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TIMKENOVERVIEWMost bearingtypes are typicallyshipped protectedwith a corrosionpreventive compoundthat is not a lubricant.Such bearings may beused in oil-lubricatedapplications without removalof the corrosion-preventivecompound. When using somespecialized grease lubrications, itis advisable to remove the corrosionpreventive compound before packing thebearings with suitable grease.Some bearing types in this catalog are pre-packed withgeneral purpose grease suitable for their normal application.Frequent replenishment of the grease may be necessary foroptimum performance. Care must be exercised in lubricantselection, however, since different lubricants are oftenincompatible.When specified by the customer, other bearings may beordered pre-lubricated.Upon receipt of a bearing shipment, ensure that the bearingsare not removed from their packaging until they are readyfor mounting so that they do not become corroded orcontaminated. Bearings should be stored in an appropriateatmosphere in order that they remain protected for theintended period.Any questions concerning shelf life or storage should bedirected to your local sales office.WARNINGFailure to observe the following warnings couldcreate a risk of death or serious injury.Never spin a bearing with compressed air. The componentsmay be forcefully expelled.Proper maintenance and handling practices are critical.Always follow installation instructions and maintainproper lubrication.Any warnings for this product line will be posted onwww.timken.com/warnings.TIMKEN SPHERICAL ROLLER BEARING CATALOG7

SPHERICAL ROLLER BEARING INTRODUCTIONTimken high-quality bearings can be put to work in any application wherespherical roller bearings can be specified. Some of these applications are:8TIMKEN SPHERICAL ROLLER BEARING CATALOG

SPHERICAL ROLLER BEARING INTRODUCTIONTIMKEN SPHERICAL ROLLER BEARINGS – OFFERING SELECTION ANDSUPERIOR PERFORMANCEYour success depends on the performance of your equipment,especially when it faces harsh environments and high radialloads. To help keep uptime high and downtime low, turn to Timken spherical roller bearings. These bearings are your best choicewhen conditions include heavy loads, when you have difficultiesin establishing or maintaining housing alignment, or when shaftdeflection can be expected.PRODUCT OFFERINGOur spherical roller bearing product line is one of the broadestin the industry. Timken spherical bearings are available in eitherstamped-steel window-type cages or precision-machined-brasscages with a wide variety of sizes and configurations to meet therequirements of demanding applications.You can select product from the complete range of our sphericalroller series as depicted in fig. 1. They are available in 10dimensional series conforming to ISO and ANSI/ABMA standards.Our product line includes several designs developed to meet yourapplications’ requirements. Sizes range from 25 mm (0.9842 in.)to 1500 mm bore (59.0551 in.).A QUANTUM LEAPTimken has redesigned the spherical roller bearing line, givingyou expanded options for meeting the toughest, most demandingapplications – from heavy-gear and caster applications to theharshest aggregate and conveyor systems. With higher load andspeed ratings than previous Timken spherical roller bearings,this next generation achieves higher performance levels withimproved surface finishes and innovative features that aredesigned to help lower operating temperatures and increaseload-carrying capabilities.New cage designs, including a nitrided, stamped steelslotted cage, help provide better purging of contaminants.Optimized internal geometries provide positive axial rollerguidance and improved lubricant distribution.Circumferential roller guidance generates positivehydrodynamic contact, contributing to better roller/cageinteraction. The result of these innovations is an 18 percent increase incapacity for a 75 percent calculated design life improvementover our previous spherical roller bearing design.Timken’s offering includes pillow blocks equipped with sphericalroller bearings. These pillow blocks are made of split constructionfor convenient assembly and disassembly.A wide range of accessories is available to support installationand removal needs. Use of accessories is the safest and mosteffective way to mount and dismount a bearing assembly.Updates are made periodically to this catalog. Visitwww.timken.com for the most recent version of the SphericalRoller Bearing Catalog.SERIES239230240231241222232213223233Fig. 1. Radial spherical roller bearing series.TIMKEN SPHERICAL ROLLER BEARING CATALOG9

SPHERICAL ROLLER BEARING INTRODUCTIONTIMKEN SPHERICAL ROLLER BEARINGS – OFFERING SELECTION ANDSUPERIOR PERFORMANCE – continuedQUALITY SOLUTIONSLower operating temperatures increase bearing life by increasinglubricant life. A 5 C decrease in operating temperature cantranslate to 9 percent longer bearing life. In tests, Timkenspherical roller bearings ran at consistently lower temperaturesthan same-size competitive bearings.As the only premium bearing manufacturer to also make superclean, high-alloy bearing steels, we understand the critical qualitylink between materials and product performance.Average Bearing O.D. TemperatureCOOLER THAN THE COMPETITION100 C(212 F)95 C(203 F)90 C(194 F)85 C(185 F)80 C(176 F)75 C(167 F)94 C(201.7 F)91 C(195.8 F)89 C(192.7 F)86 C(186.4 F)TimkenCompetitor ACompetitor BCompetitor CManufacturerFig. 2. Actual average bearing O.D. temperature comparison:22322 spherical roller bearingsINDUSTRY-LEADING THERMAL SPEEDRATINGSThe design of the next-generation Timken spherical roller bearinghas placed its performance among the industry leaders with a17 percent increase in average thermal speed rating over theprevious Timken product.10TIMKEN SPHERICAL ROLLER BEARING CATALOGWe also strictly adhere to the Timken Quality ManagementSystem in every plant worldwide, so each bearing product meetsthe same high performance standards – no matter where in theworld it is manufactured.DEPENDABLE SERVICEEvery Timken spherical roller bearing is backed by the knowledgeof our industry-leading experts. They stand ready to assistyou with product design, application knowledge and 24/7 fieldengineering support – anything you need to help improve uptimeand maximize equipment performance.This catalog includes radial spherical roller bearings, housedunits that use standard width spherical roller bearings andaccessories. Timken’s complete catalog of housed units (orderno. 10475) is available on www.timken.com.

ENGINEERINGENGINEERINGThe following topics are covered within this engineering section:Spherical roller bearing design types.Cage design types.Fitting practice and mounting recommendations.Lubrication recommendations. This engineering section is not intended to becomprehensive, but does serve as a useful guidein spherical roller bearing selection.To view the complete engineering catalog, pleasevisit www.timken.com. To order the catalog,please contact your Timken engineer and requesta copy of the Timken Engineering Manual, ordernumber 10424.TIMKEN SPHERICAL ROLLER BEARING CATALOG11

ENGINEERINGBEARING TYPES AND CAGESRADIAL SPHERICAL ROLLER BEARING TYPES AND CAGESThe principle styles of radial spherical roller bearings that Timkenoffers are: 600 mm outer diameter: EJ, EM and EMB 600 mm outer diameter: YMB, YMD and YPOPTIONAL FEATURES AVAILABLE WITHTIMKEN SPHERICAL ROLLER BEARINGSAbove suffixes correspond to different types of designs dependingon a bearing size and geometry. Main differences are the cagetype used in the assembly. Spherical roller bearings with an EJcage suffix are fitted with a stamped-steel cage. YM/EM/YMB andYMD suffixes are used with brass cage designs. YP is a pin-typecage specific for large diameter bearings.A lubrication groove and three oil holes are provided in thebearing outer ring as standard. This is designated by the W33suffix. It eliminates the expense of machining a channel in thehousing bore for introducing lubricant to the bearing. This designfeature allows the lubricant to flow between the roller paths,through a single lubrication fitting. The lubricant moves laterallyoutward from the center of the bearing, reaching all contactsurfaces and flushing the bearing. To order, add the suffix W33to the bearing number (e.g. 22216EMW33). The newly redesigned Timken EJ, EM and EMB bearings offerhigher load ratings, increased thermal speed ratings and reducedoperating temperatures compared to the previous offering.In addition to these improvements, cage designs vary betweenthe different styles as noted below. See the cage section formore details.StyleCage DesignEJLand-riding steel cage; one per rowEM/YMRoller-riding one-piece brass cageEMB/YMBLand-riding one-piece brass cageYMDLand-riding two-piece brass cageYPSteel pin-type cageMost Timken spherical roller bearings are available with acylindrical bore as well as a tapered bore. Tapered bore bearingpart numbers are designated with a K suffix.A taper of 1:12 is standard except for 240, 241 and 242 series,which have a taper of 1:30.W33 lubrication groove and oil holesBearings for vibratory applicationsTimken offers specific spherical roller bearing designs forvibratory applications. They are designated by the W800modification code and made to a C4 clearance. Specify W800when ordering. This design provides:A lubrication groove on the outer ring with three lubricationholes to facilitate bearing lubrication.Extra-close running accuracy (P5) with high and low pointsmarked on the bearing.Reduced bore and outside diameter tolerances.Radial internal clearance is made in upper two-thirds ofC4 clearance range. These bearings are available with either a cylindrical or taperedbore. Other optional features are available. See page 61, table 27or consult with your Timken engineer.CAGESEJYMDEM/YM and EMB/YMBYPFig. 3. Radial spherical roller bearings.12TIMKEN SPHERICAL ROLLER BEARING CATALOGCages (also referred to as rolling element retainers) serve severalpurposes in the proper operation of a rolling element bearing.Cages separate the rolling elements and prevent rolling elementon rolling element contact and wear. Cages align the rollingelements on the inner ring to prevent rolling element sliding,skidding, and skewing to facilitate true rolling motion. For handlingpurposes, cages retain the rolling elements on the inner ringassembly to allow for bearing installation. In some instances,cages also improve flow of the lubricant to the bearing racewayor rib contacting surfaces.The following sections discuss the common types of cagesused for each major bearing design type (tapered, cylindrical,spherical, and ball bearing). The basic design geometry, material,and manufacture are discussed for each cage type.

ENGINEERINGBEARING TYPES AND CAGESSTAMPED-STEEL CAGESThe redesigned Timken EJ bearings incorporate a uniquestamped-steel cage design.The EJ design includes two independent cages, one for eachrow of rollers, which are assembled into an individual bearing.This feature serves to prevent cage bending when the operatingenvironment is favorable for this to occur.This cage is guided on the inner ring and runs above pitch. Eachcage is surface hardened (nitrided) to provide improved wearresistance as well as additional strength to allow the bearing tooperate in even the most severe environment. Face slots have beendesigned for improved lubrication flow. This can result in a loweroperating temperature and longer bearing life.Fig. 7. One-piece, machinedbrass, roller-riding,finger-type cage.Fig. 8. One-piece, machinedbrass, land-riding,finger-type cage.Fig. 9. Split, machined-brass,land-riding, finger-type cage.Fig. 4. EJ bearings.Fig. 5. EJ cage.MACHINED-BRASS CAGEPIN-TYPE CAGESEM, EMB, YM, YMB and YMD bearing cages are precision- machinedfrom brass as shown in figs. 7-9. Their rugged construction providesan advantage in more severe applications. The open-end, fingertype design permits lubricant to reach all surfaces easily, ensuringample lubrication and a cooler running bearing.Large diameter spherical roller bearings can be supplied withthese cages. Pin-type cages, one for each row of rollers, consistof two rings and a series of pins running through the center ofthe rolling element. The design of pin-type cages permits anincreased roller complement, giving the bearing enhanced loadcarrying ability. Consult your Timken engineer for suggestions onthe application of this cage.EM, EMB, YM and YMB are all one-piece designs that aredifferentiated by their means of guidance within the bearing. WithEM and YM designs, the cage mass is low and the rollers are usedfor guidance, while EMB and YMB cage designs typically havemore mass and guide on the inner ring.YMD cages are similar to YMB, except they have a two-piecedesign. Two independent cages, one for each row of rollers, areassembled into an individual bearing. This allows each row ofrollers to rotate independently when required by the application,and prevents bending of the cage fingers.YM/EMYMB/EMBFig. 10. Pin-type cage.YMDFig. 6. Machined cages.TIMKEN SPHERICAL ROLLER BEARING CATALOG13

ENGINEERINGMETRIC SYSTEM TOLERANCESMETRIC SYSTEM TOLERANCESSPHERICAL ROLLER BEARINGSSpherical roller bearings are manufactured to a number ofspecifications, with each having classes that define toleranceson dimensions such as bore, O.D., width and runout. Metricbearings have been manufactured to corresponding standardnegative tolerances.Boundary dimension tolerances for spherical roller bearingusage are listed in the following tables. These tolerances areprovided for use in selecting bearings for general applications,in conjunction with the bearing mounting and fitting practicesoffered in later sections.The following table summarizes the different specifications andclasses for spherical roller bearings and other available Timkenbearing lines. For the purposes of this catalog, ISO specificationsare shown for spherical roller bearings.TABLE 1. BEARING SPECIFICATIONS AND CLASSES14SystemSpecificationBearing TypeMetricISO/DINAll Bearing TypesP0P6P5P4P2–-ImperialABMASphericalRBEC 1RBEC 3RBEC 5RBEC 7RBEC 9–-TIMKEN SPHERICAL ROLLER BEARING CATALOGStandard Bearing ClassPrecision Bearing Class

ENGINEERINGMETRIC SYSTEM TOLERANCESThe term deviation is defined as the difference between a singlering dimension and the nominal dimension. For metric tolerances,the nominal dimension is at a 0 mm (0 in.) tolerance. The deviationis the tolerance range for the listed parameter. Variation is definedas the difference between the largest and smallest measurementsof a given parameter for an individual ring.Standard Timken radial spherical roller bearings maintainnormal tolerances according to ISO 492. Tables 2 and 3 list thecritical tolerances for these bearing types. For applicationswhere running tolerance is critical, P6 or P5 tolerances arerecommended.TABLE 2. SPHERICAL ROLLER BEARING TOLERANCES – INNER RING (METRIC)(1)Bore Deviation(2)ΔdmpBearing BoreWidth VariationVBSFaceRunoutwith BoreSdRadial RunoutKiaAxial Width Deviation InnerRunout& Outer Rings(2)SiaΔBs and ΔCsOverIncl.P0P6P5P0P6P5P0P6P5P5P5P0, 0-0.0295––(1)Symbol definitions are found on pages 32-33 of the Timken Engineering Manual (order number 10424).Tolerance range is from 0 to value listed.(2)TIMKEN SPHERICAL ROLLER BEARING CATALOG15

ENGINEERINGMETRIC SYSTEM TOLERANCESTABLE 3. SPHERICAL ROLLER BEARING TOLERANCES – OUTER RING (METRIC)(1)Outside Deviation(2)ΔDmpBearing O.D.Width VariationVCSAxialRunoutSeaRadial RunoutKeaOutsideDiameterRunoutWith .00030.0080.000

TIMKEN SPHERICAL ROLLER BEARING CATALOG Price: USD 75 TIMKEN SPHERICAL ROLLER BEARING CATALOG Bearings Steel Power Transmission Systems Precision Components Gears Seals Lubrication Industrial Services Remanufacture and Repair www.timken.com 30M 10-11: Order No. 10446