 023 3 9379 0 019 0 00080 0 017 0 00065 99 964 3 9356 100 000 3 9370 0 010 0 00040 0 013 0 00050 9114 212 310 408 110 000 4 3307 110 023 4 3316 0 019 0 00080 0 017 0 00065 109 964 4 3293 110 000 4 3307 0 010 0 00040 0 013 0 00050 2 400 Series are specials consult your Timken representative These diameters result in a bearing O D to housing bore fit which closely conforms to H6 listed on pages A66 and A72 These diameters result in a bearing O D to housing bore fit which closely conforms to M7 listed on pages A66 and A72 fitting practices continued A128 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A129 Engineering A A128 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A129 Note These tables are to be used for applications where only one ring either inner or outer has an interference fit with its shaft and housing The guidelines for operating conditions covering these tables are found on page A123 In cases where interference fits are used for both rings bearings with a special internal clearance may be required Housing bore diameter dimensions are for steel materials Consult your Timken representative when using other housing materials Housing fits ABEC 1 ABEC 3 Housing Fits ABEC 1 abec 3 Basic Bearing Number Housing Stationary Load Stationary or Housing Rotating Load Stationary or Housing Rotating Load Rotating Housing Stationary Load Rotating Extra Extra Housing Bore Mean Fit Loose Housing Bore Mean Fit Tight Small Light Light Medium Heavy Min Max ABEC 1 ABEC 3 Min Max ABEC 1 ABEC 3 mm in mm in mm in mm in mm in mm in mm in mm in 30 S F 9100 200 5200 300 5300 400 5400 9300 7200 7300 7400 SERIES SERIES SERIES SERIES SERIES 9115 115 001 4 5276 115 024 4 5285 0 019 0 0008 0 017 0 00065 114 965 4 5262 115 001 4 5276 0 010 0 0004 0 013 0 00050 213 311 409 120 000 4 7244 120 023 4 7253 0 019 0 0008 0 017 0 00065 119 964 4 7230 120 000 4 7244 0 010 0 0004 0 013 0 00050 214 125 001 4 9213 125 026 4 9223 0 023 0 0009 0 019 0 00075 124 960 4 9197 125 001 4 9213 0 010 0 0004 0 014 0 00055 9117 215 312 410 130 000 5 1181 130 025 5 1191 0 023 0 0009 0 019 0 00075 129 959 5 1165 130 000 5 1181 0 010 0 0004 0 014 0 00055 9118 216 313 411 140 000 5 5118 140 025 5 5128 0 023 0 0009 0 019 0 00075 139 959 5 5102 140 000 5 5118 0 010 0 0004 0 014 0 00055 9120 217 314 412 150 000 5 9055 150 025 5 9065 0 023 0 0009 0 019 0 00075 149 959 5 9039 150 000 5 9055 0 010 0 0004 0 014 0 00055 120 2 218 315 160 000 6 2992 160 025 6 3002 0 025 0 0010 0 020 0 00080 159 959 6 2976 160 000 6 2992 0 008 0 0003 0 013 0 00050 9121 413 160 000 6 2992 160 025 6 3002 0 025 0 0010 0 020 0 00080 159 959 6 2976 160 000 6 2992 0 008 0 0003 0 013 0 00050 9122 129 316 170 000 6 6929 170 025 6 6939 0 025 0 0010 0 020 0 00080 169 959 6 6913 170 000 6 6929 0 008 0 0003 0 013 0 00050 122 175 000 6 8898 175 026 6 8908 0 025 0 0010 0 020 0 00080 174 960 6 8882 175 001 6 8898 0 008 0 0003 0 013 0 00050 9124 220 317 414 180 000 7 0866 180 025 7 0876 0 025 0 0010 0 020 0 00080 179 959 7 0850 180 000 7 0866 0 008 0 0003 0 013 0 00050 124 221 318 415 190 000 7 4803 190 028 7 4815 0 029 0 0012 0 023 0 00090 189 954 7 4785 190 000 7 4803 0 008 0 0003 0 014 0 00055 9126 222 319 416 200 000 7 8740 200 028 7 8752 0 029 0 0012 0 023 0 00090 199 954 7 8722 200 000 7 8740 0 008 0 0003 0 014 0 00055 126 205 001 8 0709 205 029 8 0721 0 029 0 0012 0 023 0 00090 204 955 8 0691 205 001 8 0709 0 008 0 0003 0 014 0 00055 9128 210 000 8 2677 210 028 8 2689 0 029 0 0012 0 023 0 00090 209 954 8 2659 210 000 8 2677 0 008 0 0003 0 014 0 00055 224 320 215 001 8 4646 215 029 8 4658 0 029 0 0012 0 023 0 00090 214 955 8 4628 215 001 8 4646 0 008 0 0003 0 014 0 00055 128 220 000 8 6614 220 028 8 6626 0 029 0 0012 0 023 0 00090 219 954 8 6596 220 000 8 6614 0 008 0 0003 0 014 0 00055 9130 321 418 225 001 8 8583 225 029 8 8595 0 029 0 0012 0 023 0 00090 224 955 8 8565 225 001 8 8583 0 008 0 0003 0 014 0 00055 226 230 000 9 0551 230 027 9 0563 0 029 0 0012 0 023 0 00090 229 954 9 0533 230 000 9 0551 0 008 0 0003 0 014 0 00055 130 235 001 9 2520 235 029 9 2532 0 029 0 0012 0 023 0 00090 234 955 9 2502 235 001 9 2520 0 008 0 0003 0 014 0 00055 9132 322 240 000 9 4488 240 027 9 4506 0 029 0 0012 0 023 0 00090 239 954 9 4470 240 000 9 4488 0 008 0 0003 0 014 0 00055 132 228 250 000 9 8425 250 027 9 8437 0 029 0 0012 0 023 0 00090 249 954 9 8407 250 000 9 8425 0 008 0 0003 0 014 0 00055 9134 324 259 999 10 2362 260 032 10 2374 0 033 0 0013 0 027 0 00105 259 942 10 2342 259 999 10 2362 0 008 0 0003 0 015 0 00060 134 420 265 001 10 4331 265 034 10 4343 0 033 0 0013 0 027 0 00105 264 950 10 4311 265 001 10 4331 0 008 0 0003 0 015 0 00060 230 269 999 10 6299 270 032 10 6311 0 033 0 0013 0 027 0 00105 269 949 10 6279 269 999 10 6299 0 008 0 0003 0 015 0 00060 136 9136 326 279 999 11 0236 280 032 11 0248 0 033 0 0013 0 027 0 00105 279 949 11 0216 279 999 11 0236 0 008 0 0003 0 015 0 00060 9138 232 289 999 11 4173 290 039 11 4185 0 033 0 0013 0 027 0 00105 289 949 11 4153 289 999 11 4173 0 008 0 0003 0 015 0 00060 138 328 299 999 11 8110 300 032 11 8122 0 033 0 0013 0 027 0 00105 299 949 11 8090 299 999 11 8110 0 008 0 0003 0 015 0 00060 9140 234 309 999 12 2047 310 029 12 2059 0 033 0 0013 309 949 12 2027 309 999 12 2047 0 008 0 0003 236 330 319 999 12 5984 320 035 12 5998 0 038 0 0015 319 943 12 5962 319 999 12 5984 0 008 0 0003 9144 238 339 999 13 3858 340 035 13 3872 0 038 0 0015 339 943 13 3836 339 999 13 3858 0 008 0 0003 9146 240 359 999 14 1732 360 035 14 1746 0 038 0 0015 359 943 14 1710 359 999 14 1732 0 008 0 0003 242 336 380 007 14 9606 380 035 14 9620 0 038 0 0015 379 943 14 9584 379 999 14 9606 0 008 0 0003 9152 244 338 399 999 15 7480 400 035 15 7494 0 038 0 0015 399 943 15 7458 399 999 15 7480 0 008 0 0003 9156 246 340 419 999 16 5354 420 040 16 5370 0 038 0 0017 419 936 16 5329 419 999 16 5354 0 010 0 0004 248 342 439 999 17 3228 440 040 17 3244 0 038 0 0017 439 936 17 3203 439 999 17 3228 0 010 0 0004 9160 250 344 459 999 18 1102 460 040 18 1118 0 038 0 0017 459 936 18 1077 459 999 18 1102 0 010 0 0004 9164 252 479 999 18 8976 480 040 18 8992 0 038 0 0017 479 936 18 8951 479 999 18 8976 0 010 0 0004 256 348 499 999 19 6850 500 040 19 6866 0 038 0 0017 499 936 19 6825 499 999 19 6850 0 010 0 0004 260 352 539 999 21 2598 540 042 21 2615 0 048 0 0019 539 930 21 2571 539 999 21 2598 0 010 0 0004 264 356 579 999 22 8346 580 042 22 8363 0 048 0 0019 579 930 22 8319 579 999 22 8346 0 010 0 0004 9180 599 999 23 6220 600 042 23 6237 0 048 0 0019 599 930 23 6193 599 999 23 6220 0 010 0 0004 These diameters result in a bearing O D to housing bore fit which closely conforms to H6 beginning on A61 These diameters result in a bearing O D to housing bore fit which closely conforms to M7 listed on page A63 fitting practices continued Engineering A A130 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A131 A130 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A131 Shaft and Housing shoulders Shaft and housing shoulder diameters for radial roller and thrust ball and roller bearings are also found in the respective dimension tables Shaft and housing shoulders for ball bearings are shown below Radial ball bearings The preferred method of locating bearings on shafts and in housings is to provide accurate shoulders perpendicular to the shaft axis Shoulders should be large enough to exceed the theoretical point of tangency between the corner radius and the face of the bearing and small enough to permit bearing removal with proper pullers These tables give the suggested maximum and minimum shaft and housing shoulder diameters for the majority of applications Where design limitations do not permit conformance to these suggested diameters your Timken representative should be consulted Suggested shaft and housing fillet radii are listed in the dimensional tables of each product catalog and must be used to assure proper seating against shaft and housing shoulders Shaft and housing diameters for radial ball bearings are shown below and on the following two pages For radial cylindrical spherical and tapered roller bearings refer to the respective dimension tables Housing shoulders for wide inner ring bearings are shown on page A133 Extra Light 9300 Series Basic Shaft Housing Bearing Shoulder Shoulder Number 0 25 mm 010 0 25 mm 010 mm in mm in 9301K 14 7 0 58 21 6 0 85 9302K 17 8 0 70 25 4 1 00 9303K 19 8 0 78 27 4 1 08 9304K 23 9 0 94 33 5 1 32 9305K 29 0 1 14 38 6 1 52 9306K 33 5 1 32 43 4 1 71 9307K 39 6 1 56 50 8 2 00 9308K 45 0 1 77 57 4 2 26 9309K 50 3 1 98 63 2 2 49 9310K 54 9 2 16 67 6 2 66 9311K 61 0 2 40 74 7 2 94 9312K 65 8 2 59 79 8 3 14 Extra Small Series Basic Shoulder Diameters Bearing Shaft S Housing H Number Max Min Max Min mm in mm in mm in mm in 33K3 5 1 0 20 4 8 0 19 8 1 0 32 7 9 0 31 33K4 6 1 0 24 5 8 0 23 11 2 0 44 10 9 0 43 33K5 6 6 0 26 6 4 0 25 11 2 0 44 10 9 0 43 34K 6 6 0 26 6 4 0 25 14 2 0 56 14 0 0 55 35K 9 4 0 37 9 1 0 36 17 0 0 67 16 8 0 66 36K 9 4 0 37 9 1 0 36 17 0 0 67 16 8 0 66 37K 11 2 0 44 10 7 0 42 20 1 0 79 19 6 0 77 38K 11 4 0 45 10 9 0 43 20 1 0 79 19 6 0 77 38KV 11 4 0 45 10 9 0 43 20 1 0 79 19 6 0 77 39K 13 0 0 51 12 5 0 49 23 1 0 91 22 6 0 89 S1K7 8 6 0 34 8 1 0 32 14 2 0 56 13 7 0 54 S1K 9 4 0 37 8 9 0 35 17 5 0 69 17 0 0 67 S3K 12 7 0 50 12 2 0 48 20 3 0 80 19 8 0 78 S5K 16 0 0 63 15 5 0 61 25 1 0 99 24 6 0 97 S7K 21 3 0 84 20 3 0 80 31 5 1 24 30 5 1 20 S8K 24 6 0 97 23 6 0 93 37 1 1 46 35 6 1 40 S9K 28 9 1 14 27 9 1 10 41 9 1 65 40 9 1 61 S10K 31 5 1 24 30 5 1 20 46 7 1 84 45 7 1 80 S11K 34 0 1 34 33 0 1 30 49 5 1 95 48 5 1 91 S12K 39 4 1 55 38 4 1 51 55 9 2 20 50 8 2 00 S H fitting practices continued A130 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A131 Engineering A A130 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A131 Shaft and Housing shoulders Radial ball bearings 9100 13 2 0 52 11 9 0 47 24 1 0 95 23 1 0 91 200 14 2 0 56 12 7 0 50 24 9 0 98 24 6 0 97 300 15 0 0 59 12 7 0 50 30 0 1 18 29 2 1 15 9101 18 0 0 71 14 0 0 55 25 9 1 02 24 6 0 97 201 16 3 0 64 14 7 0 58 26 9 1 06 26 7 1 05 301 17 5 0 69 16 0 0 63 31 0 1 22 30 7 1 21 9102 19 0 0 75 17 0 0 67 30 0 1 18 28 7 1 13 202 19 0 0 75 17 5 0 69 30 0 1 18 29 2 1 15 302 20 6 0 81 19 0 0 75 36 1 1 42 35 6 1 40 9103 20 6 0 81 19 0 0 75 33 0 1 30 31 8 1 25 203 21 3 0 84 19 6 0 77 34 0 1 34 33 3 1 31 303 23 1 0 91 21 1 0 83 40 9 1 61 40 6 1 60 9104 24 9 0 98 22 6 0 89 37 1 1 46 35 8 1 41 204 25 4 1 00 23 9 0 94 40 9 1 61 40 1 1 58 304 26 9 1 06 23 9 0 94 45 0 1 77 44 4 1 75 9105 30 0 1 18 27 4 1 08 41 9 1 65 40 6 1 60 205 31 0 1 22 29 0 1 14 46 0 1 81 45 2 1 78 305 33 3 1 31 29 0 1 14 55 1 2 17 53 1 2 09 9106 35 1 1 38 34 0 1 34 49 0 1 93 47 8 1 88 206 37 3 1 47 34 0 1 34 56 1 2 21 54 9 2 16 306 39 6 1 56 34 0 1 34 65 0 2 56 62 0 2 44 9107 41 4 1 63 38 9 1 53 56 1 2 21 54 6 2 15 207 43 7 1 72 38 9 1 53 65 0 2 56 62 7 2 47 307 45 2 1 78 42 9 1 69 71 1 2 80 69 1 2 72 9108 46 0 1 81 43 9 1 73 62 0 2 44 60 7 2 39 208 49 3 1 94 43 9 1 73 72 9 2 87 70 6 2 78 308 50 8 2 00 49 0 1 93 81 0 3 19 77 7 3 06 9109 51 6 2 03 49 3 1 94 69 1 2 72 67 8 2 67 209 54 1 2 13 49 3 1 94 78 0 3 07 75 4 2 97 309 2 28 57 9 2 13 54 1 3 58 90 9 3 41 86 6 9110 56 4 2 22 54 1 2 13 73 9 2 91 72 6 2 86 210 59 4 2 34 54 1 2 13 83 1 3 27 80 5 3 17 310 63 5 2 50 59 9 2 36 100 1 3 94 95 2 3 75 9111 63 0 2 48 59 2 2 33 83 1 3 27 81 8 3 22 211 64 5 2 54 61 2 2 41 93 5 3 68 90 4 3 56 311 69 8 2 75 65 0 2 56 110 0 4 33 104 9 4 13 9112 67 8 2 67 64 3 2 53 88 1 3 47 86 9 3 42 212 71 4 2 81 67 8 2 67 101 1 3 98 98 3 3 87 312 74 7 2 94 72 1 2 84 118 1 4 65 112 8 4 44 9113 72 1 2 84 69 1 2 72 93 0 3 66 81 7 3 61 213 77 0 3 03 72 6 2 86 111 0 4 37 106 4 4 19 313 81 0 3 19 77 0 3 03 128 0 5 04 122 2 4 81 9114 79 0 3 11 73 9 2 91 103 1 4 06 100 8 3 97 214 81 8 3 22 77 7 3 06 116 1 4 57 112 0 4 41 314 87 4 3 44 82 0 3 23 137 9 5 43 130 3 5 13 9115 84 1 3 31 79 0 3 11 108 0 4 25 105 7 4 16 215 87 4 3 44 82 6 3 25 120 9 4 76 116 6 4 59 315 98 6 3 88 87 1 3 43 148 1 5 83 139 7 5 50 9116 90 4 3 56 84 1 3 31 118 1 4 65 114 3 4 50 216 93 7 3 69 90 2 3 55 130 0 5 12 125 2 4 93 316 100 1 3 94 91 9 3 62 158 0 6 22 149 4 5 88 9117 95 2 3 75 88 9 3 50 122 9 4 84 119 6 4 71 217 98 6 3 88 95 2 3 75 140 0 5 51 134 9 5 31 317 104 9 4 13 99 1 3 90 166 1 6 54 157 2 6 19 9118 102 4 4 03 97 5 3 84 131 1 5 16 130 3 5 13 218 105 7 4 16 100 1 3 94 150 1 5 91 142 7 5 62 318 111 3 4 38 103 9 4 09 176 0 6 93 165 1 6 50 9120 111 3 4 38 107 4 4 23 141 0 5 55 138 2 5 44 219 111 3 4 38 106 9 4 21 158 0 6 22 153 9 6 06 319 117 6 4 63 109 0 4 29 185 9 7 32 174 8 6 88 9121 118 4 4 66 115 1 4 53 150 1 5 91 146 0 5 75 220 117 6 4 63 112 0 4 41 167 9 6 61 160 3 6 31 320 124 0 4 88 114 0 4 49 200 9 7 91 187 4 7 38 9122 124 7 4 91 119 9 4 72 160 0 6 30 157 0 6 18 221 124 0 4 88 117 1 4 61 178 1 7 01 174 8 6 88 321 130 3 5 13 119 1 4 69 211 1 8 31 196 8 7 75 9124 134 1 5 28 130 0 5 12 169 9 6 69 165 1 6 50 222 130 3 5 13 121 9 4 80 188 0 7 40 179 3 7 06 322 139 7 5 50 124 0 4 88 226 1 8 90 209 6 8 25 9126 147 6 5 81 140 0 5 51 190 0 7 48 184 1 7 25 224 143 0 5 63 132 1 5 20 202 9 7 99 192 0 7 56 324 152 4 6 00 134 1 5 28 246 1 9 69 226 8 8 93 9128 153 9 6 06 147 6 5 81 200 2 7 88 195 1 7 68 226 152 4 6 00 144 0 5 67 215 9 8 50 206 5 8 13 326 163 6 6 44 148 1 5 83 262 1 10 32 246 1 9 69 9130 167 4 6 59 162 1 6 38 213 1 8 39 206 5 8 13 228 165 1 6 50 153 9 6 06 236 0 9 29 223 8 8 81 328 176 0 6 93 158 0 6 22 281 9 11 10 263 7 10 38 9132 176 8 6 96 166 6 6 56 228 6 9 00 222 2 8 75 230 177 0 6 97 164 1 6 46 256 0 10 08 241 3 9 50 330 189 0 7 44 167 9 6 61 302 0 11 89 280 9 11 06 9134 192 0 7 56 182 1 7 17 247 9 9 76 239 8 9 44 232 186 9 7 36 174 0 6 85 276 1 10 87 260 4 10 25 332 188 0 7 84 178 0 7 01 322 1 12 68 294 1 11 58 9138 212 9 8 38 201 9 7 95 278 1 10 95 266 7 10 50 234 202 7 7 98 188 0 7 40 292 1 11 50 276 4 10 88 334 213 4 8 40 188 0 7 40 342 1 13 47 311 7 12 27 9140 224 5 8 84 212 1 8 35 297 9 11 73 285 0 11 22 236 212 9 8 38 198 1 7 80 302 0 11 89 281 7 11 09 336 223 5 8 80 198 1 7 80 362 0 14 25 331 5 13 05 9144 246 4 9 70 233 9 9 21 326 1 12 84 310 9 12 24 238 222 8 8 77 208 0 8 19 322 1 12 68 301 8 11 88 338 237 5 9 35 212 1 8 35 378 2 14 89 345 2 13 59 9148 266 7 10 50 254 0 10 00 345 9 13 62 330 7 13 02 240 239 3 9 42 217 9 8 58 342 1 13 47 319 3 12 57 340 249 9 9 84 222 0 8 74 398 0 15 67 365 0 14 37 9152 291 8 1 1 49 278 1 10 95 382 0 15 04 366 8 14 44 242 246 1 9 69 225 3 8 87 362 2 14 26 336 8 13 26 342 260 1 10 24 232 2 9 14 418 3 16 47 385 3 15 17 9156 313 2 12 33 297 9 11 73 402 1 15 83 386 8 15 23 244 257 6 10 14 238 0 9 37 382 0 15 04 356 6 14 04 344 272 5 10 73 242 1 9 53 437 9 17 24 405 4 15 96 9160 339 3 1 3 36 318 0 12 52 442 0 17 40 421 6 16 60 246 268 7 10 58 247 9 9 76 402 1 15 83 370 8 14 60 348 292 6 11 52 262 1 10 32 478 0 18 82 439 9 17 32 9164 360 4 14 19 338 1 13 31 462 0 18 19 441 7 17 39 248 283 5 11 16 258 1 10 16 421 9 16 61 385 6 15 18 352 318 5 12 54 288 0 11 34 512 1 20 16 474 0 18 66 9180 457 2 18 00 431 8 17 00 561 8 22 12 549 1 21 62 250 293 4 11 55 268 0 10 55 442 0 17 40 398 8 15 70 356 341 1 13 43 308 1 12 13 551 9 21 73 511 3 20 13 Radial ball bearings Extra Light 9100 Series Light 200 5200 7200WN Series Medium 300 5300 7300WN Series Basic Shoulder Diameters Basic Shoulder Diameters Basic Shoulder Diameters Bearing Shaft S Housing H Bearing Shaft S Housing H Bearing Shaft S Housing H Number Max Min Max Min Number Max Min Max Min Number Max Min Max Min mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in mm in fitting practices continued Engineering A A132 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A133 A132 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A133 Shaft and Housing shoulders Radial ball bearings heavy 400 7400 series Basic Shoulder Diameters Bearing Shaft S Housing H Number Max Min Max Min mm in mm in mm in mm in 7405 37 3 1 47 34 0 1 34 71 1 2 80 66 8 2 63 7406 43 7 1 72 39 1 1 54 81 0 3 19 76 2 3 00 7407 49 0 1 93 43 9 1 73 90 9 3 58 85 9 3 38 7408 55 6 2 19 50 0 1 97 100 1 3 94 93 7 3 69 7409 62 0 2 44 55 1 2 17 110 0 4 33 101 6 4 00 7410 68 3 2 69 62 0 2 44 118 1 4 65 111 3 4 38 7411 74 4 2 93 67 1 2 64 128 0 5 04 120 7 4 75 7412 81 0 3 19 72 1 2 84 137 9 5 43 130 3 5 13 7413 88 9 3 50 77 0 3 03 148 1 5 83 139 7 5 50 7414 93 7 3 69 84 1 3 31 166 1 6 54 155 7 6 13 7415 99 8 3 93 88 9 3 50 176 0 6 93 163 6 6 44 7416 104 9 4 13 94 0 3 70 185 9 7 32 173 0 6 81 7418 119 1 4 69 108 0 4 25 207 0 8 15 196 9 7 75 7420 131 3 5 17 119 9 4 72 233 9 9 21 223 3 8 79 Non Standard Extra Large 120W2 117 6 4 63 111 8 4 40 150 1 5 91 146 0 5 75 122W 124 7 4 91 120 1 4 73 162 8 6 41 158 8 6 25 124W 134 1 5 28 130 0 5 12 178 1 7 01 174 5 6 87 126W 147 8 5 82 139 7 5 50 193 0 7 60 185 7 7 31 128W 157 2 6 19 150 1 5 91 207 8 8 18 202 2 7 96 130W 167 4 6 59 162 1 6 38 223 0 8 78 216 2 8 51 132W 189 0 7 44 174 0 6 85 234 7 9 24 223 8 8 81 134W 191 0 7 52 185 2 7 29 249 7 9 83 244 1 9 61 136W 203 2 8 00 195 3 7 69 264 7 10 42 257 8 10 15 138W 214 4 8 44 205 2 8 08 284 7 11 21 276 1 10 87 224W 143 0 5 63 132 1 5 20 203 2 8 00 192 0 7 56 226 152 4 6 00 144 0 5 67 215 9 8 50 206 5 8 13 228 165 1 6 50 153 9 6 06 236 0 9 29 223 8 8 81 276 2 401 8 15 82 400 1 15 75 463 6 18 25 461 5 18 17 Basic Shoulder Diameters Bearing Shaft S Housing H Number Max Min Max Min mm in mm in mm in mm in Housing shoulder diameters of bearings with Mechani Seals differ slightly from those of other types to allow for clearance between the external rotating member of the seal and the housing shoulder S H S H Non Sta nd ar d Mec hani S ea l KL E xtra L ar ge KL D KLL T ypes Non Standard Extra Large Mechani Seal KL KLD KLL Types fitting practices continued Mechani Seal KL KLD KLL Types Basic Housing Shoulder Bearing Diameter H Number Max Min mm in mm in 36 17 0 0 67 16 8 0 66 36V 17 0 0 67 16 8 0 66 37 20 1 0 79 19 6 0 77 37V 20 1 0 79 19 6 0 77 34 20 1 0 79 19 6 0 77 38V 20 1 0 79 19 6 0 77 39 23 1 0 91 22 6 0 89 39V 23 1 0 91 22 6 0 89 200 27 7 1 09 26 2 1 03 201 29 5 1 16 27 7 1 09 20 2 29 5 1 16 27 7 1 09 201 3 29 5 1 16 27 7 1 09 202 32 5 1 28 31 0 1 22 202 2 32 5 1 28 31 0 1 22 202 3 32 5 1 28 31 0 1 22 202 4 32 5 1 28 31 0 1 22 203 36 6 1 44 35 8 1 41 204 43 7 1 72 41 1 1 62 204 2 43 7 1 72 41 1 1 62 205 48 5 1 91 46 7 1 84 205 2 48 5 1 91 46 7 1 84 206 57 9 2 28 56 4 2 22 207 67 6 2 66 64 3 2 53 208 75 4 2 97 71 4 2 81 209 80 3 3 16 77 0 3 03 209 2 80 3 3 16 77 0 3 03 211 93 7 3 69 90 4 3 56 A132 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A133 Engineering A A132 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A133 1008KRR RA008RR GRA008RR GYA0008RR 1 2 RA009RR GRA009RR GYA009RR 9 16 203 1 5748 1 5754 0 0005 1 37 1 34 1010KRR KR G1010KRR RA010RR GRA010RR GYA010RR 5 8 4 0 000 40 015 0 013 34 8 34 0 1011KRR G1011KRR 11 16 E17KRR GE17KRR RAE17RR GRAE17RR GYAE17RR 17 1012KRR KR G1012KRR RA012RR GRA012RR GYA012RR 3 4 204 1 8504 1 8510 0 0005 1 61 1 60 E20KRR GE20KRR RAE20RR GRAE20RR GYAE20RR 20 47 000 47 015 0 013 40 9 40 6 1013KRR RA013RR GRA013RR GYA013RR 13 16 1014KRR G1014KRR RA014RR GRA014RR GYA014RR 7 8 205 2 0472 2 0479 0 0006 1 81 1 80 1015KRR KR G1015KRR RA015RR GRA015RR GYA015RR 15 16 51 999 52 017 0 015 46 0 45 7 1100KRR KR G1100KRR RA100RR GRA100RR GYA100RR 1 E25KRR GE25KRR RAE25RR GRAE25RR GYAE25RR 25 G1101KRR RA101RR GRA101RR GYA101RR 1 1 16 1102KRR KR G1102KRR RA102RR GRA102RR GYA102RR 1 1 8 206 2 4409 2 4416 0 0006 2 21 2 16 1103KRR KR G1103KRR RA103RR GRA103RR GYA103RR 1 3 16 61 999 62 017 0 015 56 1 54 9 GYA103RR2 1 1 4 E30KRR GE30KRR RAE30RR GRAE30RR GYAE30RR 30 1104KRR KR G1104KRR RA104RR GRA104RR GYA104RR 1 1 4 1105KRR RA105RR GRA105RR GYA105RR 1 5 16 207 2 8346 2 8353 0 0006 2 56 2 47 1106KRR G1106KRR RA106RR GRA106RR GYA106RR 1 3 8 71 999 72 017 0 015 56 1 54 9 1107KRR KR G1107KR RRA107RR GRA107RR GYA107RR 1 7 16 E35KRR GE35KRR RAE35RR GRAE35RR GYAE35RR 35 1108KRR KR G1108KRR RA108RR GRA108RR GYA108RR 1 1 2 208 3 1496 3 1503 0 0006 2 87 2 78 RA106RR GRA109RR GYA109RR 1 9 16 80 000 80 018 0 020 78 0 75 4 GRAE40RR GYAE40RR 40 1110KRR G1110KRR RA110RR GRA110RR GYA110RR 1 5 8 1111KRR KR G1111KRR RA111RR GRA111RR GYA111RR 1 11 16 209 3 3465 3 3474 0 0008 3 07 2 97 1112KRR KR G1112KRR RA112RR GRA112RR GYA112RR 1 3 4 85 001 85 024 0 020 78 0 75 4 E45KRR GRAE45RR GYAE45RR 45 RA113RR GRA113RR GYA113RR 1 13 16 1114KRR RA114RR GRA114RR GYA114RR 1 7 8 210 3 5433 3 5442 0 0008 3 27 3 19 1115KRR KR G1115KRR RA115RR GRA115RR GYA115RR 1 15 16 90 000 90 023 0 020 83 1 81 0 GRA115RR2 2 E50KRR GE50KRR RAE50RR GRAE50RR GYAE50RR 50 1200KRR KR G1200KRR RA200RR GRA200RR GYA200RR 2 RA201RR GRA201RR GYA201RR 2 1 16 211 3 9370 3 9379 0 0008 3 58 3 56 1202KRR RA202RR GRA202RR GYA202RR 2 1 8 100 000 100 023 0 020 90 9 90 4 1203KRR KR G1203KRR RA203RR GRA203RR GYA203RR 2 3 16 E55KRR GE55KRR RAE55RR GRAE55RR GYAE55RR 55 1204KRR 2 1 4 212 4 3307 4 3316 0 0008 3 98 3 87 1207KRR KR G1207KRR 2 7 16 110 000 110 02 0 020 101 1 98 3 E60KRR GE60KRR 60 1215KRR 2 15 16 215 5 1181 5 1191 0 0009 4 76 4 59 E75KRR 75 13 0 000 130 025 0 023 120 9 116 6 WIDE INNER RING BALL BEARINGS DH When shafts are selected for use with wide inner ring bearings a minimum slip fit is very desirable for the most satisfactory mounting Special shaft limits are required in certain cases and a variety of standard fits can be used including a press fit The suggested figures are noted below In some applications it may be permissible to use increased shaft tolerances In such cases applications should be forwarded to your Timken representative for complete suggestions Bearing bore tolerance 1 2 2 3 16 nominal to 013 mm 0005 2 1 4 3 3 16 nominal to 015 mm 0006 3 7 16 3 15 16 nominal to 018 mm 0007 Shaft tolerances 1 2 1 15 16 nominal to 013 mm 0005 2 3 15 16 nominal to 025 mm 0010 Bearing Number Shaft Basic House Stationary 1 Shoulder Diameter Size Outer H KRR G KRR RA RR GRA RR GYA RR Ring Housing Bore D Mean Fit Type Type Type Type Type Size Min Max Loose Max Min mm mm mm mm mm mm in in in in in in Housing Shoulders and Shaft Diameters fitting practices continued 1 When the housing revolves in relation to the shaft housing bore dimensions shown on page A134 should be used Outer ring tolerances and housing fillet radii correspond to equivalent 299 Series single row radial bearings Available as non relubricatable type omit Prefix G Engineering A A134 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A135 A134 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A135 Shaft and Housing Fits Radial spherical roller bearings These charts are guidelines for specifying shaft and housing fits related to particular operating conditions 1 For solid steel shaft See tables on pages A62 A72 for numerical value Bearings with Straight Bore Conditions Examples Shaft Diameter Tolerance Symbol 1 Remarks mm See table below The inner ring to be easily Two bearing See table below for shaft size Stationary displaced on the shaft shaft mechanism for shaft size s4 inner ring load The inner ring not to Wheel on non rotating shaft All diameters g6 be easily displaced on the shaft Tension pulleys and rope sheaves h6 Electrical apparatus machine over incl In very accurate applications Light and variable loads tools pumps ventilators 18 100 k6 k5 and m5 are used instead P 0 07C industrial trucks 100 200 m6 of k6 and m6 respectively Rotating 18 65 m5 inner ring load Normal and heavy loads Applications in general electrical 65 100 m6 or indeterminate P 0 07C motors turbines pumps combustion 100 140 n6 load direction 0 25C engines gear transmissions 140 280 p6 woodworking machines 280 500 r6 500 and up r7 18 65 m6 Very heavy loads and shock loads Journal boxes for locomotives and 65 100 n6 Bearings with greater clearance P 0 25C other heavy rail vehicles 100 140 p6 than normal must be used traction motors 140 200 r6 200 500 r7 Bearings with Tapered Bore and Adapter Sleeve All loads Applications in general All diameters See tables for Reduction of RIC on page A76 Shaft s4 fits A centrifugal force load produces a rotating outer ring load and a stationary inner ring load even though the inner ring rotates This makes it desirable to fit the outer ring tight in the housing using a P6 fit as shown on pages A63 and A69 and the inner ring loose on the shaft using an s4 fit as listed in the table The standard W33 bearing with oil groove and oil holes can be used Note The s4 fit designation as referenced on this page is a special fit tolerance developed by The Timken Company for this specific application It DOES NOT conform to ISO standards similarly published as s4 preferred shaft fits Data shown in thousandths of a millimeter 15 0 015 mm or ten thousandths of an inch 6 0006 See dimensional tables for nominal bore Bore Variance from Nominal Bore mm Tolerance Shaft Diameter Fit over incl 0 Max Min mm mm mm mm in in in in 50 80 15 25 36 10L 36 L 6 10 14 4L 14L 80 120 20 33 43 13L 43 L 8 13 17 5L 17L 120 180 25 41 53 15L 53 L 10 16 21 6L 21L 180 250 30 48 64 18L 64 L 12 19 25 7L 25L s4 FITS fitting practices continued A134 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A135 Engineering A A134 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A135 Conditions Examples Tolerance Remarks Symbol 2 Variable load direction Two bearing eccentric shaft mechanism P6 Rotating Heavy loads on bearings in Supporting wheels in cranes outer thin walled housings wheel hubs crank bearings P7 One piece ring load Normal and heavy loads Wheel hubs crank bearings N7 The outer ring is not displaceable axially bearing Light and variable loads Conveyor rollers rope sheaves housing tension pulleys M7 Heavy shock loads Electrical traction motors Heavy and normal loads axial Indeterminate displacement of outer ring Electrical motors pumps K7 The outer ring is as a rule load direction not required crankshaft main bearings not displaceable axially Normal and light loads axial displacement of the outer Electrical motors pumps ring desirable crankshaft main bearings The outer ring is as a rule Shock loads temporarily complete displaceable axially Split or one unloading Journal boxes for rail vehicles J7 piece bearing Stationary All loads Bearing applications in general housing outer journal boxes for rail vehicles H7 ring load Normal and light loads loads under The outer ring is easily displaced axially simple operating conditions Line shaftings H8 Heat supplied through the shaft Dryer cylinders G7 For main O D less than 125 mm M6 Very accurate running and small spindles O D 125 to 250 mm N6 The outer ring is not displaceable axially deflections under variable loads in machine O D over 250 mm P6 Applications tools One piece requiring Very accurate running under Held bearings in high speed bearing particular light loads and indeterminate centrifugal force compressors K6 The outer ring is as a rule housing accuracy load direction not displaceable axially Very accurate running axial Floating bearings in high speed displacement of outer ring centrifugal force compressors J6 The outer ring is easily displaced axially desirable 2 Cast iron or steel housing For numerical values see tables on pages A62 A69 For housings of light metal tolerances generally are selected which give a slightly tighter fit than those given in the table These charts are guidelines for specifying shaft and housing fits related to particular operating conditions Shaft and Housing Fits Radial spherical roller bearings Housing fitting practices continued Engineering A A136 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A137 A136 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A137 Bearing Bore Shaft Diameter Bearing Bore Shaft Diameter Nominal Min Nominal Max Interference Fit Loose Fit over incl Max Min over incl Max Min Max Min mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in 0 000 171 450 0 0 030 0 000 5 04 825 0 076 0 0 152 0 076 0 0000 6 7500 0 0 0012 0 0000 19 8750 0 0030 0 0 0060 0 0030 171 450 5 08 000 0 0 038 5 04 825 1524 000 0 127 0 0 254 0 127 6 7500 20 0000 0 0 0015 19 8750 60 0000 0 0050 0 0 0100 0 0050 Bearing Bore Housing Bore Bearing O D Shaft Diameter Nominal Min Nominal Max Loose Fit Interference Fit over incl Max Min over incl Max Min Max Min mm mm mm mm mm mm mm mm mm mm in in in in in in in in in in 119 858 441 325 0 229 0 127 0 000 584 000 0 152 0 076 0 152 0 076 4 7188 17 3750 0 0090 0 0050 0 0000 23 0000 0 0060 0 0030 0 0060 0 0030 441 325 1000 000 0 254 0 152 584 000 1778 000 0 254 0 127 0 254 0 127 17 3750 39 3701 0 0100 0 0060 23 0000 70 0000 0 0100 0 0050 0 0100 0 0050 Housing Housing TYPE TVB TYPE TVL and dtvl Shaft Shaft Shaft and housing diameters shown as variance from nominal dimensions Shaft and housing data shown in millimeters over inches Shaft and Housing Fits Thrust ball bearings Dowel pin suggested Dowel pin required fitting practices continued A136 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A137 Engineering A A136 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A137 Bearing O D Housing Bore Nominal Max Springs in Combined Axial Radial Load Housing Light Radial Stationary Rotating inches Load Outer Ring Outer Ring over incl Min Max Min Max Min Max mm mm mm mm mm mm mm mm in in in in in in in in 180 250 15 61 18 28 33 13 7 0866 9 8425 6 24 7 11 13 5 250 315 18 69 18 33 36 15 9 8425 12 4016 7 27 7 13 14 6 315 400 18 74 18 38 41 15 12 4016 15 7480 7 29 7 15 16 6 400 500 20 84 23 41 46 18 15 7480 19 6850 8 33 9 16 18 7 500 630 23 91 23 46 48 20 19 6850 24 8031 9 36 9 18 19 8 630 800 23 102 23 51 51 23 24 8031 31 4960 9 40 9 20 20 9 800 1000 25 109 25 58 58 25 31 4960 39 3700 10 43 10 23 23 10 1000 1250 28 122 28 66 64 30 39 3700 49 2126 11 48 11 26 25 12 Bearing Bore Shaft Diameter Nominal Max Stationary Load Rotating Load inches over incl Max Min Max Min mm mm mm mm mm mm in in in in in in 80 12 0 13 10 25 3 3 1496 4 7244 5 4 10 1 120 180 15 10 28 3 4 7244 7 0866 6 4 11 1 180 200 18 13 36 5 7 0866 7 8740 7 5 14 2 200 240 18 13 46 15 7 8740 9 4488 7 5 18 6 240 315 18 15 51 20 9 4488 12 4016 7 6 20 8 315 400 18 18 56 20 12 4016 15 7480 7 7 22 8 400 500 23 18 86 46 15 7480 19 6850 9 7 34 18 500 630 23 20 86 43 19 6850 24 8031 9 8 34 17 Tolerances are 1 1000 of a millimeter m and 1 10 000 of an inch 5 0005 Tolerances are 1 1000 of a millimeter m and 1 10 000 of an inch 5 0005 Shaft Housing Shaft and Housing Fits Thrust spherical roller bearing Tolerances for housing bore and for shaft diameters are shown as variance from nominal bearing dimension Data is shown in inches over millimeters When application calls for thrust loads only the housing must be relieved by 1 16 in on diameter so that no radial load is carried on the bearing All tolerances are in number of micrometers m and ten thousandths of an inch 0001 in 5 LVTD DNA LVT EPYT TFAHS eroB gniraeBretemaiD tfahS xaM lcnIrevO niM xaM ni ni ni ni ni mmmmmmmmmm 0 0 0578 910000 02100 0 0 0 0 528 405000 0030 0 0 0500 0 0010 0 0 0500 0 0000 060578 915100 0 0 721 0 452 0 0 721 0 000 4251528 405830 0 0 GNISUOH retemaiD tfahS D O gniraeBeroB gnisuoH nominal max Loose Fit Interference Fit niM xaM niM xaM lcnIrevO niM xaM ni ni ni ni ni ni ni ni mmmmmmmmmmmmmmmm 0300 0 0600 0 0300 00600 0 0000 320000 00500 0 0900 0 670 0 251 0 670 0251 0 000 485000 0721 0 922 0 0500 0 0010 0 0500 00010 0 0000 070000 320600 0 0010 0 721 0 452 0 721 0452 0 000 8771000 485251 0 452 0 deriuqer nip lewoD detseggus nip lewoD deriuqer nip lewoD detseggus nip lewoD HOUSING Tolerances are 1 10 000 of an inch 5 0005 and 1 1000 of a millimeter m eroB gnisuoH D O gniraeB nominal max Springs in Combined Axial Radial Load Housing Light Radial Stationary R otating inches Load Outer Ring Outer Ring m retemaiD tfahS Housing Bore Shaft Diameter fitting practices continued Engineering A A138 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A139 A138 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A139 Shaft and Housing Fits Thrust cylindrical roller bearings Shaft Type TP and TPS Tolerances for housing bore and for shaft diameters shown as variance from nominal bearing dimension Data shown in millimeters over inches Bearing Bore Shaft Diameter Nominal Min over incl Max Min mm mm mm mm in in in in 47 625 53 975 0 025 0 051 1 8750 2 1250 0 0010 0 0020 53 975 63 500 0 028 0 053 2 1250 2 5000 0 0011 0 0021 63 500 76 200 0 030 0 056 2 5000 3 0000 0 0012 0 0022 76 200 88 900 0 033 0 058 3 0000 3 5000 0 0012 0 0023 88 900 177 800 0 038 0 064 3 5000 7 0000 0 0015 0 0025 177 800 228 600 0 038 0 076 7 0000 9 0000 0 0015 0 0030 228 600 3 04 800 0 046 0 084 9 0000 12 0000 0 0018 0 0330 304 800 381 000 0 051 0 089 12 0000 15 0000 0 0020 0 0035 381 000 482 600 0 051 0 102 15 0000 19 0000 0 0020 0 0040 482 600 584 200 0 064 0 114 19 0000 23 0000 0 0025 0 0045 584 200 762 000 0 076 0 140 23 0000 30 0000 0 0030 0 0055 Housing Type TPS Deviations in m 0 0001 inches Bearing O D Housing Diameter Nominal Min Deviation from D over incl high low mm mm mm mm in in in in 50 800 6 0 325 38 13 2 0000 2 3750 15 5 60 325 82 550 43 18 2 3750 3 2500 17 7 82 550 93 663 48 23 3 2500 3 6875 19 9 93 663 1 01 600 53 28 3 6875 4 0000 21 11 101 600 115 092 71 33 4 0000 4 5312 28 13 115 092 254 000 76 38 4 5312 10 0000 30 15 254 000 457 200 102 51 10 0000 18 0000 40 20 457 200 558 800 127 64 18 0000 22 0000 50 25 558 800 66 0 400 140 64 22 0000 26 0000 55 25 660 400 711 200 152 76 26 0000 28 0000 60 30 711 200 863 600 178 76 28 0000 34 0000 70 30 863 600 965 200 203 89 34 0000 38 0000 80 35 965 200 1117 600 229 102 38 0000 44 0000 90 40 Housing Type TP Bearing O D Housing Bore Nominal Min over incl Max Min mm mm mm mm in in in in 115 092 254 000 0 076 0 038 4 5312 10 0000 0 0030 0 0015 254 000 457 200 0 102 0 051 10 0000 18 0000 0 0040 0 002 457 200 558 800 0 127 0 064 18 0000 22 0000 0 0050 0 0025 558 800 66 0 400 0 140 0 064 22 0000 26 0000 0 0055 0 0025 660 400 711 200 0 152 0 076 26 0000 28 0000 0 0060 0 0030 711 200 863 600 0 178 0 076 28 0000 34 0000 0 0070 0 0030 863 600 965 200 0 203 0 089 34 0000 38 0000 0 0080 0 0035 965 200 1117 600 0 229 0 102 38 0000 44 0000 0 0090 0 0040 TP TPS fitting practices continued A138 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A139 Engineering A A138 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A139 Thrust tapered roller bearings Tolerances for housing bore and shaft diameters are shown as variance from nominal bearing dimension Data is shown in millimeters over inches When one washer is piloted by the housing sufficient clearances must be allowed at the outside diameter of the other washer as well as at the bore of both washers to prevent cross loading of the rollers For most applications this clearance is approximately 1 16 in 1 588 mm 0625 in Shaft and Housing Fits Shaft Types TTVS and TTVF Bearing Bore Shaft Diameter Nominal Min Max O over incl Min mm mm mm in in in 0 000 304 800 0 051 0 0000 12 0000 0 0020 3 04 800 508 000 0 051 12 0000 20 0000 0 0020 5 08 000 711 200 0 076 20 0000 28 0000 0 0030 711 200 1219 200 0 102 28 0000 48 0000 0 0040 1219 200 1727 200 0 127 48 0000 68 0000 0 0050 Housing Bearing Bore Housing Nominal Min Bore over incl Max Min mm mm mm mm in in in in 161 925 265 113 0 060 0 025 6 3750 10 4375 0 0025 0 0010 265 113 317 500 0 076 0 025 10 3475 12 5000 0 0030 0 0010 317 500 482 600 0 102 0 051 12 5000 19 0000 0 0040 0 0020 482 600 603 250 0 113 0 051 19 0000 23 7500 0 0045 0 0020 603 250 711 200 0 152 0 076 23 7500 28 0000 0 0060 0 0030 711 200 838 200 0 178 0 076 28 0000 33 0000 0 0070 0 0030 Types TTVS and TTVF Rotating race O D must have a minimum radial clearance of 2 5 mm 0 1 in TTHD stationary race O D must have a minimum loose fit of 0 25 to 0 37 mm 0 01 to 0 015 in TTHDFL washer when stationary may be loose fit on its O D same as the TTHD or may be 0 025 to 0 076 mm 0 001 to 0 003 in tight BORE Rotating Race Stationary Race mm in Class 2 Class 3 Class 2 and 3 over incl Tolerance Shaft O D Resultant Tolerance Shaft O D Resultant Deviation Fit Deviation Fit 0 3 04 800 0 76 76 T 0 51 51 T 25 50 25 T 13 38 25 T 0 12 0 30 30 T 0 20 20 T 10 20 10 T 5 15 10 T 304 800 609 600 0 152 152 T 0 102 102 T 51 102 51 T 25 76 51 T 12 24 0 60 60 T 0 40 40 T 20 40 20 T 10 30 20 T 609 600 914 400 0 204 204 T 0 127 127 T Provide a minimum radial 76 127 51 T 38 89 51 T All clearance of 2 5 mm 0 1 in 24 36 0 80 80 T 0 50 50 T sizes between race bore 30 50 20 T 15 35 20 T and shaft O D 914 400 1219 200 0 254 254 T 0 153 153 T 102 153 51 T 51 102 51 T 36 48 0 100 100 T 0 60 60 T 40 60 20 T 20 40 20 T 1219 200 0 305 305 T 0 204 204 T 127 178 51 T 76 127 51 T 48 0 120 120 T 0 80 80 T 50 70 20 T 30 50 20 T Fitting guidelines TTHD bearings Tolerances and fits in m and 0 0001 in TTVS TTVF TTHD fitting practices continued Engineering A A140 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A141 A140 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A141 Axial Endplay Bearing Setting Setting Tapered Roller Bearings Setting is defined as a specific amount of either endplay or preload Establishing the setting at the time of assembly is an inherent advantage of tapered roller bearings They can be set to provide optimum performance in almost any application The following figure gives an example of the relationship between fatigue life and bearing setting Unlike some types of anti friction bearings tapered roller bearings do not rely strictly on housing or shaft fits to obtain a certain bearing setting One race can be moved axially relative to the other to obtain the desired bearing setting Relationship between bearing setting and fatigue life At assembly the conditions of bearing setting are defined as Endplay An axial clearance between rollers and races producing a measurable axial shaft movement when a small axial force is applied first in one direction then in the other while oscillating or rotating the shaft Preload An axial interference between rollers and races such that there is no measurable axial shaft movement when a small axial force is applied in both directions while oscillating or rotating the shaft Line to line A zero setting condition the transitional point between endplay and preload Internal clearance Endplay Bearing setting obtained during initial assembly and adjustment is the cold or ambient bearing setting and is established before the equipment is subjected to service Bearing setting during operation is known as the operating bearing setting and is a result of changes in the ambient bearing setting due to thermal expansion and deflections encountered during service The ambient bearing setting necessary to produce the optimum operating bearing setting varies with the application Application experience or testing generally permits the determination of optimum settings Frequently however the exact relationship of ambient to operating bearing setting is an unknown and an educated estimate has to be made To determine a suggested ambient bearing setting for a specific application consult your Timken representative Generally the ideal operating bearing setting is near zero to maximize bearing life Most bearings are set with endplay at assembly to reach the desired near zero setting at operating temperature when mounted Standard mounting Operating setting mounted setting temperature effect deflection Pre set assemblies Mounted EP or PL Bench EP or Bench PL effect of fits Operating setting mounted EP or PL MEP or MPL temperature effect deflection The temperature and fit effects will depend upon the type of mounting bearing geometry and size shaft and housing size and material according to the following sketch Dimensions affecting the effects of temperature and fit DH DoDdo ds d A140 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A141 Engineering A A140 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A141 L Direct mounting 1 2 Indirect mounting 1 2 L 1 2 Temperature effect In a two row mounting Symbols used S interference fit of inner race on shaft H interference fit of outer race in housing Kn K factor for bearing n d bearing bore diameter do mean inner race diameter D bearing outside diameter Do mean outer race diameter L distance between bearing geometric center lines mm in coefficient of linear expansion 11 x 10 6 C 6 1 x 10 6 F for ferrous metal shaft and housing materials dS shaft inside diameter DH housing outside diameter T temperature difference between shaft inner race rollers and housing bearing outer race Direct Mounting T K1 x Do1 K2 x Do2 L 0 39 2 0 39 2 Indirect Mounting T K1 x Do1 K2 x Do2 L 0 39 2 0 39 2 Note Positive lateral loss is the amount of setting reduction or loss of endplay fit effect single row Solid shaft heavy section housing Inner Race F 0 5 K d S 0 39 do Outer Race F 0 5 K D H 0 39 Do Hollow shaft thin wall section Inner Race F 0 5 K d 0 39 do Outer Race F 0 5 K Do 0 39 D 1 Do 2 DH 1 D 2 DH 1 ds 2 do 1 ds 2 d S H Note These equations apply only to ferrous shaft and housing Setting methods for tapered roller bearings Upper and lower limits of bearing setting value are determined by consideration of the following factors Application type Duty Operational features of adjacent mechanical drive elements Changes in bearing setting due to temperature differentials and deflections Size of bearing and method of obtaining bearing setting Lubrication method Housing and shaft material The setting value to be applied during assembly will depend on any changes that may occur during operation In the absence of experience with bearings of similar size and operating conditions bearing setting range suggestions should be obtained from your Timken representative Use the push pull method manual setting to measure any axial endplay used as reference while rotating the shaft or the housing Correct this reference value to the final required endplay or preload by changing the setting on the adjusting device Fig A 25 and A 26 are typical examples of manual setting applications Fig A 25 Axial clearance endplay Fig A 26 Truck nondriven wheel Direct mounting Indirect mounting Bearing setting continued Thermal Lateral Loss Thermal Lateral Loss Engineering A A142 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A143 A142 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A143 Preset bearing assemblies Fig A 27 Typical preset bearing assemblies AP TDI with outer race spacer TDO with inner race spacer TNA TNASW TNASWE SR SS TQO If the application requires the use of multi row bearing assemblies preset bearings can be used Fig A 27 Various types of multi row bearing combinations can be provided with spacers that are ground and custom fitted to provide a bearing setting to meet the requirements of the application Fig A 28 Types SS TDI TDIT and TDO listed in this publication are examples Each matched assembly has an identifying serial number marked on each outer race inner race and spacer Some small preset assemblies are not marked with a serial number but their component parts are supplied as a boxed set A preset bearing assembly contains a specific fixed internal clearance or preload built in during manufacture The value of this setting is referred to as bench endplay BEP or bench preload BPL and is normally determined by The Timken Company during the design stage of new equipment Components from one bearing assembly are NOT interchangeable with similar parts from another Bearing settings for types TNA TNASW TNASWE standard version and SR bearings are obtained through close axial tolerance control and components from these assemblies are interchangeable for bearings having bore sizes under 305 mm 12 in Bearing setting continued A142 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A143 Engineering A A142 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A143 Acro Set TM The Acro Set method is achieved through measurement of a shim or spacer gap with a specified set up load applied The correct shim or spacer dimension is then taken from a prepared chart or by a direct instrument reading This technique is based on Hooke s law which states that within the elastic limit deformation or deflection is proportional to the load applied It is applicable to either endplay or preload bearing settings Torque Set TM The Torque Set technique is a method of obtaining correct bearing settings by using low speed bearing rolling torque as a basis for determining the amount of deformation or deflection of the assembly parts affecting bearing settings This technique is applicable regardless of whether the final bearing setting is preload or endplay Projecta Set TM The Projecta Set technique is used to project an inaccessible shim or spacer gap to a position where it can easily be measured This is achieved using a spacer and a gauging sleeve The Projecta Set technique is of most benefit on applications where the inner and outer races are an interference fit and therefore disassembly for adjustment is more difficult and time consuming than with loose fitting races Deciding which automated bearing setting technique should be used must be made early in the design sequence It is necessary to review each application to determine the most economical method and necessary fixtures and tools The final decision will be based on the size and weight of the unit machining tolerances production volume access to retaining devices locknuts end plates etc and available tools Your Timken representative can assist in determining the best method to obtain the correct bearing setting Duplex sets of ball Bearings and Preloading Two single row ball bearings manufactured specially for use as a unit are known as a duplex bearing It may be considered analogous to a double row bearing having the same bore and outside diameter but twice the single row bearing width The main purpose of duplex bearings in an application is to achieve greater axial and radial rigidity than is possible with one single row bearing The extra stiffness in these bearings is obtained by preloading Preloading is incorporated into bearings by selective face grinding which is described in detail below Although angular contact bearings such as the 7000 M WI and MMWI types are more commonly used in duplex arrangements other types of bearings such as radial single row open shielded and sealed types can be duplexed where required to meet specific conditions The Timken Company has developed various automated bearing setting techniques The advantages of these techniques are Reduced set up time Reduced assembly cost Increased consistency and reliability of bearing settings In most cases they can be applied to the assembly line for moderate and high volume production It is possible to select and adapt one of the following automated setting methods for a wide range of applications Set Right TM This technique applies the laws of probability The setting in the bearing is controlled by the radial and axial tolerances of the various components of the assembly Fig A 28 Bearing setting Preloading Preloading to a predetermined value is accomplished by grinding a certain amount of material off inner or outer ring faces so that before mounting the two single bearings as a duplex pair the faces on abutting sides are offset an amount equal to the deflection under the preload When mounted these faces are clamped together so that the bearings are subjected to an internal load caused by one bearing opposing the other This preloading materially decreases subsequent deflection due to external loads applied to the clamped up pair Timken has established for each bearing size standard preload levels which are considered proper for most duplex bearing applications Special preloads can also be provided to satisfy Bearing setting continued Engineering A A144 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A145 A144 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A145 B2 B 1 C 1 C 2 A T 2T 1 Load T Deflectio n Typical Applications Deep well pumps marine propeller shafts machine tool spindles gear shafts speed reducers elevator worm drives and similar applications often require the use of preloaded duplex bearings Width Tolerances To allow for face grinding of single bearings to specified preload for use in duplex pairs or other multiple bearing units the inner and outer ring width tolerance of each bearing is greater than that for a standard single bearing as follows The inner and outer ring width tolerances of duplex pairs and other multiple bearing units equal the tolerances listed above times the number of bearings in the unit For example a duplex pair of 2MM9115 WI DUL bearings has an inner and outer ring width tolerance of 010 in x 2 or 020 in Mountings of Ball bearings Duplex bearings may be used with spacers between the matching faces in order to increase the system s resistance to moment loading or to increase the system rigidity by using the bearings to minimize shaft deflection Shaft and housing spacers should be ground together on a surface grinder to obtain exactly equal lengths to assure that the built in preload will be maintained Since duplex bearings provide a very rigid mounting it is important that special attention be given to correct shaft and housing fits squareness of shaft and housing shoulders and alignment of all mating parts In order to prevent cramping of bearings and an abnormal increase in preload which could result in excessive heat and possible bearing damage suggested shaft and housing tolerances must be followed shaft and housing shoulders must be square bearing spacers must be of equal length and all parts must be free of nicks and burrs Typical preloaded mountings are shown here Fig A 29 Axial load deflection curve of back to back mounted angular contact bearings Curve A is for Bearing A B is for bearing B and C1 and C2 are preload curves Bearing Bore Width Tolerance Width Tolerance mm ABEC ABEC over incl 1 3 5 7 9 0 50 000 010 000 010 50 80 000 015 000 010 80 120 000 015 000 015 120 180 000 020 000 015 180 315 000 020 000 020 315 400 000 025 000 025 extreme requirements For example a heavily loaded slow speed rotating shaft may require heavier than normal preload in order to minimize deflection It must be remembered however that although heavy preload provides slightly greater rigidity it reduces bearing life and increases power consumption therefore preload levels should be chosen with care The axial deflection of a bearing subject to thrust loading is based on Hertz s theories for elastic bodies in contact The general expression is K T 2 1 3 nd 2 where axial deflection K a constant based on bearing geometry T thrust load applied n number of balls d ball diameter A typical axial deflection curve for an unpreloaded single row angular contact bearing is shown in Figure A 29 as curve A This curve represents the deflection characteristics of bearing A being subjected to thrust load T The amount of deflection due to load T1 is much greater than the increase in deflection caused by doubling the thrust load to T2 This illustrates the non linear deflection of a ball bearing Curves C1 and C2 show the deflection of bearings A and B flushmounted as a pair shown below with each bearing having a preload of T1 and T2 lbs respectively Comparing curves C1 and C2 with A shows the deflection of the preloaded pair is much less than that of a single unpreloaded bearing This has been accomplished essentially by eliminating the high deflection points of curve A from no load to T1 or T2 lbs Curves B1 and B2 show the axial deflection of bearing B as mounted in Figure A 30 below from the preloaded conditions T1 or T2 to a no preload condition Preloading can be accomplished by the use of springs or spacer width adjustment but your Timken representative should be consulted for design review Bearing B Bearing A T Fig A 30 Typical preload mountings Bearing setting continued A144 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A145 Engineering A A144 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A145 Typical mountings of duplex bearings Back to Back Mounting DB or O Contact angles diverging toward shaft centerline Before mounting there is clearance between the two adjacent inner ring faces After mounting these faces are clamped together to provide an internal preload on each bearing This arrangement is well suited for pulleys sheaves and in other applications where there are overturning loads and also in all floating positions where thermal expansion of shaft occurs It also provides axial and radial rigidity and equal thrust capacity in either direction when used in a fixed location Back to back is the most commonly used of all duplex arrangements Specify bearing number followed by suffix DU Examples 7207W DU 2MM207WI DU Also available as two single flush ground bearings e g 7207W SU 2 bearings Face to Face Mounting DF or X Contact angles converging toward shaft centerline Before mounting there is clearance between the two adjacent outer ring faces After mounting these faces are clamped together between the housing shoulder and cover plate shoulder providing an internal preload on each bearing This arrangement provides equal thrust capacity in either direction as well as radial and axial rigidity Since the face to face mounting has inherent disadvantages of low resistance to moment loading and thermal instability it should not be considered unless a significantly more convenient method of assembly or disassembly occurs from its use Timken pairs for face to face mounting should be ordered as DU Examples 7212W DU 2M212WI DU Also available as two single flush ground bearings e g 7212W SU two bearings Tandem Mounting DT Before mounting the inner ring faces of each bearing are offset from the outer ring faces After mounting when a thrust load is applied equal to that of twice the normal preload the inner and outer ring faces are brought into alignment on both sides This arrangement provides double thrust capacity in one direction only More than two bearings can be used in tandem if additional thrust capacity is required Timken pairs for tandem mounting should be specified as DU Examples 7205W DU 2M205WI DU Also available as two single flush ground bearings with suffix SU e g 7210W SU two bearings Other Mountings Flush ground DU pairs may be mounted in combination with a single flush ground bearing as a triplex TU set shown below illustrates a quadruplex QU set where three bearings in tandem are mounted back to back with a single bearing These arrangements provide high capacity in one direction and also a positively rigid mounting capable of carrying a moderate amount of reverse thrust Engineering 64 U n d e r t h r u s t l o a d e q u i v a l e n t t o t w i c e t h e n o r m al p r e l o a d I n n e r a n d O u t e r r i n g f a c es ar e f l u sh o n b o t h s i d es DT O n e s t a m p e d a nd o n e u n s t a m p e d O u t e r r i n g f a c e t o g e t h e r MountedBefore Mounting I n n e r a nd o u t e r r i n g f a c es no t f l u sh o n e i t h e r s i d e In n e r r i n g f a c es c l a m p e d t o g e t h e r T h e s e I n n e r a nd O u t e r r i n g f a c es a r e f l u sh Cl e a r a n c e b e t w e en In n e r r i ng f a c es DB S t a m p e d f a c es o f O u t e r r i n g s to g e t h e r MountedBefore Mounting In n e r a n d O u t er r i n g f a c es c l a m p e d t o g e t h e r C l e a r a n c e b e t w e en O u t e r r i n g f a c es DF U n s t a m p e d f a c es o f O u t e r r i n gs to g e t h e r MountedBefore Mounting T h e s e I n n e r a n d O u t e r r i n g f a c es n o t f l u sh F a c e s f l u sh o n b o t h s i d es Figure A Figure B Engineering 64 U n d e r t h r u s t l o a d e q u i v a l e n t t o t w i c e t h e n o r m al p r e l o a d I n n e r a n d O u t e r r i n g f a c es ar e f l u sh o n b o t h s i d es DT O n e s t a m p e d a nd o n e u n s t a m p e d O u t e r r i n g f a c e t o g e t h e r MountedBefore Mounting I n n e r a nd o u t e r r i n g f a c es no t f l u sh o n e i t h e r s i d e In n e r r i n g f a c es c l a m p e d t o g e t h e r T h e s e I n n e r a nd O u t e r r i n g f a c es a r e f l u sh Cl e a r a n c e b e t w e en In n e r r i ng f a c es DB S t a m p e d f a c es o f O u t e r r i n g s to g e t h e r MountedBefore Mounting In n e r a n d O u t er r i n g f a c es c l a m p e d t o g e t h e r C l e a r a n c e b e t w e en O u t e r r i n g f a c es DF U n s t a m p e d f a c es o f O u t e r r i n gs to g e t h e r MountedBefore Mounting T h e s e I n n e r a n d O u t e r r i n g f a c es n o t f l u sh F a c e s f l u sh o n b o t h s i d es Figure A Figure B Engineering 64 U n d e r t h r u s t l o a d e q u i v a l e n t t o t w i c e t h e n o r m al p r e l o a d I n n e r a n d O u t e r r i n g f a c es ar e f l u sh o n b o t h s i d es DT O n e s t a m p e d a nd o n e u n s t a m p e d O u t e r r i n g f a c e t o g e t h e r MountedBefore Mounting I n n e r a nd o u t e r r i n g f a c es no t f l u sh o n e i t h e r s i d e In n e r r i n g f a c es c l a m p e d t o g e t h e r T h e s e I n n e r a nd O u t e r r i n g f a c es a r e f l u sh Cl e a r a n c e b e t w e en In n e r r i ng f a c es DB S t a m p e d f a c es o f O u t e r r i n g s to g e t h e r MountedBefore Mounting In n e r a n d O u t er r i n g f a c es c l a m p e d t o g e t h e r C l e a r a n c e b e t w e en O u t e r r i n g f a c es DF U n s t a m p e d f a c es o f O u t e r r i n gs to g e t h e r MountedBefore Mounting T h e s e I n n e r a n d O u t e r r i n g f a c es n o t f l u sh F a c e s f l u sh o n b o t h s i d es Figure A Figure B Engineering 64 U n d e r t h r u s t l o a d e q u i v a l e n t t o t w i c e t h e n o r m al p r e l o a d I n n e r a n d O u t e r r i n g f a c es ar e f l u sh o n b o t h s i d es DT O n e s t a m p e d a nd o n e u n s t a m p e d O u t e r r i n g f a c e t o g e t h e r MountedBefore Mounting I n n e r a nd o u t e r r i n g f a c es no t f l u sh o n e i t h e r s i d e In n e r r i n g f a c es c l a m p e d t o g e t h e r T h e s e I n n e r a nd O u t e r r i n g f a c es a r e f l u sh Cl e a r a n c e b e t w e en In n e r r i ng f a c es DB S t a m p e d f a c es o f O u t e r r i n g s to g e t h e r MountedBefore Mounting In n e r a n d O u t er r i n g f a c es c l a m p e d t o g e t h e r C l e a r a n c e b e t w e en O u t e r r i n g f a c es DF U n s t a m p e d f a c es o f O u t e r r i n gs to g e t h e r MountedBefore Mounting T h e s e I n n e r a n d O u t e r r i n g f a c es n o t f l u sh F a c e s f l u sh o n b o t h s i d es Figure A Figure B Before Mounting Mounted Before Mounting Mounted TU QU Before Mounting Mounted Bearing setting continued Engineering A A146 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A147 A146 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A147 ADVANTAGES OF OIL AND GREASE Oil Grease Carries heat away from the bearings Carries away moisture and particulate matter Easily controlled lubrication Simplifies seal design and acts as a sealant Permits prelubrication of sealed or shielded bearings Generally requires less frequent lubrication Lubricant additives Additives are materials usually chemicals that improve specific properties when added to lubricants Additives when properly formulated into a lubricant can increase lubricant life provide greater resistance to corrosion increase load carrying capacity and enhance other properties Additives are very complex and should not be added indiscriminately to lubricants as a cure all for all lubrication problems The more common lubricant additives include Oxidation inhibitors for increasing lubricant service life Rust or corrosion inhibitors to protect surfaces from rust or corrosion Demulsifiers to promote oil and water separation Viscosity index improvers to decrease viscosity sensitivity to temperature change Pour point depressants to lower the pouring point at low temperatures Lubricity agents to modify friction Antiwear agents to retard wear Extreme pressure EP additives to prevent scoring under boundary lubrication conditions Detergents and dispersants to maintain cleanliness Antifoam agents to reduce foam Tackiness agents to improve adhesive properties Inorganic additives such as molybdenum disulphide graphite and zinc oxide are sometimes included in lubricants In most tapered roller bearing applications inorganic additives are of no significant benefit conversely as long as the concentration is low and the particle size small they are not harmful Recently the effects of lubricant chemistry on bearing life as opposed to the purely physical characteristics have received much emphasis Rust oxidation extreme pressure and anti wear additive packages are widely used in engine and gear oils Fatigue testing has shown these additives may depending on their chemical formulation concentration and operating temperature have a positive or negative impact on bearing life Consult your Timken representative for more information regarding lubricant additives Guidance for oil grease selection Oil lubrication Oils used for bearing lubrication should be high quality non oxidizing mineral oils or synthetic oils with similar properties Selection of the proper type of oils depends on bearing speed load operating temperature and method of lubrication Some features and advantages of oil lubrication in addition to the above are as follows Oil is a better lubricant for high speeds or high temperatures It can be cooled to help reduce bearing temperature With oil it is easier to handle and control the amount of lubricant reaching the bearing It is harder to retain in the bearing Lubricant losses may be higher than with grease As a liquid oil can be introduced to the bearing in many ways such as drip feed wick feed pressurized circulating systems oil bath or air oil mist Each is suited to certain types of applications Oil is easier to keep clean for recirculating systems Oil may be introduced to the bearing housing in many ways Lubrication and Seals Lubrication To help maintain a rolling bearing s anti friction characteristics lubrication is needed to Minimize rolling resistance due to deformation of the rolling elements and raceway under load by separating the mating surfaces Minimize sliding friction occurring between rolling elements raceways and cage Transfer heat with oil lubrication Protect from corrosion and with grease lubrication from contaminant ingress Modern lubricants do this very effectively although in many applications the means by which they accomplish this are extremely complex and not completely understood Because the principles involved with lubricating rolling element bearings are complex and do not have to be known to employ lubricants successfully this discussion will stress the practical rather than the theoretical aspects of lubrication LUBRICATION SELECTION The wide range of bearing types and operating conditions precludes any simple all inclusive statement or guideline allowing the selection of the proper lubricant At the design level the first consideration is whether oil or grease is best for the particular operation The advantages of oil and grease are outlined in the table below When heat must be carried away from the bearing oil must be used It is nearly always preferred for very high speed applications For limiting speeds of grease and oil lubricated bearings refer to the section entitled Speed Heat and Torque section A146 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A147 Engineering A A146 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A147 oil lubrication guidelines Oil lubrication Lubricating oils are commercially available in many forms for automotive industrial aircraft and other uses Oils are classified as either petroleum types refined from crude oil or synthetic types produced by chemical synthesis Petroleum oils Petroleum oils are used for nearly all oil lubricated applications of Timken bearings These oils have physical and chemical properties that can help in the selection of the correct oil for any bearing application Synthetic oils Synthetic oils cover a broad range of categories and include polyalphaolefins silicones polyglycols and various esters In general synthetic oils are less prone to oxidation and can operate at extreme hot or cold temperatures Physical properties such as pressure viscosity coefficients tend to vary between oil types and caution should be used when making oil selections The polyalphaolefins PAO have a hydrocarbon chemistry which parallel petroleum oil both in their chemical structures and pressure viscosity coefficients Therefore PAO oil is mostly used in the oil lubricated applications of Timken bearings when severe temperature environments hot and cold are encountered or when extended lubricant life is required The silicone ester and polyglycol oils have an oxygen based chemistry that is structurally quite different from petroleum oils and PAO oils This difference has a profound effect on its physical properties where pressure viscosity coefficients can be lower compared to mineral and PAO oils This means that these types of synthetic oils may actually generate a smaller EHD film thickness than a mineral or PAO oil of equal viscosity at operating temperature Reductions in bearing fatigue life and increases in bearing wear could result from this reduction of lubricant film thickness Selection of oils The selection of oil viscosity for any bearing application requires consideration of several factors load speed bearing setting type of oil and environmental factors Since viscosity varies inversely with temperature a viscosity value must always be stated with the temperature at which it was determined High viscosity oil is used for low speed or high ambient temperature applications Low viscosity oil is used for high speed or low ambient temperature applications lubrication and seals continued The most common systems are Oil bath The housing is designed to provide a sump through which the rolling elements of the bearing will pass Generally the oil level should be no higher than the center point of the lowest rolling element If speed is high lower oil levels should be used to reduce churning Gages or controlled elevation drains are used to achieve and maintain the proper oil level Circulating system This system has the advantages of An adequate supply of oil for both cooling and lubrication Metered control of the quantity of oil delivered to each bearing Removal of contaminants and moisture from the bearing by flushing action Suitability for multiple bearing installations Large reservoir which reduces deterioration Increased lubricant life provides economical efficiency Incorporation of oil filtering devices Positive control to deliver the lubricant where needed A typical circulating oil system consists of an oil reservoir pump piping and filter A cooler may be required Oil mist lubrication Oil mist lubrication systems are used in high speed continuous operation applications This system permits close control of the amount of lubricant reaching the bearings The oil may be metered atomized by compressed air and mixed with air or it may be picked up from a reservoir using a venturi effect In either case the air is filtered and supplied under sufficient pressure to assure adequate lubrication of the bearings Control of this type of lubrication system is accomplished by monitoring the operating temperatures of the bearings being lubricated The continuous passage of the pressurized air and oil through the labyrinth seals used in the system prevents the entrance of contaminants from the atmosphere to the system The successful operation of this type of system is based upon the following factors proper location of the lubricant entry ports in relation to the bearings being lubricated avoidance of excessive pressure drops across void spaces within the system the proper air pressure and oil quantity ratio to suit the particular application and the adequate exhaust of the air oil mist after lubrication has been accomplished To ensure wetting of the bearings and to prevent possible damage to the rolling elements and races it is imperative that the oil mist system be turned on for several minutes before the equipment is started The importance of wetting the bearing before starting cannot be overstated and has particular significance for equipment that has been idled for extended periods of time Approximate Temperature Limits For Oils Petroleum 149 C 300 F Super Refined Petroleum 177 C 350 F Synthetic Hydrocarbon 204 C 400 F Synthetic Esters 204 C 400 F Silicones 260 C 500 F Polyphenylether 288 C 550 F Perfluorinated 316 C 600 F WARNING Proper maintenance and handling practices are critical Failure to follow installation instructions and to maintain proper lubrication can result in equipment failure creating a risk of serious bodily harm Engineering A A148 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A149 A148 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A149 lubrication and seals continued typical oil lubrication guidelines In this section the properties and characteristics of lubricants for typical tapered roller bearing applications are listed These general characteristics have resulted from long successful performance in these applications General purpose rust and oxidation lubricating oil General purpose rust and oxidation R O inhibited oils are the most common type of industrial lubricant They are used to lubricate Timken bearings in all types of industrial applications where conditions requiring special considerations do not exist Suggested general purpose R O lubricating oil properties Base stock Solvent refined high viscosity index petroleum oil Additives Corrosion and oxidation inhibitors Viscosity index 80 min Pour point 10 C max Viscosity grades ISO ASTM 32 through 220 Some low speed and or high ambient temperature applications require the higher viscosity grades and high speed and or low temperature applications require the lower viscosity grades Industrial extreme pressure EP gear oil Extreme pressure gear oils are used to lubricate Timken bearings in all types of heavily loaded industrial equipment They should be capable of withstanding heavy loads including abnormal shock loads common in heavy duty equipment Suggested industrial EP gear oil properties Base stock Solvent refined high viscosity index petroleum oil Additives Corrosion and oxidation inhibitors Extreme pressure EP additive 15 8 kg 35 lb min OK Timken load rating Viscosity index 80 min Pour point 10 C max Viscosity grades ISO ASTM 100 150 220 320 460 ASTM D 2782 Industrial EP gear oils should be composed of a highly refined petroleum oil based stock plus appropriate inhibitors and additives They should not contain materials that are corrosive or abrasive to bearings The inhibitors should provide long term protection from oxidation and protect the bearing from corrosion in the presence of moisture The oils should resist foaming in service and have good water separation properties An EP additive protects against scoring under boundary lubrication conditions The viscosity grades suggested represent a wide range High temperature and or slow speed applications generally require the higher viscosity grades Low temperatures and or high speeds require the use of lower viscosity grades TEMPERATURE vs Kinematic Viscosity Fig A 31 Viscosity classification comparison between ISO ASTM grades ISO 3448 ASTM D2442 and SAE grades SAE J 300 80 for crankcase oils SAE J 306 81 for axle and manual transmission oils Classification There are several classifications of oils based on viscosity grades The most familiar are the Society of Automotive Engineers SAE classifications for automotive engine and gear oils The American Society for Testing and Materials ASTM and the International Organization for Standardization ISO have adopted standard viscosity grades for industrial fluids Fig A 31 shows the viscosity comparisons of ISO ASTM with SAE classification systems at 40 C 2 000 1 500 1 000 600 800 400 300 200 150 100 80 60 40 30 20 15 10 8 6 4 3 2 10 000 7 500 5 000 4 000 3 000 2 000 1 500 700 500 1 000 400 300 200 150 100 75 60 50 35 33 1 000 680 320 460 220 100 68 32 15 7 5 2 SAE Crankcase Oils ISO ASTM 3 30 10 W min 5 W min 140 40 250 W min 85 W min 80 W min 150 40 50 90 70 W min Kinematic viscosit y mm 2 s Centistokes cSt at 40 C Vi scosit y Saybolt Universal Seconds SUS at 100 F 22 2046 1 500 SAE Gear Oil 10000 1000 100 10 1 0 50 100 150 200 Temperature degrees C Kinematic Viscosity cSt ISO VG 680 460 320 220 150 100 68 46 32 Fig A 31a The figure below can be used to predict the oil s kinematic viscosity versus temperature use base oil for grease A148 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A149 Engineering A A148 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A149 LUBRICATING GREASES Definition According to the ASTM definition lubricating grease is a solid to semi fluid product of the dispersion of a thickening agent in a liquid lubricant other ingredients imparting special properties may be included If this definition were applied in the manner a chemist would use to illustrate a chemical reaction the composition of a grease could be described by the formula below At this time there is no known universal anti friction bearing grease Each individual grease has certain limiting properties and characteristics Synthetic lubricating fluids such as esters organic esters and silicones are used with conventional thickeners or chemical additives to provide greases capable of performing over an extremely wide range of temperatures from as low as 73 C 100 F to a high of 288 C 550 F The successful use of lubricating grease in roller bearings depends on the physical and chemical properties of the lubricant pertaining to the bearing its application installation and general environmental factors Because the choice of a lubricating grease for a particular bearing under certain service conditions is often difficult to make your Timken representative should be consulted for proper suggestions Grease lubrication The simplest lubrication system for any bearing application is grease Conventionally greases used in Timken bearing applications are petroleum oils of some specific viscosity that are thickened to the desired consistency by some form of metallic soap Greases are available in many soap types such as sodium calcium lithium calcium complex and aluminium complex Organic and inorganic type non soap thickeners also are used in some products Soap type Calcium greases have good water resistance Sodium greases generally have good stability and will operate at higher temperatures but they absorb water and cannot be used where moisture is present Lithium calcium complex and aluminium complex greases generally combine the higher temperature properties and stability of sodium grease with the water resistance of calcium grease These greases are often referred to as multi purpose greases since they combine the two most important lubricant advantages into one product Fluids Thickening Special Lubricating Agents Ingredients Grease Mineral Oils Soaps Oxidation Inhibitors Esters Lithium Sodium Rust Inhibitors Organic Barium Calcium VI Improver Esters Strontium Tackiness Glycols Non Soap Inorganic Perfumes Silicones Microgel Clay Dyes Carbon Black Metal Deactivator Silica gel Non Soap Organic Urea compounds Terepthlamate Organic Dyes CHARACTERISTICS AND OPERATING ENVIRONMENTS Listed below are the general characteristics of prominent rolling bearing greases Polyurea as a thickener for lubricating fluids is one of the most significant lubrication developments in more than 30 years Polyurea grease performance in a wide range of bearing applications is outstanding and in a relatively short time it has gained acceptance as a factory packed lubricant for ball bearings Consistency Greases may vary in consistency from semifluids hardly thicker than a viscous oil to solid grades almost as hard as a soft wood Consistency is measured by a penetrometer in which a standard weighted cone is dropped into the grease The distance the cone penetrates measured in tenths of a millimeter in a specific time is the penetration number The National Lubricating Grease Institute N L G I classification of grease consistency is shown below Grease consistency is not fixed it normally becomes softer when sheared or worked In the laboratory this working is accomplished by forcing a perforated plate up and down through a closed container of grease This working does not compare with the violent shearing action that takes place in a ball bearing and does not necessarily correlate with actual performance NLGI Grease Grades Penetration Number 0 355 385 1 310 340 2 265 295 3 220 250 4 175 205 5 130 160 6 85 115 lubrication and seals continued Typical Usable Typical Dropping PT Temperature Water Resistance Thickener C F C F Sodium Soap 260 500 121 250 Poor Lithium Soap 193 380 104 220 Good Polyurea 238 460 149 300 Excellent Lithium Complex Soap 260 500 163 325 Good Continuous operation with no relubrication Depending upon the formulation the service limits may vary The usable limit can be extended significantly with relubrication Engineering A A150 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A151 A150 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A151 Low Temperatures Starting torque in a grease lubricated ball bearing at low temperatures can be critical Some greases may function adequately as long as the bearing is operating but resistance to initial movement is such that the starting torque is excessive In certain smaller machines starting is an impossibility when very cold Under such operating circumstances the greases containing low temperature characteristic oils are generally required If the operating temperature range is wide synthetic fluid greases offer definite advantages Greases are available to provide very low starting and running torque at temperatures as low as 73 C 100 F In certain instances these greases perform better in this respect than oil An important point concerning lubricating greases is that the starting torque is not necessarily a function of the consistency or the channel properties of the grease It appears to be more a function of the individual properties of the particular grease and is difficult to measure Experience alone will indicate whether one grease is superior to another High Temperatures The high temperature limit for modern grease is generally a function of the thermal and oxidation stability of the fluid and the effectiveness of the oxidation inhibitors The graph to the right was prepared using military specification greases to illustrate the thermal limitations of mineral oil ester silicone and fluorinated ether greases The limits as shown apply only to prelubricated bearings or to applications where relubrication is not possible Where provisions have been made for relubrication the temperature limits may be extended provided the interval between cycles is reduced accordingly A rule of thumb developed from years of testing grease lubricated bearings indicates that grease life is halved for every 10 C 18 F increase in temperature For example if a particular grease is providing 2 000 hours of life at 90 C 194 F by raising the temperature to 100 C 212 F reduction in life to approximately 1 000 hours would result On the other hand 4 000 hours could be expected by lowering the temperature to 80 C 176 F It becomes obvious that the reactions started by the normal reaction of lubricant with oxygen increases rapidly at higher temperatures The lubricants undergo a series of chemical reactions that ultimately result in the development of viscous or hard residues that interfere with the operation of the bearing Thermal stability oxidation resistance and temperature limitations must be considered when selecting greases for high temperature applications In non relubricatable applications highly refined mineral oils or chemically stable synthetic fluids are required as the oil component of greases for operation at temperatures above 121 C 250 F Petroleum Ester Ester MoS2 Synthetic Hydrocarbon Silicone Perfluoroalkylpolether Temperature Range 73 C 18 C 38 C 93 C 149 C 204 C 260 C 100 F 0 F 100 F 200 F 300 F 400 F 500 F MIL G 25537 MIL G 23827 MIL G 21164 MIL G 81322 MIL G 25013 MIL G 27617 LUBRICATION GREASE TEMPERATURE RANGES Approximate Temperature Limits For Grease Thickeners Soaps 121 C 250 F Complexes 177 C 350 F Polyureas 177 C 350 F Non soap 260 C 500 F Timken Multi Use Lithium Grease Soap Type Lithium Consistency NLGI No 1 or No 2 Additives Corrosion and oxidation inhibitors Base Oil Petroleum Mineral Base Oil Viscosity at 40 C 145 6 Pour Point 18 C max Color Light Brown lubrication and seals continued A150 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A151 Engineering A A150 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A151 grease Compatibility Chart Best Choice Compatible Borderline incompatible Aluminum Complex Timken Food Safe Barium Complex Calcium Stearate Calcium 12 Hydroxy Calcium Complex Calcium Sulfonate Timken Premium Mill Timken Heavy Duty Moly Clay Non Soap Lithium Stearate Lithium 12 Hydroxy Lithium Complex Polyurea Conventional Polyurea Shear Stable Timken Multi Use Timken All Purpose Timken Premium Synthetic Timken High Speed Timken Pillow Block Al Complex Ba Complex Ca Stearate Ca 12 Hydroxy Ca Complex Ca Sulfonate Clay non Soap Li Stearate Li 12 Hydroxy Li Complex Polyurea Polyurea S S lubrication and seals continued WARNING Mixing grease types can cause the lubricant to become ineffective which can result in equipment failure creating a risk of serious bodily harm Engineering A A152 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A153 A152 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A153 Wet Conditions Water and moisture can be particularly conducive to bearing damage Lubricating greases may provide a measure of protection from this contamination Certain greases the calcium lithium and non soap type for example are highly water resistant However these greases exhibit poor rust preventative characteristics unless properly inhibited Sodium soap greases emulsify with small amounts of moisture that may be present and prevent the moisture from coming in contact with the bearing surfaces In certain applications this characteristic may be advantageous however emulsions are generally considered undesirable Many bearing applications require lubricants with special properties or lubricants formulated specifically for certain environments such as Friction Oxidation Fretting Corrosion Chemical and Solvent Resistance Food Handling Quiet Running Space and or Vacuum Electrical Conductivity For assistance with these or other areas requiring special lubricants consult your Timken representative Contamination Abrasive particles When tapered roller bearings operate in a clean environment the primary cause of damage is the eventual fatigue of the surfaces where rolling contact occurs However when particle contamination enters the bearing system it is likely to cause damage such as bruising which can shorten bearing life When dirt from the environment or metallic wear debris from some component in the application is allowed to contaminate the lubricant wear can become the predominant cause of bearing damage If due to particle contamination of the lubricant bearing wear becomes significant changes will occur to critical bearing dimensions that could adversely affect machine operation Bearings operating in a contaminated lubricant exhibit a higher initial rate of wear than those running in an uncontaminated lubricant But with no further contaminant ingress this wear rate quickly diminishes as the contamination particles are reduced in size as they pass through the bearing contact area during normal operation Life reduction with water contamination 3 2 1 0 1 0 5 10 0100 0 0 50 1 water in the lubricant Relative factor life 0 3 percent water in the lubricant Water Either dissolved or suspended water in lubricating oils can exert a detrimental influence on bearing fatigue life Water can cause bearing etching that also can reduce bearing fatigue life The exact mechanism by which water lowers fatigue life is not fully understood It has been suggested that water enters microcracks in the bearing races that are caused by repeated stress cycles This leads to corrosion and hydrogen embrittlement in the microcracks reducing the time required for these cracks to propagate to an unacceptable size spall Water base fluids such as water glycol and invert emulsions also have shown a reduction in bearing fatigue life Although water from these sources is not the same as contamination the results support the previous discussion concerning water contaminated lubricants The following chart gives a good idea of the influence of water on bearing life Based on Timken Technology tests it was determined that water content of 0 01 percent 100 parts per million or less had no effect on bearing life Greater amounts of water in the oil will reduce bearing life significantly lubrication and seals continued A152 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A153 Engineering A A152 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A153 GREASES APPLICATIONS AND LUBRICATING METHODS Grease lubrication is generally applicable to the following conditions and features low to moderate speed applications within operating temperature limits of the grease Easily confined in the housing This is important in the food textile and chemical industries Bearing enclosure and seal design simplified Improves the efficiency of external mechanical seals to give better protection to the bearing Successfully used for integrally sealed prelubricated ball bearings Advantages of prelubricated ball bearings Prelubricated shielded and sealed bearings are extensively used with much success in applications where Grease might be injurious to other parts of the mechanism Cost and space limitations preclude the use of a grease filled housing Housings cannot be kept free of dirt and grit water or other contaminants Relubrication is impossible or would be a hazard to satisfactory use Prelubricated Timken bearings are prepacked with greases that have chemical and mechanical stability and have demonstrated long life characteristics in rotating bearings Greases are filtered several times to remove all harmful material and accurately metered so that each bearing receives the proper amount of grease GREASE LUBRICATION FOR BEARING HOUSING ASSEMBLIES Polyurea and lithium based greases are normally preferred for general purpose bearing lubrication and are advantageous in high moisture applications Both greases have good water resistant characteristics For temperature ranges of standard greases see chart below The grease must be carefully selected with regard to its consistency at operating temperature It should not exhibit thickening separation of oil acid formation or hardening to any marked degree It should be smooth non fibrous and entirely free from chemically active ingredients Its melting point should be considerably higher than the operating temperature Frictional torque is influenced by the quantity and the quality of lubricant present Excessive quantities of grease cause churning This results in excessive temperatures separation of the grease components and breakdown in lubrication values In normal speed applications the housings should be kept approximately one third to one half full Only on low speed applications may the housing be entirely filled with grease This method of lubrication is a safeguard against the entry of foreign matter where sealing provisions are inadequate for exclusion of contaminants or moisture During periods of non operation it is often wise to completely fill the housings with grease to protect the bearing surfaces Prior to subsequent operation the excess grease should be removed and the proper level restored Applications utilizing grease lubrication should have a grease fitting and a vent at opposite ends of the housing near the top A drain plug should be located near the bottom of the housing to allow purging of the old grease from the bearing Relubricate at regular intervals to prevent damage to the bearing Relubrication intervals are difficult to determine If plant practice or experience with other applications is not available consult your lubricant supplier Note Open type bearings and single shielded types are NOT prelubricated They have a rust preventative coating only and must be lubricated by the customer or end user before operation STANDARD LUBRICATION Timken BALL BEARINGS Bearing Type Grease Type Grease Temperature Range Radial Bearings Double shielded and Polyurea thickener Single and Double Sealed Petroleum oil 30 to 275 F Wide Inner Ring Bearings Polyurea thickener Contact Seal Types Petroleum oil 30 to 275 F Wide Inner Ring Bearings Synthetic thickener Labyrinth Seal Types Synthetic hydrocarbon fluid 65 to 325 F lubrication and seals continued Engineering A A154 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A155 A154 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A155 Multi purpose industrial grease These are typical of greases that can be used to lubricate many Timken bearing applications in all types of standard equipment Special consideration should be given to applications where speed load temperature or environmental conditions are extreme General purpose industrial grease should be a smooth homogeneous and uniform premium quality product composed of petroleum oil a thickener and appropriate inhibitors It should not contain materials that are corrosive or abrasive to tapered roller bearings The grease should have excellent mechanical and chemical stability and should not readily emulsify with water The grease should contain inhibitors to provide long term protection against oxidation in high performance applications and protect the bearings from corrosion in the presence of moisture The suggested base oil viscosity covers a fairly wide range Lower viscosity products should be used in high speed and or lightly loaded applications to minimize heat generation and torque Higher viscosity products should be used in moderate to low speed applications and under heavy loads to maximize lubricant film thickness Mineral grease When conventional mineral greases are used the rib speed should be limited to 5 m s This limit can be increased under pure radial loads up to 13 m s provided that the bearings remain in endplay under all operating conditions Generally No 2 consistency greases are used with medium to low viscosity base oils where fmg factor depending on speed 0 3 fmg 0 5 V free volume of the bearing cm 3 T overall bearing width mm D cup outer diameter mm d cone bore mm M bearing weight kg Vmg fmg x V fmg x x T x D 2 d 2 x 10 3 7 8 x 10 3 cm3 4 M where fsg factor depending on speed 0 15 fsg 0 3 Vsg fsg x V fsg x x T x D 2 d 2 x 10 3 7 8 x 10 3 cm3 4 M Synthetic grease fill The use of low torque greases or synthetic greases can be considered for rib speeds over 2 560 fpm 13 m s up to maximum of 4 920 fpm 25 m s Experience has shown that stabilized temperatures around 15 C to 20 C 60 F to 68 F above ambient can be obtained at the maximum permissible speed The following procedures must be respected to achieve the above performance Very small initial quantity of grease is applied to prevent excessive churning Initial run in period to evacuate unnecessary grease from the bearing Good spindle design to retain grease around the bearings Efficient sealing to protect against external contamination lubrication and seals continued Timken Multi Use Lithium Grease Soap Type Lithium Consistency NLGI No 1 or No 2 Additives Corrosion and oxidation inhibitors Base Oil Petroleum Mineral Base Oil Viscosity at 40 C 145 6 Pour Point 18 C max Color Light Brown A154 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A155 Engineering A A154 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A155 Filling a bearing with synthetic grease When using synthetic greases the limiting factor is the lubrication for life concept without re greasing A normal way to fill the bearing with grease is to do it by hand before heating and fitting the components For the cone the free volume corresponding to the first third of the rollers starting from their large end is filled with grease an additional quantity is provided below the cage For the cup a thin film of grease is spread all around the race Grease lubrication of spindle bearings is generally preferred by machine tool builders over oil circulation lubrication due to its simplicity and low heat generation For high loads or high speeds circulating oil is probably the most widely used method because of its capability to remove heat from the spindle Cooling jets at rib roller end for speed above 25 m s Re greasing cycle The two primary considerations that determine the re greasing cycle on any application are operating temperature and sealing efficiency Obviously seal leakage will dictate frequent relubrication Every attempt should be made to maintain seals at peak efficiency It is generally stated that the higher the temperature the more rapidly the grease oxidizes Grease life is reduced by approximately half for every 10 C rise in temperature The higher the operating temperature the more often the grease must be replenished In most cases experience in the specific application will dictate the frequency of lubrication lubrication and seals continued Engineering A A156 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A157 A156 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A157 Extreme Heat Heavy Loads High Sliding Wear Dirty Environments Slow Speeds Shock Loading Agriculture Mining Cement Plants Construction Off Road Rock Quarry Earth Moving Equipment Fleet Equipment Heavy Industry Pivot Pins Splined Shafts Timken Construction and Off Highway Grease High Speeds Light Loads Moderate Temperatures Moderate Water Alternators Generators Electric Motors Fans Pumps Timken Ball Bearing Electric Motor Grease Environment Corrosive Media Extreme Heat Heavy Loads Wet Conditions Slow to Moderate Speeds Wet and Corrosive Conditions Quiet Environments Light Loads Moderate to High Speeds Moderate Temperatures Application Aluminum Mills Paper Mills Steel Mills Offshore Rigs Power Generation Lightly Loaded Pillow Blocks Idler Pulleys Oven Conveyors Chemical Manufacture Noise Sensitive Applications Timken Mill Grease Timken Ball Bearing Pillow Block Grease Extreme Low and High Temperatures Severe Loads Corrosive Media Slow to Moderate Speeds Wind Energy Main Bearing Pulp and Paper Machines General Heavy Industry Marine Applications Centralized Grease Systems Timken Synthetic Industrial Grease Incidental Food Contact Hot and Cold Temperatures Moderate to High Speeds Medium Loads Food and Beverage Industries Pharmaceuticals Timken Food Safe Grease Ultra High Speeds Extreme Low Temperatures Machine Tools Associated with Grinding Drilling Turning Milling Lathes Timken Ultra High Speed Spindle Grease Moderate Speeds Light to Moderate Loads Moderate Temperatures Moderate Water General Industrial Applications Pins and Bushings Track Rollers Water Pumps Plain and Antifriction Bearings Timken Multi Use Lithium Grease High Wear Moderate Loads Moderate Speeds Moderate Temperatures Agriculture Bushings Ball Joints Truck and Auto Wheel Bearings Heavy Duty Industrial Timken Premium All Purpose Industrial Grease Timken application specific lubricants have been developed by leveraging our knowledge of tribology and anti friction bearings and how these two elements affect overall system performance Timken lubricants help bearings and related components operate effectively in demanding industrial operations High temperature This selection guide is not intended to replace the specifications by the equipment builder anti wear and water resistant additives offer superior protection in challenging environments This chart is intended to provide an overview of the Timken greases available for general applications Contact your local Timken representative for a more detailed publication on Timken lubrication solutions lubrication and seals continued Lubrication selection guide A156 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A157 Engineering A A156 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A157 Non rubbing seals Metal stampings Metal stamping closures are effective in clean applications Where environmental conditions are dirty stampings are used in combination with other closure elements to provide an effective labyrinth against the entry of foreign matter into the bearing chamber The stamping shown in Fig A 32 is effective for applications that are grease lubricated and operate in clean conditions The design illustrated in Fig A 33 uses stampings on both sides of the bearing to keep the grease in close proximity to the bearing The flinger mounted at the outer side of the bearing adds a labyrinth effect Stampings should be designed to provide a clearance of 0 5 to 0 6 mm 0 020 to 0 025 in on diameters between rotating and stationary parts A minimum axial clearance of 3 mm 0 125 in should be provided Machined flingers Machined parts along with other closure elements can be used in place of stampings where closer clearances are desired This results in a more efficient retention of lubricant and exclusion of foreign matter from the bearing housing Examples are shown in Fig A 34 and A 35 An umbrella shaped flinger is shown in Fig A 35 combined with an annular groove closure At high shaft speeds this combination effectively retains oil and keeps out dirt Seals Selecting the right seal When selecting the proper seal design for any Timken bearing application it is necessary to consider the type of lubricant the operation environment the speed of the application and general operating conditions Shaft finish It is important to ensure that no spiral grooves result from machining of shaft surfaces since these will tend to draw lubricant out of or contaminant into the bearing cavity Plunge grinding normally produces a satisfactory surface finish Grease lubrication venting Venting should be provided in the cavity between the two bearings when grease lubrication is used in conjunction with rubbing or non rubbing seals This will prevent an ingress of contamination past the seals in the event of a pressure differential between the bearing cavity and atmosphere Vertical shaft closures oil lubrication Lubricating vertical shaft bearings is a difficult problem Normally grease oil mist or oil air lubrication is used because of the simplicity However some high speed and or heavy load applications will use circulating oil This requires a very good sealing system and a suction pump to remove the oil from the bottom bearing position Fig A 32 Metal stamping Fig A 33 Metal stampings Fig A 34 Machined flinger combined with annular grooves Fig A 35 Machined umbrella flinger combined with annular grooves lubrication and seals continued Engineering A A158 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A159 A158 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A159 70 b a c Clearance dimension a 3 20 4 80 0 125 0 190 dimension b 4 00 4 80 0 160 0 190 dimension c 0 5a diametral clearance 0 25 0 40 for diameters to 0 010 0 016 50 mm 2 in 1 3 max for diameters 0 05 max over 50 mm 2 in Annular grooves Annular groove closures are often used with grease lubrication in place of radial lip seals where considerable grit and dust are encountered The closure usually has several grooves machined in the bore or on the outside diameter depending on the design They become filled with grease which tends to harden and provide a tight closure When used with oil the grooves tend to interrupt the capillary action which would otherwise draw oil out of the bearing cavity Annular grooves with a machined labyrinth effectively protect a grease lubricated bearing when the unit is required to operate in an extremely dirty environment Fig A 36 This type of closure is most effective when applied with close running clearances and the maximum possible number of grooves Suggested dimensions are shown in Fig A 37 Fig A 36 Annular grooves combined with machined labyrinth Fig A 37 Annular grooves Suggested dimensions mm in Rubbing seals Radial lip seals Many types and styles of radial lip seals are commercially available to satisfy different sealing requirements In clean environments where the primary requirement is the retention of lubricant in the bearing housing a single lip seal with the lip pointing inward is often used Where the critical concern is exclusion of contaminants the lip is usually pointed outwards Fig A 38 Fig A 38 Radial lip seals Lip seals are available with or without a spring loaded lip The spring maintains a constant pressure of the lip on the sealing surface thereby providing a more efficient seal for a longer period of time When environmental conditions require a seal to prevent contaminants from entering the bearing chamber as well as retaining the lubricant a double or triple lip seal is often used Additional flingers or shrouds should be used as primary seals where extremely dirty conditions are present so that the seal lip and sealing surface are protected to avoid rapid wear and premature seal damage Fig A 39 Seal wear surfaces are normally required to have a surface finish in the order of 0 25 0 40 m 10 15 in Ra For applications exposed to severe contamination the seal wear surface should in general have a minimum surface hardness of Rockwell C 45 The seal supplier should be consulted for more specific guidance Fig A 39 Lip seal plus machined labyrinth lubrication and seals continued A158 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A159 Engineering A A158 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A159 Fig A 40 DUO FACE PLUS seal Diaphragm seals Diaphragm seals Fig A 41 are commercially available The metallic lip is designed to be spring loaded against the narrow face of the outer race The type shown in Fig A 41b has a second lip which seals against the housing Fig A 41 Diaphragm seal Fig A 41b Diaphragm seal Mechanical face seals These are often used in extremely dirty environments where rotational speeds are low Fig A 42 shows one of the proprietary types of mechanical face seals available This type of seal generally needs to run in an oil bath Designs are also available for high speed and other special applications Fig A 42 Mechanical face seal for low speeds and contaminated environment V ring seals V ring seals can be used in conjunction with grease or oil lubrication As rotational speeds increase the lip tends to pull away from the sealing surface and act like a flinger This seal may be used with either oil or grease lubrication Fig A 43 Consult your V ring seal supplier for application restrictions Fig A 43 V ring seals DUO FACE PLUS seals The DUO FACE PLUS seal Fig A 40 has double lips that seal in the housing bore and the ground surface of the outer race front face This eliminates the need to machine a special seal surface The DUO FACE PLUS seal has proven successful in many different types of grease lubricated applications The range of Timken bearings available with DUO FACE PLUS seals is listed in this book Also a brochure showing application examples is available on request lubrication and seals continued Engineering A A160 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A161 A160 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A161 One Shield Suffix D Two Shields Suffix DD Suffix L Suffix LD Two Mechani Seals Suffix LL W LL Type Typical Mounting BALL BEARINGS WITH SHIELDS AND SEALS Shields D Type Both K and W single row radial types are available with one shield designated by suffix D or two shields suffix DD A shield on one side provides protection against the entrance of coarse dirt or chips and makes it possible to relubricate the bearing from the open side as shown at right Double shielded bearings are prelubricated with the correct amount of Timken suggested ball bearing grease and are designed for applications where relubrication is not required Typical mountings are shown Labyrinth or Mechani Seals L Type Bearings with Mechani Seals are made in the non filling slot type only and are available with a single seal designated by suffix L one seal and one shield suffix LD and two seals suffix LL These bearings have standard bores outside diameters and outer ring widths but the inner ring is wider than standard unshielded and shielded sizes As illustrated in the L and LD Types the inner rings are offset slightly on the side opposite the seal in order to permit clearance when the bearings are mounted in blind housings The Mechani Seal was developed by Timken to provide a frictionless seal for effective grease retention and exclusion of foreign material It consists of two dished steel plates The inner member is fixed securely in the outer ring of the bearing and provides an ample grease chamber plus effective grease retention The outer member is pressed on the outside diameter of the inner ring and rotates as a slinger to throw off contaminants Close running clearances between the inner and outer members assure effective sealing under extremely severe conditions This seal configuration is very effective under high speed because it is virtually frictionless and utilizes slinger action Mechani Seal bearings are very popular in high speed pneumatic tools small electric motors pumps domestic appliances and similar high speed applications A typical mounting arrangement for the LL Type is shown Wide type radial bearings W LL Type with Mechani Seals are designated by the prefix W and suffix LL for two seals They are made in standard bores and outside diameters but in widths the same as those of corresponding size double row bearings The extra width affords greater space for long life factory filtered grease and provides extra support on shafts and in housings so that locknuts and lockwashers are not needed on applications such as electric motors A typical mounting is shown at right lubrication and seals continued A160 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A161 Engineering A A160 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A161 Felt Seals T Type The felt seal consists of two metal plates fixed in the outer ring of the bearing that enclose a felt washer This felt washer which is saturated with oil before assembly in the bearing contacts the ground outside diameter of the inner ring to provide sealing with minimum friction drag Bearings with felt seals are made only in the non filling slot type and are available with one seal designated by the suffix T one seal and one shield identified by suffix TD and two seals suffix TT Bores and outside diameters of these bearings are the same as standard unshielded and shielded types but overall widths are greater As illustrated in the T and TD types the inner rings are offset slightly on the opposite side of the seal to permit clearance when the bearings are mounted in blind housings as illustrated Rubber Seals P Type Radial bearings with rubber seals having one or two seals are designated by the suffixes P and PP respectively With the exception of the extra small sizes they are dimensionally interchangeable with open type and shielded bearings The P Type design is a positive contact seal using a molded synthetic rubber Firmly fixed to the outer ring the seal flares outward and rides on the inner ring The flare out of the seal against the inner ring radius assures constant positive contact to provide an effective barrier against the entrance of contaminants or loss of lubricants Because they interchange dimensionally with standard single row radial types Timken rubber seal bearings provide a convenient compact design Wide type radial rubber seal bearings W PP Type designated by prefix W and suffix PP for two seals are made with standard bores and outside diameters but with widths the same as those as corresponding double row bearings This design also utilizes a molded seal The extra width offers a larger contact area for the shaft and housing and also provides additional space for displacement of grease under agitation These wide type rubber seal bearings are particularly well suited for use by electric motor manufacturers where their advantages have helped simplify design A typical example of motor design simplification is illustrated right Suffix T Suffix TD Suffix PP P Type PP Type Typical Mounting Arrangements Electric Motor Assembly with W PP Type Bearing W PP Type Typical Mounting lubrication and seals continued Engineering A A162 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A163 A162 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A163 Shroud Seal suffix RR Shroud Seal suffix RR Rubber Seals R Type One of the most advanced sealing designs introduced by Timken is the R Type rubber seal bearing This is a positive contact seal of three piece construction utilizing a synthetic rubber seal retained by two steel caps The seal flares outward and rides or wipes on the ground land of the inner ring In this design the rubber sealing element is completely protected by a closely fitting outer cap or shroud which nests tightly against the seal member following its flared out shape at the inner ring of the outside diameter The innermost member is crimped into a groove in the outer ring and encapsulates the seal and outside shroud Providing firm seal contact the back up plate of the seal assembly has a close clearance with the outside diameter of the inner ring preventing the seal from being pushed inward Laboratory tests have clearly established the superior performance of the shroud type R Seal With improved lubricant retention and greater protection against contaminants the shroud design guards the rubber seal against abrasive damage by dirt and fiber wrap which may be prevalent in agriculture and textile applications This seal construction also is available in standard and heavy series wide inner ring bearings Tri Ply Seals Tri Ply Shroud Seal ball bearings are designed for bearing applications involving exceptionally severe contamination or abrasion environments They are produced in many types and sizes both in the radial and wide inner ring designs Each Tri Ply seal consists of a triple lip nitrile seal molded to a heavy metal shroud cap All three seal lips have heavy flare out contact with the inner ring outside diameter and provide exceptionally effective protection against the loss of lubricant and the entrance of wet or abrasive contaminants The shroud cap which nests closely with the outside seal lip helps protect the rubber seal members from wrap and abrasion A feature of these bearings is the balanced design consisting of deep raceways large ball size and extra wide or heavy inner rings The use of Tri Ply bearings simplifies housing designs and their extra inner ring width provides greater support on the shaft These bearings are widely used on conveyors and farm machinery such as disc harrows hillers tomato harvesters cotton harvesters etc Tri Ply Seals lubrication and seals continued A162 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A163 Engineering A A162 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A163 Speed Heat and torque Speed Ratings Radial Ball Bearings There is no precise method for determining the maximum speed at which a ball bearing may operate Bearing characteristics and features of surrounding parts shafts housing and other component as well as basic service conditions are all variables dependent upon each other for continued satisfactory high speed performance The safe operating speed of a bearing is often limited by the temperature within the bearing which in turn is dependent upon the temperature surrounding the application accuracy of bearings shafts housings auxiliary parts etc and the type and amount of lubricant Radial bearings with proper internal refinements will operate at high speeds for long periods if properly installed and lubricated Tolerance grade cage design and lubricant are bearing characteristics which affect speed limitations Bearings with ABEC 1 tolerances are generally satisfactory for normal speeds with grease or oil lubrication Ball bearings with ABEC 5 tolerances or better and ring piloted composition cages lubricated with an efficient non churning cooling oil mist system have exceptional high speed ability In the case of duplex mountings as frequently used in a high speed machine tool spindles bearing preload and contact angle affect the permissible speeds The values in the accompanying table may be used as a general guide for determining the safe maximum speed of standard types of Timken ball bearings To obtain the speed value for any bearing size with inner ring rotating multiply the pitch diameter in millimeters or in the case of extra small inch dimension bearings the nearest millimeter equivalent by the speed in revolutions per minute Refer to page A164 for the most suitable bearing type cage style tolerance guide and type of lubrication For outer ring rotation of ball bearings multiply the speed value pitch or mean dia in mm x RPM of the outer ring by the following factors before referring to the table of speed values Although the speed values shown in the tables on the following page are based on many years of research and accumulated data numerous application of Timken bearings are successfully operating with speed values far in excess of those tabulated Such applications require particular consideration of proper tolerance grade lubrication the effect of centrifugal force on rolling elements and other factors For further information consult your Timken representative Conversely under certain application conditions of load temperature contamination etc limiting speeds may be less than the figures shown These values do not apply to certain special bearings such as radial Tri Ply series square or hex bore bearings Ball Bearing Series Factor Extra small 30 and S and extra light 9100 and M9300 1 3 Light 200 5200 and 7200 1 5 Medium 300 5300 and 7300 1 7 The speed capability of a bearing in any application is subject to a number of factors including Temperature Bearing setting or clearance Lubrication Bearing design The relative importance of each of these factors depends on the nature of the application The effect of each factor is not isolated each contributes in varying degrees depending on the application and overall speed capability of the design An understanding of how each of these factors affects performance as speeds change is required to achieve the speed capabilities inherent in a bearing SPHERICAL AND CYLINDRICaL ROLLER BEARINGS For Timken cylindrical and spherical roller bearings the thermal speed ratings are listed in the bearing tables These values have been determined by balancing the heat generated within the bearing with the heat dissipated from the bearing In calculating these numbers the following assumptions have been made The radial load is five percent of the static load rating For oil it is assumed to be in a bath with the fill to the middle of the lowest rolling element For grease it is assumed a 30 percent bearing cavity fill The oil viscosity is assumed to be 12 cSt ISO VG32 operated at 70 C 158 F and the grease base oil viscosity is assumed to be 22 cSt operated at 70 C 158 F The bearing and its components are at 70 C and the bearing environment is at 20 C 68 F The housing and shaft are steel or cast iron The bearing rotational axis is horizontal The outer ring is stationary and the inner ring is rotating The bearing radial internal clearance complies with class normal and standard fits are used The bearing does not contain seals The bearing does not experience misalignment or axial load The thermal speed ratings are for reference only and can be considerably lower or higher depending on your application Consult your Timken representative for more accurate information regarding a bearing s speed limitations in your application Engineering A A164 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A165 A164 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A165 Note Single or double normal contact P or PP sealed bearings should not exceed 300 000 PDN Consult your Timken representative for limiting speed of RR or Tri Ply sealed bearings Bore O D 2 1 For oil bath lubrication oil level should be maintained covering between 1 3 to 1 2 up from the bottom of the lowest ball RADIAL BALL BEARINGS dm X N VALUES dm IN MILLIMETERS X RPM Bearing Type Series Cage Type ABEC 1 ABEC 3 ABEC 5 and 7 Circulating Grease Oil 1 Grease Oil 1 Grease Grease Oil 1 Oil Mist BALL BEARINGS SINGLE ROW Non Filling Slot Ball Piloted Molded Nylon PRB 250 000 300 000 250 000 300 000 300 000 300 000 300 000 9300K 9100K 200K Pressed Steel Brass 300 000 350 000 300 000 350 000 350 000 400 000 450 000 300K Ring Piloted Molded Reinforced Nylon PRC 350 000 400 000 350 000 450 000 400 000 550 000 650 000 XLS and variations Composition CR Filling Slot Ball Piloted Molded Nylon PRB 250 000 250 000 200W and variations Pressed Steel 250 000 300 000 300W and variations Angular Contact Ball Piloted Pressed Steel Molded Nylon PRB 200 000 300 000 300 000 350 000 7200WN Ring Piloted Brass MBR Ball Piloted Br MBR 300 000 400 000 7300WN Ring Piloted Molded Reinforced Nylon PRC 350 000 400 000 350 000 400 000 Angular Contact Extra precision 2M9300WI 2M200WI 2M300WI 2M9100WI Ring Piloted Composition CR or PRC 350 000 400 000 750 000 1 000 000 1 200 000 2MM9300WI 1 000 000 1 400 000 1 700 000 2MM9100 2MM200WI 2MM300WI DOUBLE ROW 5200 Ball Piloted Molded Nylon PRB Pressed Steel 250 000 300 000 5300 Ball Piloted Brass BR speed heat and torque continued A164 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A165 Engineering A A164 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A165 The usual measure of the speed of a tapered roller bearing is the circumferential velocity at the midpoint of the inner race large end rib Fig A 44 This may be calculated as Rib speed Vr Dmn 60000 m s Dmn 12 ft min where Dm Mean inner race large rib diameter mm in n Bearing speed rev min Fig A 45 is a summary of guidelines relating to speed and temperature based on customer experience customer tests and research conducted by The Timken Company Consult your Timken representative with questions regarding high speed capability The mean large rib diameter at the midpoint of the roller end contact can be scaled from a drawing of the bearing if available or this diameter can be determined by consulting your Timken representative The inner cone mean large rib diameter can be approximated by taking 99 percent of larger rib O D DN values the product of the inner race bore in mm and the speed in rev min are often used as a measure of bearing speed by other bearing manufacturers There is no direct relationship between the rib speed of a tapered roller bearing and DN value because of the wide variation in bearing cross sectional thickness However for rough approximation one meter per second rib speed is about equal to 16 000 DN for average section bearings One foot per minute is equal to approximately 80 DN tapered roller bearings 0 0 10 2 000 100 20 000 200 m s 40 000 ft min 20 4 000 30 6 000 40 8 000 50 10 000 Special high speed bearings with circulating oil Oil jets Oil mist Circulating oil Oil level Grease Inner race rib speed Fig A 45 Speed capability guidelines Typical industry experience indicates no problems under ordinary circumstances Industry experience indicates testing may be required to optimize system Testing will be needed and special bearings may be required to achieve these speeds speed heat and torque continued Fig A 44 Cone rib diameter The inner race rib diameter may be scaled from a print Speed capability guidelines for various types of lubrication systems Inner race rib diameter Engineering A A166 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A167 A166 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A167 OPERATING TEMPERATURES Temperature Limitations Bearing equilibrium temperature is not simply a question of speed It is also dependent on the heat generation rate of all contributing heat sources nature of the heat flow between sources and heat dissipation rate of the system Seals gears clutches and oil supply temperature affect bearing operating temperature Heat dissipation rate is governed by such factors as type of lubrication system materials and masses of the shaft and housing and intimacy of contact with the bearing and surface area and character of the fluid both inside and outside the housing Temperature of the outer surface of the housing is not an accurate indication of bearing temperature The inner ring temperature is often greater than the outer ring temperature and both are usually greater than the outer surface of the housing There are temperature gradients within the bearing with the temperature of the internal parts usually being greater than the outer surfaces Although the temperature of the outer ring O D or the inner ring I D or the oil outlet is often used as an indicator of bearing temperature it should be recognized that these are generally not the highest bearing temperatures During transient conditions such as at startup bearing temperatures will often peak and then reduce to a lower level This is due to the thermal changes taking place between the bearing shaft and housing causing variations in setting and internal loading Also a new bearing will usually generate more heat until it runs in The allowable operating temperature depends on Equipment requirements Lubrication limitations Bearing material limitations Reliability requirements Each factor is an area of increasing concern as operating temperatures rise The equipment designer must decide how operating temperature will affect the performance of the equipment being designed Precision machine tools for example can be very sensitive to thermal expansions In many cases it is important that the temperature rise over ambient be minimized and held to 20 to 25 C 36 to 45 F for some precision spindles Most industrial equipment can operate satisfactorily with considerably higher temperature rises Thermal ratings on gear drives for example are based on 93 C 200 F Some equipment such as plastic calendars and gas turbine engines operate continuously at temperatures well above 100 C 212 F Standard bearing steels cannot maintain the desired minimum hot hardness of 58 HRC much above 135 C 275 F Standard Timken spherical roller bearings are dimensionally stabilized up to 200 C Upon request the bearings can be ordered with dimensional stabilization up to 250 C S2 suffix or 300 C S3 suffix Consult your Timken representative for availability in specific part numbers Standard Timken cylindrical roller bearings are dimensionally stabilized up to 150 C Upon request the bearings can be ordered with dimensional stabilization up to 200 C S1 suffix 250 C S2 suffix or 300 C S3 suffix Dimensional stability of Timken ball bearings is achieved by tempering the hardened steel until any further growth by transformation of austenite to martensite is balanced by shrinkage from tempering martensite This balance is never perfect and some size change will always occur the amount depending upon the operating time and temperature of the bearings and the composition of and heat treatment of the steel The ABMA definition for stabilized rings and balls permits a change of less than 0001 inch per inch after exposure to a temperature of 300 F for 2 500 hours Rings and balls used at elevated temperatures are defined as stable by ABMA where there is a size change of less than 00015 inch per inch after 1 500 hours exposure at temperatures of 450 600 and 800 F Above this special high temperature steels are used by Timken Timken CBS 600 TM steel should be considered for temperatures between 150 to 230 C 300 to 450 F and Timken CBS 1000M TM steel should be used for temperatures above 230 C 450 F Also CBS 600 and CBS 1000M have increased resistance to scoring important in very high speed applications Consult your Timken representative for availability of S1 S2 S3 suffixes or high temperature steels in specific part numbers and applications Although bearings can operate satisfactorily at higher temperatures an upper temperature limit of 80 to 95 C 176 to 203 F is usually more practical for small high volume equipment where prototype testing is possible Higher operating temperatures increase the risk of damage from some unforeseen transient condition If prototype testing is not practical an upper design limit of 80 C 176 F is appropriate unless prior experience on similar equipment suggests otherwise History on some machines operating at higher temperatures such as high speed rolling mills offers good background data for establishing limits on new similar machines Obviously none of the above examples of equipment lubricant or bearing materials limitations are single point limitations but rather areas of gradually increasing concern It is the responsibility of the equipment designer to weigh all relevant factors and make the final determination of what operating temperature is satisfactory for his particular machine Suggested materials for use in rings balls and rollers at various operating temperatures are listed together with data on chemical composition hardness and dimensional stability A temperature of 427 C 800 F is generally the top limit for successful bearing operation using steels Above 427 C 800 F or below where lubricant is not permitted cast or wrought cobalt alloys are generally used Although chosen primarily for their good retention of physical properties they also possess good oxidation resistance at elevated temperatures Suggested materials for cages shields and seals are tabulated on page A168 with their temperature capabilities speed heat and torque continued A166 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A167 Engineering A A166 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A167 Heat generation and dissipation One of the major benefits of oil lubricated systems is that the heat generated by the bearings is carried away by the circulating oil and dissipated through the system Heat generation Under normal operating conditions most of the torque and heat generated by the bearing is due to the elastohydrodynamic losses at the roller race contacts The following equation is used to calculate the heat generated by the bearing Qgen k4n M M k1G1 n 0 62 Peq 0 3 where Qgen generated heat W or Btu min M running torque N m or lbf in n rotational speed RPM G1 geometry factor from bearing data tables viscosity at operating temperature cP Peq equivalent dynamic load N or lbf k1 bearing torque constant 2 56 x 10 6 for M in N m 3 54 x 10 5 for M in lbf in Heat dissipation The heat dissipation rate of a bearing system is affected by many factors The modes of heat transfer need to be considered Major heat transfer modes in most systems are conduction through the housing walls convection at the inside and outside surfaces of the housing and convection by the circulating lubricant In many applications overall heat dissipation can be divided into two categories Heat removed by circulating oil and heat removed through the housing k4 Dimensional factor to calculate heat generation rate k4 0 105 for Qgen in W when M in N m 6 73 x 10 4 for Qgen in Btu min when M in lbf in k5 Dimensional factor to calculate heat carried away by a petroleum oil k 5 28 for Qoil in W when f in L min and in C 0 42 for Qoil in Btu min when f in U S pt min and in F k6 Dimensional factor to calculate heat carried away by a circulating fluid k6 1 67 x 10 5 for Qoil in W 1 67 x 10 2 for Qoil in Btu min Qoil Heat dissipation rate of circulating oil W Btu min i Oil inlet temperature C F o Oil outlet temperature C F Cp Specific heat of lubricant J kg x C Btu lb x F f Lubricant flow rate L min U S pt min Lubricant density kg m 3 lb ft 3 Heat dissipation by circulating oil Heat dissipated by a circulating oil system is Qoil k5 f o i If a circulating lubricant other than petroleum oil is used the heat carried away by that lubricant will be Q oil k6 Cp f o i The following factors apply to the heat generation and dissipation equations listed on this page speed heat and torque continued Other Considerations Until now temperature limitation has been discussed in reference to metallurgical considerations However installations which operate at high temperatures for extended periods may lose the quality of shaft and housing fits Carefully machined and heat treated shafts and housings will minimize trouble from this source In some applications the internal clearance of bearings may be partially absorbed For example during the first few seconds of rotation a massive housing may keep the outer race cooler than the inner race and rolling elements even if the housing is already at some elevated temperature and also during heat soakback when rotation stops heat may flow back to the bearing along the shaft If while stationary the effects of heat soakback more than removes the radial internal clearance radial brinell of the races may occur and the bearing will be rough during subsequent rotation Bearings with extra internal looseness may be required to compensate for the above conditions Engineering A A168 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A169 A168 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A169 These tables provide standard operating temperatures for common bearing component materials They should be used for reference purposes only Other bearing component materials are available on request Contact your Timken representative for further information CAGES Molded 6 6 Nylon PRB Molded 6 6 Fiberglass reinforced Nylon PRC Phenolic Resin Laminate Low Carbon Pressed Steel Pressed Stainless Steel Machined Brass Machined Iron Silicone Machined Steel Shields Low Carbon Steel Stainless Steel Nylon Seals Buna N Polyacrylic Fluoroelastomer Stabilized TFE Fluorocarbon TFE Fluorocarbon with glass fabric 65 F 0 F 100 F 200 F 300 F 400 F 500 F 600 F 700 F 800 F 54 C 17 C 38 C 93 C 149 C 204 C 260 C 316 C 371 C 427 C Limited life above these temperatures OPERATING TEMPERATURES FOR BEARING COMPONENT MATERIALS Cages shields and seals OPERATING TEMPERATURES FOR BEARING COMPONENT MATERIALS RINGS BALLS AND ROLLERS SINGLE ROW Approximate Operating Temperature Chemical Temp Hardness 100 F 65 F 0 F 100 F 200 F 250 F 300 F 400 F 500 F 600 F 700 F 800 F Material Analysis F HRC 73 C 17 C 38 C 93 C 149 C 204 C 260 C 316 C 371 C 427 C Low alloy carbon chromium 1C 70 60 bearing steels 52100 0 5 1 5Cr and others per ASTM A295 0 35Mn Low alloy carbon chromium 1C 70 58 bearing steels 52100 0 5 1 5Cr 350 56 and others per ASTM 0 35Mn 450 54 A295 Deep hardening steels for 1C 1 1 8Cr 70 58 heavy sections per ASTM 450 55 A485 1 1 5 Mn 06Si 600 52 Carburizing steels per 70 58 ASTM A534 a low alloy 4118 2C 5Cr 80Mn 12Mo b 8620 2C 5Cr 80 Mn 20 Mo 55Ni c high nickel 3310 10C 1 60Cr 50Mn 3 50Ni Corrosion Resistant 1C 18Cr 70 58 440C stainless steel per ASTM A756 Corrosion Resistant 1C 18Cr 70 58 440C stainless steel per 450 55 ASTM A756 600 52 M 50 4 Cr 4 Mo 70 60 Medium 1V 0 8C 450 59 High Speed 600 57 Dimensional stability data shown above is the permanent metallurgical growth and or shrinkage only Thermal expansion effects are not included Bearings have been made of special material for operation at temperatures above 800 F Consult your Timken representative regarding the application Note ASTM A295 bearing steels are suitable for many applications up to 250 F but are not as dimensionally stable as they are at temperatures below 212 F STANDARD DIMENSIONAL STABILIZATION 0 0001 in in dimensional change in 2 500 hours at 212 F Good oxidation resistance Heat stabilized per FS136 0001in in dimensional change in 2 500 hours at 300 F When given a stabilizing heat treatment A295 steel is suitable for many applications in the 350 450 F range however it is not as stable dimensionally as it is at temperatures below 350 F If utmost stability is required use materials in the 600 F group below As heat treated and tempered it is stabilized 0001 in in dimensional change in 2500 HR at 300 F 149 C 4118 8620 steel frequently used to achieve extra ductility in inner rings for locking device bearings 3310 and others used for extra thick section rings Excellent corrosion resistance As heat stabilized for maximum hardness at high temperatures FS238 Good oxidation resistance at higher temperatures Note load capacity drops off more rapidly at higher temperatures than M50 shown below which should be considered if loads are high 0001 in in dimensional change in 1 200 hours Recommended where stable high hardness at elevated temperature is required 0001 in in dimensional change in 1 200 hours at 600 F speed heat and torque continued A168 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A169 Engineering A A168 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A169 speed heat and torque continued TORQUE tapered roller bearings Running torque M The rotational resistance of a rolling bearing is dependent on load speed lubrication conditions and bearing internal characteristics The following formulas yield approximations to values of bearing running torque The formulas apply to bearings lubricated by oil For bearings lubricated by grease or oil mist torque is usually lower although for grease lubrication this depends on amount and consistency of the grease The formulas also assume the bearing running torque has stabilized after an initial period referred to as running in Thrust condition Net bearing thrust load 0 47 FrA 0 47 FrB Fae KA KB FaA 0 47 FrB Fae KB FaB 0 47 FrB KB 0 47 FrA 0 47 FrB Fae KA KB FaA 0 47 FrA KA FaB 0 47 FrA Fae KA Bearing A FrA F ae FrB Bearing B F rA Fae FrB Bearing A Bearing B n n Single row tapered roller bearing Design external thrust Fae onto bearing A Bearing A FrA F ae FrB Bearing B F rA Fae FrB Bearing A Bearing B n n NOTE The torque equations will be underestimated if operating speed n is less than nmin For values of f1 and f2 refer to figure A 46 on page A171 M k1 G1 n 0 62 f1 Fr 0 3 K nmin k2 f2 Fr 2 3 G2 K Engineering A A170 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A171 A170 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A171 M 2 k1 G1 n 0 62 0 030 FrC 0 3 K k2 0 890 Fr 2 3 G2 K Double row tapered roller bearing Design external thrust Fae onto bearing A Load condition Radial load on each row Fr Fae 0 47 FrAB KA Bearing B is unloaded FrA FrAB FaA Fae Fae 0 47 FrAB KA FrA FrAB 1 06 K Fae 2 FrB FrAB 1 06 K Fae 2 M k1 G1 n 0 62 0 060 0 3 K FrA 0 3 FrB 0 3 Fixed position F ae BearingA Bearing B F rAB n FrAB Bearing A Bearing B Fae n Bearing C FrC n Floating position speed heat and torque continued Fixed bearing Fixed bearing Floating bearing Fae BearingA Bearing B FrAB n FrAB Bearing A Bearing B F ae n Bearing C FrC n M running torque N m lbf in Fr radial load N lbf G1 geometry factor from bearing data tables G2 geometry factor from bearing data tables K K factor n speed of rotation rev min k1 2 56 x 10 6 metric or 3 54 x 10 5 inch k2 625 metric or 1700 inch lubricant dynamic viscosity at operating temperature centipoise For grease use the base oil viscosity f1 combined load factor see chart on A171 f2 combined load factor see chart on A171 nmin nmin k2 f2 FrAB 2 3 G2 K nminA k2 1 78FrA 2 3 G2 K nminB k2 1 78FrB 2 3 G2 K NOTE The torque equations will be underestimated if operating speed n is less than nmin For values of f1 and f2 refer to figure A 46 on page A171 M k1 G1 n 0 62 f1 FrAB 0 3 K A170 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A171 Engineering A A170 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A171 KFa Fr 0 0 2 0 4 0 6 0 8 1 0 1 2 1 4 1 6 1 8 2 0 2 8 2 6 2 4 2 2 2 0 1 8 1 6 1 4 1 2 1 0 0 8 0 6 0 4 0 2 0 Combined load factors f 1 and f 2 f2 f1 Load condition f1 and f2 KFa Fr 2 0 0 47 KFa Fr 2 0 KFa Fr 0 47 f1 KFa Fr f2 f1 0 8 use graph above f1 0 06 f2 1 78 Fig A 46 speed heat and torque continued Determination of combined load factors f1 and f2 Engineering A A172 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A173 A172 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A173 30 40 50 60 70 80 90 100 110 120 0 C 80 100 120 140 160 180 200 220 240 0 F 1500 1000 680 460 320 220 150 100 68 46 3222 10000 7500 5000 4000 3000 2000 1000 750 500 400 300 200 150 100 80 60 50 40 30 25 20 18 16 14 12 10 9 8 7 6 5 4 5 4 3 5 3 Dynamic viscosity mPa s centipoise cP Temperature Viscosities in mPa s centipoise cP for ISO ASTM industrial fluid lubricant grade designations Assumes Viscosity Index 90 Specific Gravity 0 875 at 40 C ISO ASTM viscosity grade speed heat and torque continued Fig A 47 A172 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A173 Engineering A A172 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A173 needle ROLLER BEARINGS Empirical torque equations for radial and thrust needle bearings were developed by Timken M dm 4 5 x 10 7 v 0 3 n 0 6 0 12Fr 0 4 Testing also showed that full complement radial needle roller bearings operate at 1 5 to 2 times the torque determined for caged radial needle roller bearings Similarly the running torque of thrust needle roller bearings is given M 4 5 x 10 7 v 0 3 n 0 6 dm 0 016Fal In both equations the mean diameter dm is the average of the bore and O D Of the bearings while the length l in the thrust bearing torque equation can be approximated using the bearing s radial section e g l 1 2 Ea Eb Finally note that the viscosity is in units of centistokes while that for tapered roller bearings was in centipoise A typical conversion factor for mineral oil is 1 cSt 0 875 cp Both of the aforementioned equations were determined for circulating oil lubrication systems For grease lubrication the viscosity of the base oil should be used to estimate the running torque Cylindrical and Spherical Roller and Ball Bearings The torque equations for cylindrical and spherical roller bearings are given as follows where the coefficients are based on series and found in the following table M 1 F d m 10 7 0 v n 2 3 d m 3 if v n 2000 1 F d m 160 x 10 7 0 d m 3 if v n 2000 Again note that the viscosity is in units of centistokes The load term F is dependent on bearing type as follows Radial Ball F max 0 9Fa cot 0 1Fr or Fr Radial Cylindrical F max 0 8Fa cot or and Spherical Roller Fr Thrust Ball and Cylindrical F Fa and Spherical Roller Coefficients for the Torque Equation Bearing Type Dimension Series 0 1 18 1 7 0 00010 28 1 7 0 00010 38 1 7 0 00010 19 1 7 0 00015 Single row deep groove ball bearings 39 1 7 0 00015 00 1 7 0 00015 10 1 7 0 00015 02 2 0 00020 03 2 3 0 00020 04 2 3 0 00020 Single row angular contact ball 02 2 0 00025 bearings 22 45 03 3 0 00035 Double row or paired single row 32 5 0 00035 angular contact ball bearings 33 7 0 00035 Gothic Arch ball bearings 02 2 0 00037 03 3 0 00037 Single row cylindrical roller 10 2 0 00020 bearings with cage 02 2 0 00030 22 3 0 00040 03 2 0 00035 23 4 0 00040 04 2 0 00040 18 5 0 00055 Single row cylindrical roller bearings 29 6 0 00055 full complement 30 7 0 00055 22 8 0 00055 23 12 0 00055 39 4 5 0 00017 30 4 5 0 00017 40 6 5 0 00027 31 5 5 0 00027 Spherical Roller Bearings 41 7 0 00049 22 4 0 00019 32 6 0 00036 03 3 5 0 00019 23 4 5 0 00030 Double row cylindrical roller bearings 48 9 0 00055 full complement 49 11 0 00055 50 13 0 00055 Thrust cylindrical roller bearings 11 3 0 00150 12 4 0 00150 92 2 5 0 00023 Thrust spherical roller bearings 93 2 5 0 00023 94 3 0 00030 speed heat and torque continued Engineering A A174 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A175 A174 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A175 conversion tables viscosity conversion table SUS R E cSt Saybolt Redwood Engler Centistokes sec sec deg 35 32 2 1 18 2 7 40 36 2 1 32 4 3 45 40 6 1 46 5 9 50 44 9 1 60 7 4 55 49 1 1 75 8 9 60 53 5 1 88 10 4 65 57 9 2 02 11 8 70 62 3 2 15 13 1 75 67 6 2 31 14 5 80 71 0 2 42 15 8 85 75 1 2 55 17 0 90 79 6 2 68 18 2 95 84 2 2 81 19 4 100 88 4 2 95 20 6 110 97 1 3 21 23 0 120 105 9 3 49 25 0 130 114 8 3 77 27 5 140 123 6 4 04 29 8 150 132 4 4 32 32 1 160 141 1 4 59 34 3 170 150 0 4 88 36 5 180 158 8 5 15 38 8 190 167 5 5 44 41 0 200 176 4 5 72 43 2 220 194 0 6 28 47 5 240 212 6 85 51 9 260 229 7 38 56 5 280 247 7 95 60 5 300 265 8 51 64 9 325 287 9 24 70 3 350 309 9 95 75 8 375 331 10 7 81 2 400 353 11 4 86 8 425 375 12 1 92 0 450 397 12 8 97 4 475 419 13 5 103 500 441 14 2 108 550 485 15 6 119 600 529 17 0 130 650 573 18 5 141 700 617 19 9 152 750 661 21 3 163 800 705 22 7 173 850 749 24 2 184 900 793 25 6 195 950 837 27 0 206 1000 882 28 4 217 1200 1058 34 1 260 1400 1234 39 8 302 1600 1411 45 5 347 1800 1587 51 390 2000 1763 57 433 2500 2204 71 542 3000 2646 85 650 3500 3087 99 758 4000 3526 114 867 4500 3967 128 974 5000 4408 142 1082 5500 4849 156 1150 6000 5290 170 1300 6500 5730 185 1400 7000 6171 199 1510 7500 6612 213 1630 8000 7053 227 1740 8500 7494 242 1850 9000 7934 256 1960 9500 8375 270 2070 10000 8816 284 2200 TO CONVERT FROM TO MULTIPLY BY Acceleration foot second 2 meter second 2 m s 2 0 3048 inch second 2 meter second 2 m s 2 0 0254 Area foot 2 meter 2 m 2 0 09290304 inch 2 meter 2 m 2 0 00064516 inch 2 millimeter 2 mm 2 645 16 yard 2 meter 2 m 2 0 836127 mile 2 U S statute meter 2 m 2 2589988 Bending Moment or Torque dyne centimeter newton meter N m 0 0000001 kilogram force meter newton meter N m 9 806650 pound force inch newton meter N m 0 1129848 pound force foot newton meter N m 1 355818 Energy BTU International Table joule J 1055 056 foot pound force joule J 1 355818 kilowatt hour megajoule MJ 3 6 Force kilogram force newton N 9 806650 kilopound force newton N 9 806650 pound force lbf newton N 4 448222 Length fathom meter m 1 8288 foot meter m 0 3048 inch millimeter mm 25 4 microinch micrometer m 0 0254 micron m millimeter mm 0 0010 mile U S statute meter m 1609 344 yard meter m 0 9144 nautical mile meter m 1852 Mass kilogram force second 2 meter mass kilogram kg 9 806650 kilogram mass kilogram kg 1 0 pound mass Ibm avoirdupois kilogram kg 0 4535924 ton long 2240 Ibm kilogram kg 1016 047 ton short 2000 Ibm kilogram kg 907 1847 tonne kilogram kg 1000 000 Power BTU International Table hour watt W 0 293071 BTU International Table minute watt W 17 58427 horsepower 550 ft lbf s kilowatt kW 0 745700 BTU Thermochemical minute watt W 17 57250 Pressure or Stress Force Area newton meter 2 pascal Pa 1 0000 kilogram force centimeter 2 pascal Pa 98066 50 kilogram force meter 2 pascal Pa 9 806650 kilogram force millimeter 2 pascal Pa 9806650 pound force foot 2 pascal Pa 47 88026 pound force inch 2 psi megapascal MPa 0 006894757 Temperature degree Celsius kelvin k tk tc 273 15 degree Fahrenheit kelvin k k 5 9 tf 459 67 degree Fahrenheit degree Celsius C tc 5 9 tf 32 Velocity foot minute meter second m s 0 00508 foot second meter second m s 0 3048 inch second meter second m s 0 0254 kilometer hour meter second m s 0 27778 mile hour U S statute meter second m s 0 44704 mile hour U S statute kilometer hour km h 1 609344 Volume foot 3 meter 3 m 3 0 02831685 gallon U S liquid liter l 3 785412 liter meter 3 m 3 0 001 inch 3 meter 3 m 3 0 00001638706 inch 3 centimeter 3 cm 3 16 38706 inch 3 millimeter 3 mm 3 16387 06 ounce U S fluid centimeter 3 cm 3 29 57353 yard 3 meter 3 m 3 0 7645549 A174 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A175 Engineering A A174 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG A175 FRACTIONS 1 10 mm 1 100 mm 1 1000 mm mm inches mm inches mm inches 0 1 0 00394 0 01 0 00039 0 0010 000039 0 2 0 00787 0 02 0 00079 0 0020 000079 0 3 0 01181 0 03 0 00118 0 0030 000118 0 4 0 01575 0 04 0 00157 0 0040 000157 0 5 0 01969 0 05 0 00197 0 0050 000197 0 6 0 02362 0 06 0 00236 0 0060 000236 0 7 0 02756 0 07 0 00276 0 0070 000276 0 8 0 03150 0 08 0 00315 0 0080 000315 0 9 0 03543 0 09 0 00354 0 0090 000354 CONVERSION TABLE INCHES MILLIMETERS INCHES TO MILLIMETERS UNITS inches 0 1 2 3 4 5 6 7 8 9 0 0 0000 0 000 25 400 50 800 76 200 101 600 1 27 000 152 400 1 77 800 203 200228 600 1 16 0 0625 1 588 26 988 52 388 77 788 103 188 1 28 588 1 53 988 1 79 388 2 04 788 230 188 1 8 0 1250 3 175 28 575 53 975 79 375 104 775 130 175 1 55 575 180 975 2 06 375 231 775 3 16 0 1875 4 763 30 162 55 562 80 962 106 362 1 31 762 1 57 162 1 82 562 2 07 962 233 362 1 4 0 2500 6 350 31 750 57 150 82 550 107 950 1 33 350 158 750 1 84 150 2 09 550234 950 5 16 0 3125 7 938 33 338 58 738 84 138 109 538 1 34 938 1 60 338 185 735 2 11 138236 538 3 8 0 3750 9 525 34 925 60 325 85 725 111 125 136 525 1 61 925 1 87 325 2 12 725 238 125 7 16 0 4375 11 112 36 512 61 912 87 312 112 712 138 112 163 512 1 88 912 214 312 239 712 1 2 0 5000 12 700 38 100 63 500 88 900 114 300 139 700 1 65 100 1 90 500 2 15 900 241 300 9 16 0 5625 14 288 39 688 65 088 90 488 115 888 141 288 1 66 688 192 088 2 17 488 242 888 5 8 0 6250 15 875 41 275 66 675 92 075 117 475 142 875 1 68 275 1 93 675 2 19 075 244 475 11 16 0 6875 17 462 42 862 68 262 93 662 119 062 144 462 1 69 862 1 95 262 220 662246 062 3 4 0 7500 19 050 44 450 69 850 95 250 120 650 1 46 050 1 71 450 1 96 850 222 250247 650 13 16 0 8125 20 638 46 038 71 438 96 838 122 238 1 47 638 1 73 038 1 98 438 223 838249 238 7 8 0 8750 22 225 47 625 73 025 98 425 123 825 1 49 225 174 625 2 00 025 225 425250 825 15 16 0 9375 23 812 49 212 74 612 100 012 125 412 1 50 812 1 76 212 2 01 612 227 012252 412 inches 10 11 12 13 14 15 0 0 0000254 000 279 400 304 800 330 200 355 600 3 81 000 1 16 0 0625255 588 280 988 306 388 331 788 357 188 3 82 588 1 8 0 1250257 175 282 575 307 975 333 375 358 775 384 175 3 16 0 1875258 762 284 162 309 562 334 962 360 362 3 85 762 1 4 0 2500260 350 285 750 311 150 336 550 361 950 3 87 350 5 16 0 3125261 938 287 338 312 738 338 138 363 538 3 88 938 3 8 0 3750263 525 288 925 314 325 339 725 365 125 3 90 525 7 16 0 4375265 112 290 512 315 912 341 312 366 712 3 92 112 1 2 0 5000266 700 292 100 317 500 342 900 368 300 3 93 700 9 16 0 5625268 288 293 688 319 088 344 488 369 888 395 288 5 8 0 6250269 875 295 275 320 675 346 075 371 475 3 96 875 11 16 0 6875271 462 296 862 322 262 347 662 373 062 3 98 462 3 4 0 7500273 050 298 450 323 850 349 250 374 650 4 00 050 13 16 0 8125274 638 300 038 325 438 350 838 376 238 4 01 638 7 8 0 8750276 225 301 625 327 025 352 425 377 825 4 03 225 15 16 0 9375277 812 303 212 328 612 354 012 379 412 4 04 812 UNITS FRACTIONS inches 10 1 10 1 100 1 1000 1 10000 0 2 54 1 25 4 279 4 2 50 8 304 8 3 76 2 330 2 4 101 6355 6 5 127 3 81 6 152 4406 4 7 177 8431 8 8 203 2457 2 9 228 6482 6 inch mm inches mm inches mm inches mm 0 1 2 54 0 01 0 254 0 0010 0254 0 00010 00254 0 2 5 08 0 02 0 508 0 0020 0508 0 00020 00508 0 3 7 62 0 03 0 762 0 0030 0762 0 00030 00762 0 4 10 16 0 04 1 016 0 0040 1016 0 00040 01016 0 5 12 70 0 05 1 270 0 0050 1270 0 00050 01270 0 6 15 24 0 06 1 524 0 0060 1524 0 00060 01524 0 7 17 78 0 07 1 778 0 0070 1778 0 00070 01778 0 8 20 32 0 08 2 032 0 0080 2032 0 00080 02032 0 9 22 86 0 09 2 286 0 0090 2286 0 00090 02286 MILLIMETERS TO INCHES UNITS mm 10 20 30 40 50 60 70 80 90 0 0 393700 787401 181101 574801 968502 362202 75591 3 14961 3 54331 1 0 039370 433070 826771 220471 614172 007872 401572 79528 3 18898 3 58268 2 0 078740 472440 866141 259841 653542 047242 440942 83465 3 22835 3 62205 3 0 118110 511810 905511 299211 692912 086612 480312 87402 3 267723 66142 4 0 157480 551180 944881 338581 732282 125982 519692 913393 30709 3 70079 5 0 196850 590550 984251 377951 771652 165352 559062 95276 3 34646 3 74016 6 0 236220 629921 023621 417321 711022 204722 598432 99213 3 38583 3 77953 7 0 275590 669291 062991 456691 850392 244092 637803 03150 3 42520 3 81890 8 0 314960 708661 102361 496061 889762 283462 677173 07087 3 46457 3 85827 9 0 354330 748031 141731 535431 929132 322832 716543 11024 3 50394 3 89764 mm 100 2 00 300 0 3 937017 8740211 81100 100 393704 330718 2677212 20470 200 787404 724418 6614212 59840 301 181105 118119 0551212 99210 401 574805 511819 4488213 38580 501 968505 905519 8425213 77950 602 362206 2992110 2362014 17320 702 755916 6929110 6299014 56690 803 149617 0866111 0236014 96060 903 543317 4803111 4173015 35430 B S I Norm No 350 1 inch 25 400 mm A S A Norm No B48 1 DIN 4890 1 mm 1 inches 25 4 exact Conversion tables continued Engineering A A176 TIMKEN PRODUCTS CATALOG TIMKEN PRODUCTS CATALOG APB steel hardness numbers approximate hardness conversion numbers for steel based on rockwell c Source ASTM Brinell Hardness Rockwell Rockwell Superficial Number Hardness Hardness Number 1 0 mm Ball Number Superficial Brale 3 000 kg Load Penetrator Rockwell Diamond Standard Hultgren Tungsten A Scale B Scale D Scale 15 N Scale 30 N Scale 45 N Scale Shore Tensile Rockwell C Scale Pyramid Ball Ball Carbide 60 kg Load 100 kg Load 100 kg 15 kg Load 30 kg Load 45 kg Load Scleroscope Strength C Scale Hardness Hardness Ball Brale 1 16 Dia Brale Hardness approx Hardness Number Number Penetrator Ball Penetrator Number 1000 psi Number Vickers 68 940 85 6 76 9 93 2 84 4 75 4 97 68 67 900 85 76 1 92 9 83 6 74 2 95 67 66 865 84 5 75 4 92 5 82 8 73 3 92 66 65 832 739 83 9 74 5 92 2 81 9 72 91 65 64 800 722 83 4 73 8 91 8 81 1 71 88 64 63 772 705 82 8 73 91 4 80 1 69 9 87 63 62 746 688 82 3 72 2 91 1 79 3 68 8 85 62 61 720 670 81 8 71 5 90 7 78 4 67 7 83 61 60 697 613 654 81 2 70 7 90 2 77 5 66 6 81 60 59 674 599 634 80 7 69 9 89 8 76 6 65 5 80 326 59 58 653 587 615 80 1 69 2 89 3 75 7 64 3 78 315 58 57 633 575 595 79 6 68 5 88 9 74 8 63 2 76 305 57 56 613 561 577 79 67 7 88 3 73 9 62 75 295 56 55 595 546 560 78 5 66 9 87 9 73 60 9 74 287 55 54 577 534 543 78 66 1 87 4 72 59 8 72 278 54 53 560 519 525 77 4 65 4 86 9 71 2 58 6 71 269 53 52 544 500 508 512 76 8 64 6 86 4 70 2 57 4 69 262 52 51 528 487 494 496 76 3 63 8 85 9 69 4 56 1 68 253 51 50 513 475 481 481 75 9 63 1 85 5 68 5 55 67 245 50 49 498 464 469 469 75 2 62 1 85 67 6 53 8 66 239 49 48 484 451 455 455 74 7 61 4 84 5 66 7 52 5 64 232 48 47 471 442 443 443 74 1 60 8 83 9 65 8 51 4 63 225 47 46 458 432 432 432 73 6 60 83 5 64 8 50 3 62 219 46 45 446 421 421 421 73 1 59 2 83 64 49 60 212 45 44 434 409 409 409 72 5 58 5 82 5 63 1 47 8 58 206 44 43 423 400 400 400 72 57 7 82 62 2 46 7 57 201 43 42 412 390 390 390 71 5 56 9 81 5 61 3 45 5 56 196 42 41 402 381 381 381 70 9 56 2 80 9 60 4 44 3 55 191 41 40 392 371 371 371 70 4 55 4 80 4 59 5 43 1 54 186 40 39 382 362 362 362 69 9 54 6 79 9 58 6 41 9 52 181 39 38 372 353 353 353 69 4 53 8 79 4 57 7 40 8 51 176 38 37 363 344 344 344 68 9 53 1 78 8 56 8 39 6 50 172 37 36 354 336 336 336 68 4 109 52 3 78 3 55 9 38 4 49 168 36 35 345 327 327 327 67 9 108 5 51 5 77 7 55 37 2 48 163 35 34 336 319 319 319 67 4 108 50 8 77 2 54 2 36 1 47 159 34 33 327 311 311 311 66 8 107 5 50 76 6 53 3 34 9 46 154 33 32 318 301 301 301 66 3 107 49 2 76 1 52 1 33 7 44 150 32 31 310 294 294 294 65 8 106 48 4 75 6 51 3 32 5 43 146 31 30 302 286 286 286 65 3 105 5 47 7 75 50 4 31 3 42 142 30 29 294 279 279 279 64 7 104 5 47 74 5 49 5 30 1 41 138 29 28 286 271 271 271 64 3 104 46 1 73 9 48 6 28 9 41 134 28 27 279 264 264 264 63 8 103 45 2 73 3 47 7 27 8 40 131 27 26 272 258 258 258 63 3 102 5 44 6 72 8 46 8 26 7 38 127 26 25 266 253 253 253 62 8 101 5 43 8 72 2 45 9 25 5 38 124 25 24 260 247 247 247 62 4 101 43 1 71 6 45 24 3 37 121 24 23 254 243 243 243 62 100 42 1 71 44 23 1 36 118 23 22 248 237 237 237 61 5 99 41 6 70 5 43 2 22 35 115 22 21 243 231 231 231 61 98 5 40 9 69 9 42 3 20 7 35 113 21 20 238 226 226 226 60 5 97 8 40 1 69 4 41 5 19 6 34 110 20 Conversion tables continued
