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TIMKEN MACHINE TOOL CATALOGThe Quick Change Program can perform cost-effectivemodifications and minor rework procedures to your machinetool bearings to extend operational and applicationflexibility.Engineered Surfaces improve wear and fatigue resistancefor bearings and other components through a variety ofapplied treatments and finishes.Condition Monitoring Products and Services are availablein an expanding offering that enables you to stay on top ofmachine performance, and quicklydetect potential problems.As a Timken customer, you receive an uncompromising standard ofquality across the broadest range of bearings and related products.Brands like Timken and Fafnir reflect an extensive line of tapered,spherical, cylindrical, ball bearings and mounted units ideal forvirtually every machine tool and industrial application. Our coreproducts are complemented by an ever-growing2line of friction management solutions includinglubricants, single-point lubricators, maintenancetools, safety equipment, condition monitoringsystems and repair services that help keepoperations running smoothly.Ultra-High Speed Spindle Grease, part of Timken’s2broad lubricant line, is specifically designed for theprecision and high-speed bearings typically usedin machine tools.26TIMKEN MACHINE TOOL CATALOG

IntroductionABOUT THIS CATALOGTimken offers an extensive range of bearings and accessories inboth imperial and metric sizes. For your convenience, size rangesare indicated both in millimeters and inches. Contact your Timkensales representative to learn more about our complete line for thespecial needs of your application.USING THIS CATALOGWe are committed to providing our customers with maximumservice and quality. This catalog contains dimensions, tolerancesand load ratings, as well as an engineering section describing fittingpractices for shafts and housings, internal clearances, materials,and other bearing features. It can provide valuable assistance in theinitial consideration of the type and characteristics of the bearingthat may best suit your particular needs.CATALOG FEATURESDimension and load rating data within the various types and stylesof bearings is organized by size.ISO, DIN, and ABMA, as used in this catalog, refer to the InternationalOrganization for Standardization, Deutsches Institut für Normung EVand the American Bearing Manufacturers Association.SPECIAL APPLICATIONSSome products, such as for aerospace applications, are made tospecial standards, and only the original equipment manufacturercan determine if a particular bearing is suitable for use in theirequipment.NOTEProduct performance is affected by many factors beyond the controlof Timken. Therefore, the suitability and feasibility of all designsand product selection should be validated by you. This catalog isprovided solely to give you, a customer of Timken or its parent oraffiliates, analysis tools and data to assist you in your design.No warranty, expressed or implied, including any warranty ofmerchantability or fitness for a particular purpose, is made byTimken. Timken products are sold subject to a Limited Warranty.TIMKEN MACHINE TOOL CATALOG7

TIMKEN MACHINE TOOL CATALOGPPURCHASER’SEXCLUSIVE REMEDY/SELLER’S EXPRESS LIMIT OF LIABILITYLIMITED WARRANTY2We warrant for a period of one year (unless a shorter period appliesto a particular product) from the date of shipment that our productsshall be free of defects in material and workmanship, as shall bedetermined by our manufacturing standards, and shall conform tothe description on the face of our quotation or this acknowledgment.THE WARRANTY DESCRIBED HEREIN SHALL BE IN LIEU OF ANYOTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOTLIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY ORFITNESS FOR A PARTICULAR PURPOSE. The terms contained hereinconstitute the entire agreement of the parties and the warrantyrepresentations of the seller. There are no other representations,warranties, or guarantees applicable to the sale of our productsunless otherwise expressly agreed to by us in writing.2Purchaser’s exclusive remedy for any warrantyclaim, or for any claim arising out of thepurchase or use of our products, shall bethe replacement of said products. We willreplace our products, without charge to thepurchaser, f.o.b. our point of shipment. We willnot be liable for any consequential, incidental,or other damages sustained by purchaser,including but not limited to, loss of profits orinrevenue, loss of use of product, cost of capital, costrevsubstituted product, facilities, services, or claims ofof subpurchaser’s customers for any damages. Any warrantypurchasmust be made within one year of theclaim of purchaserpushipment of the product. This exclusive remedy appliesdate of shipmenregardless of the nature of purchaser’s claim, whether in contract,tort, express or implied warranty, negligence or strict liability, uponwhich damages are claimed and regardless of whether the same isdue to our negligence or any defect in our product.TERMS AND CONDITIONS OF SALEAll products described in this catalog are sold subject to Timken’sTerms and Conditions of Sale.It is understood that the buyer, in selecting and ordering from thiscatalog, which supersedes all previous editions, accepts all Termsand Conditions of Sale, a copy of which may be obtained from yourTimken sales office. Timken objects to any additional or differentterms.WARNINGFailure to observe the following warnings couldcreate a risk of serious injury.Proper maintenance and handling practices are critical.Always follow installation instructions andmaintain proper lubrication.2Never spin a bearing with compressed air.The rolling elements may be forcefully expelled.NOTEEvery reasonable effort has been made to ensure the accuracyof the information contained in this catalog, but no liability isaccepted for errors, omissions or for any other reason.8TIMKEN MACHINE TOOL CATALOG

IntroductionSHELF LIFE AND STORAGE OFGREASE-LUBRICATED BEARINGS ANDCOMPONENTSTimken guidelines for the shelf life of grease-lubricated rollingbearings, components and assemblies are set forth below. Shelflife information is based on test data and experience. Shelf lifeshould be distinguished from lubricated bearing/component servicelife as follows:SHELF LIFEShelf life of the grease-lubricated bearing/component representsthe period of time prior to use or installation. The shelf life is a portionof the anticipated aggregate service life.It is impossible to accurately predict service life due to variations inlubricant bleed rates, oil migration, operating conditions, installationconditions, temperature, humidity and extended storage. Timkencannot anticipate the performance of the grease lubricant after thebearing or component is installed or placed in service.The bearing shelf life is related primarily to the lubricant’s abilityto maintain the bearing’s original manufactured radial internalclearance and freedom to rotate.The component shelf life is related to the ability of the componentto function as originally intended.Shelf life values, available from Timken, represent a maximumlimit and assume adherence to the Timken suggested storage andhandling guidelines. Deviations from Timken’s storage and handlingguidelines may reduce shelf life. Any specification or operatingpractice that defines a shorter shelf life should be used.STORAGETimken suggests the following storage guidelines for its finishedproducts (bearings, components, and assemblies, hereinafterreferred to as “Products”): Unless directed otherwise by Timken, Products should be keptin their original packaging until they are ready to be placedinto service. Do not remove or alter any labels or stencil markings on thepackaging. Products should be stored in such a way that the packaging isnot pierced, crushed or otherwise damaged. After a Product is removed from its packaging, it should beplaced into service as soon as possible. When removing a Product that is not individually packagedfrom a bulk pack container, the container should be resealedimmediately after the Product is removed. Do not use Product that has exceeded its shelf life as definedin Timken’s shelf life guidelines statement. The storage area temperature should be maintained between0º C (32º F) and 40º C (104º F); temperature fluctuations shouldbe minimized. The relative humidity should be maintained below 60 percent. The storage area should be isolated from undue vibration.The storage area should be kept free from airbornecontaminants such as, but not limited to: dust, dirt, harmfulvapors, etc.Extreme conditions of any kind should be avoided.TIMKEN DISCLAIMS RESPONSIBILITY FOR THE SHELF LIFE OF ANYBEARING/COMPONENT LUBRICATED BY ANOTHER PARTY.TIMKEN MACHINE TOOL CATALOG9

TIMKEN MACHINE TOOL CATALOGInasmuch as Timken is not familiar with a customer’s particularstorage conditions, these guidelines are strongly suggested.However, the customer may very well be required by circumstanceor applicable government requirements to adhere to stricter storagerequirements.Most bearing types are typically shipped protected with a corrosionpreventive compound that is not a lubricant. Such bearings maybe used in oil-lubricated applications without removal of thecorrosion-preventive compound. When using some specializedgrease lubrication it is advisable to remove the corrosion-preventivecompound before packing the bearings with suitable grease.Some bearing types in this catalog are pre-packed with generalpurpose grease suitable for their normal application. Frequentreplenishment of the grease may be necessary for optimumperformance. Care must be exercised in lubricant selection,however, since different lubricants are often incompatible.22210TIMKEN MACHINE TOOL CATALOGWhen specified by the customer, bearings may be ordered prelubricated with suitable greases and oils.Upon receipt of a bearing shipment, it should be ensured that thebearings are not removed from their packaging until they are readyfor mounting so that they do not become corroded or contaminated.Bearings should be stored in an appropriate atmosphere in orderthat they remain protected for the intended period.Any questions concerning the shelf life or storage policy should bedirected to your local sales office.

Bearing SelectionAENGERINGINEAAENGINEERINGBearing Selection Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Determination of Applied Loads and Bearing Analysis . . . . 36Bearing Reactions, Load Ratings and Life . . . . . . . . . . . . . . . 42Permissible Operating Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 53Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56Run-In Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61Heat Generation and Dissipation . . . . . . . . . . . . . . . . . . . . . . . 64Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67Fitting Practices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80Shaft and Housing Considerations . . . . . . . . . . . . . . . . . . . . . . 88Mounting Designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92Setting and Preloading Guidelines . . . . . . . . . . . . . . . . . . . . 101TIMKEN MACHINE TOOL CATALOG11

ENAENIGGNIERA12TIMKEN MACHINE TOOL CATALOG

ENGINEERINGTHE BEARING SELECTION PROCESSATIMKEN BEARINGSTimken provides an extensive variety of rolling bearing types andsizes – to the extent that customers need not look elsewhere.Knowing that the bearing is often the most critical component withina moving assembly, Timken engineers take great care to ensure thecustomer is receiving maximum value when a Timken bearing isselected to perform a given function. With the acquisition of theFafnir brand, Timken can provide the proper bearing for virtuallyany motion-control application. With more than a century of provenexperience in bearing technology, Timken is truly a world leader inthe rolling bearing industry.The Timken Company has an experienced, highly skilled staff oftrained engineers located around the world to assist the customerin bringing new, mechanized products to market. Timken engineersare a powerful resource for customers to turn to for assistance inthe appropriate selection of bearings to meet any of the followingconsiderations: Higher technical demands or higher levels of applicationrequirements. Higher levels of machine complexity. Potential exposure to personal injury.Critical applications where system damage must be avoidedfor all modes of operation.Costly damage or downtime resulting from the use of aninappropriate bearing for a given task.Because Timken offers so many bearing configurations to serve awide variety of situations, a suggested starting point in the selectionprocess should focus on the assessment of two basic categories:the first being boundary (or fixed) conditions and the second beingperformance expectations (or desired results). Depending on yourapplication, the boundary conditions and performance expectationswill vary. Trade-offs or compromises must often be addressed so thatthe final bearing type and size selected are a reasonable balanceof all factors. It is a wise practice to examine factors critical to thesuccess of the device and prioritize them.TIMKEN MACHINE TOOL CATALOG13

ENGINEERINGATypical considerations in machine design also include optimizationof controllable variables affecting application performance: Bearing design. Installation and handling requirements of the bearing, as wellas shaft and housing preparation. Presence of adequate sealing for the exclusion ofcontaminants; types of foreign materials possible. Lubricating method (lubrication type and delivery system).Bearing shaft and housing arrangement; shaft and housingmaterial.Maintenance procedures and intervals.Boundary (or fixed) conditions that should be taken into consideration include: External loads, including radial, thrust, moment, shock andcombination loads. Acceleration and deceleration levels. Other environmental factors, such as humidity, fluids,vibration, debris, magnetic fields. Spatial constraints.Operating temperature range (including extreme limits andthermal cycling).Performance expectations (or desired results) to considerinclude: Rotational accuracy and repeatability (e.g., service precisionlevel). System rigidity (axial or radial stiffness).Application service life.Speed.Since the rolling bearing is an integral part of the machine, lookingat the key operating parameters of the system also will help focuson the most viable bearing solution.Once these conditions and expectations have been identified andprioritized, the most appropriate bearing type(s), size(s), and partnumber(s) that meet the basic application requirements can beselected.BEARING PERFORMANCE CHARACTERISTICSThe following matrix should be viewed only as a general overviewof bearings available from Timken and their general performancecharacteristics. Bearing selection is not a clear-cut, simplisticprocedure, but rather a sequence of interdependent tasks that musttake into consideration customer goals, manufacturing economics,design expectations and, above all, human safety.Most machine tool applications require bearings with extremeprecision, designed specifically to meet the boundary conditionsand performance requirements. Timken super precision bearingsoffer quality and precision tolerances to help customers achievetarget job requirements and production throughput. It is alwaysprudent to enlist the assistance of your Timken representative toachieve optimum results.14TIMKEN MACHINE TOOL CATALOG

ENGINEERINGATapered roller bearingThrust tapered roller bearingSpherical roller bearingCylindrical roller bearing Thrust cylindrical roller bearingThrust spherical roller bearingBall bearingNeedle roller bearingThrust ball bearingThrust needle roller bearingTapered rollerbearingThrust taperedroller bearingCylindrical rollerbearingThrust cylindricalroller bearingSpherical rollerbearingThrust sphericalroller bearingBall bearingThrust ballbearingNeedle rollerbearingThrust needleroller bearingPure cellentUnsuitableGoodPoorExcellentUnsuitablePure axial cellentUnsuitableExcellentCombined orUnsuitableUnsuitableMoment leGoodPoorFairUnsuitableHigh irGoodGoodExcellentQuiet irLow llentExcellentGoodPoorCharacteristicTable 1. Relative operating characteristics of various bearing types.TIMKEN MACHINE TOOL CATALOG15

ENGINEERINGTIMKEN SUPER PRECISION BEARINGSSpeedManufacturers require machine tools that are extremely accurate,reliable and capable of high levels of productivity. A majorcontribution to the performance of any machine tool is supplied bythe rolling bearings used to support the spindles, rotating tables,ball screws and other critical precision positions. A manufacturedbearing’s precision level has a major influence on the ability toperform in high-speed applications commonly seen in factorymachining environments.Today’s industrial machining environments stress maximumproduction rates. To reach these high metal-removal goals,machines are operating at maximum speeds with working spindlestuned to provide premium running accuracy.WHICH TYPE OF TIMKEN BEARING IS MOSTAPPROPRIATE FOR YOUR MACHINE TOOLAPPLICATION?To achieve the highest possible performance precision level, themajority of machine tool-related bearing applications must addressfour primary requirements: speed, stiffness, accuracy and loadcapacity.Achievable spindle rotating speeds require management of heatgeneration within the bearing assembly. The bearing’s ability to notonly minimize heat buildup, but also expel excess heat, is a crucialconsideration in the bearing selection process. Because of thedifferences in rolling element contact geometry, ball bearings aresuperior in minimizing heat generation, especially where higherspeeds a

Timken tapered roller bearing types available in precision classes include the single-row TS and TSF styles, as well as the variable-preload Hydra-Rib bearing, the high-speed TSMA bearing and the compact TXR crossed roller bearing. Timken precision tapered roller bea