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TIMKEN MACHINE TOOL CATALOGPURCHASER’S EXCLUSIVE REMEDY/SELLER’S EXPRESSLIMIT OF LIABILITYPurchaser’s exclusive remedy for any warranty claim, orfor any claim arising out of the purchase or use of ourproducts, shall be the replacement of said products.We will replace 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 orrevenue, loss of use of product, cost of capital,cost of substituted product, facilities, services,or claims of purchaser’s customers for anydamages. Any warranty claim of purchasermust be made within one year of the date ofshipment of the product. This exclusive remedyapplies regardless of the nature of purchaser’sclaim, whether in contract, tort, express or impliedwarranty, negligence or strict liability, upon whichdamages are claimed and regardless of whether thesame is due to our negligence or any defect in our product.2LIMITED WARRANTYTERMS AND CONDITIONS OF SALEWe 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.All 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.NOTE2Every 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.4TIMKEN MACHINE TOOL CATALOG

IntroductionSHELF LIFE AND STORAGE OF GREASE-LUBRICATED BEARINGSAND COMPONENTSTo help you get the most value from our products, Timken providesguidelines for the shelf life of grease-lubricated ball and rollerbearings, components and assemblies. Shelf life information isbased on Timken and industry test data and experience. When removing a product that is not individually packagedfrom a bulk pack container, the container should beresealed immediately after the product is removed. The storage area temperature should be maintainedbetween 0 C (32 F) and 40 C (104 F); temperaturefluctuations should be minimized. The relative humidity should be maintained below60 percent and the surfaces should be dry. The storage area should be kept free from airbornecontaminants such as, but not limited to, dust, dirt, harmfulvapors, etc. The storage area should be isolated from undue vibration.SHELF LIFEShelf life should be distinguished from lubricated bearing/component design life as follows:Shelf life of the grease-lubricated bearing/componentrepresents the period of time prior to use or installation.The shelf life is a portion of the anticipated aggregate designlife. It is impossible to accurately predict design life due tovariations in lubricant bleed rates, oil migration, operatingconditions, installation conditions, temperature, humidity andextended storage.TIMKEN IS NOT RESPONSIBLE FOR THE SHELF LIFEOF ANY BEARING/COMPONENT LUBRICATED BYANOTHER PARTY.European REACH complianceTimken lubricants, greases and similar products sold instandalone containers or delivery systems are subject to theEuropean REACH (Registration, Evaluation, Authorizationand Restriction of CHemicals) directive. For import into theEuropean Union, Timken can sell and provide only thoselubricants and greases that are registered with ECHA(European CHemical Agency). For further information,please contact your Timken engineer.STORAGETimken suggests the following storage guidelines for ourfinished products (bearings, components and assemblies,referred to as “products”): Unless directed otherwise by Timken, products should bekept in their original packaging until they are ready to beplaced into service. Do not remove or alter any labels or stencil markings onthe packaging. Products should be stored in such a way that the packagingis not pierced, crushed or otherwise damaged. After a product is removed from its packaging, it shouldbe placed into service as soon as possible.Extreme conditions of any kind should be avoided.Due to the fact that Timken is not familiar with your particularstorage conditions, we strongly suggest following theseguidelines. However, you may be required by circumstancesor applicable government requirements to adhere to stricterstorage requirements.Most bearing components typically ship protected with acorrosion-preventive compound that is not a lubricant. Thesecomponents may be used in oil-lubricated applications withoutremoval of the corrosion-preventive compound. When usingsome specialized grease lubrications, we advise you to removethe corrosion-preventive compound before packing thebearing components with suitable grease.Be careful in selecting lubrication, however, since differentlubricants are often incompatible.When you receive a bearing shipment, do not remove productsfrom their packaging until they are ready for mounting so theydo not become corroded or contaminated.Store bearings and bearing housings in an appropriateatmosphere so they remain protected for the intended period.TIMKEN MACHINE TOOL CATALOG5

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 suggestedgrease suitable for their machine tool application. Frequentreplenishment of the grease may be necessary for optimumperformance. Care must be exercised in lubricant selection,however, since different lubricants are often incompatible.2226TIMKEN 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Determination of Applied Loads and Bearing Analysis . . . . 32Bearing Reactions, Load Ratings and Life . . . . . . . . . . . . . . . 38Permissible Operating Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 49Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Run-In Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Heat Generation and Dissipation . . . . . . . . . . . . . . . . . . . . . . . 60Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63Fitting Practices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Shaft and Housing Considerations . . . . . . . . . . . . . . . . . . . . . . 84Mounting Designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88Setting and Preloading Guidelines . . . . . . . . . . . . . . . . . . . . . 97

ENAENIGGNIERA8TIMKEN 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.To view more Timken catalogs, goto www.timken.com/catalogsfor interactive versions, or todownload a catalog app for yoursmart phone or mobile devicescan the QR code or go totimkencatalogs.squawqr.com.TIMKEN MACHINE TOOL CATALOG9

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 intoconsideration include: External loads, including radial, thrust, moment, shock andcombination loads. Acceleration and deceleration levels.Operating temperature range (including extreme limits andthermal cycling). Other environmental factors, such as humidity, fluids,vibration, debris, magnetic fields. Spatial constraints.Performance expectations (or desired results) to consider include: 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.10TIMKEN MACHINE TOOL CATALOG

ENGINEERINGATapered roller bearingSpherical roller bearingThrust tapered roller bearingCylindrical roller bearing Thrust cylindrical roller bearingThrust spherical roller bearingCharacteristicTapered rollerbearingThrust taperedroller bearingPure radial loadExcellentPure axial loadGoodCombined loadExcellentBall bearingThrust ball bearingCylindrical rollerbearingThrust cylindricalroller bearingSpherical rollerbearingThrust sphericalroller bearingBall bearingThrust dPoorMoment leGoodPoorHigh odGoodQuiet runningFairFairGoodPoorFairPoorExcellentGoodLow ntGoodPoorLocating cellentNon-locatingposition ExcellentFairTable 1. Relative operating characteristics of various bearing types.TIMKEN MACHINE TOOL CATALOG11

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 are desired.14000Tapered Roller Bearing (TS(TS Metric)Metric)Ball Bearing RPM)(RPM)MaxA100008000600040002000070100130160Bore (mm)(mm)Fig. 1. Tapered roller bearing vs. ball bearing maximum permissiblespeed (with synthetic high-speed grease).Figure 1 compares the relative maximum speed of similar crosssection ball and tapered roller bearings (both using syntheticgrease as a baseline lubricant). Therefore, in applications wherehigher RPM levels are the primary concern, ball bearings have adistinct advantage.Timken offers a wide range ofproducts targeted for improvingmachining efficiency, cuttingaccuracy, and productivity.Qualified sales and serviceengineers are available to helpdetermine an appropriate solutionfor individual applications.Bearings must be carefully designed to minimize heat generationand vibration to enable high speeds. Specific strategies includeoverall bearing configuration, precision internal geometryand material selection. Optimizing bearing ring and shoulderconstruction with the ball complement supports higher speedperformance. Engineering raceway and ball geometry helps tominimize friction, while ceramic rolling elements generate less heatwith reduced skidding.To prevent vibration at high speeds, close bearing tolerances arerequired. Timken machine tool bearings are designed to meet orexceed industry tolerance standards and deliver smooth runningperformance.In addition to the use of hybrid ceramic technology, furtherenhancements in speed, as well as control of bearing noise andtemperature, can be achieved through cage design or material,and choice of lubrication.12TIMKEN MACHINE TOOL CATALOG

ENGINEERINGMany of the factors that allow for maximum speed have beendesigned into Timken’s HX series of super precision ball bearings.Engineered for the reduction of friction and minimum heat buildup,this series features unique ball complements and precisionengineered surface geometries. Options for further enhancingspeed include the use of low weight ceramic rolling elements,lubrication designed for high speed, and lighter preload levels.These are discussed in further detail later in this catalog.StiffnessThe ability to minimize tool deflection experienced under cuttingloads is vital to achieving the accuracy needed to produce finishedparts within specified tolerances. Less variance produces betterquality and helps keep product scrap levels at a minimum. Bearingshave a significant effect on spindle stiffness, due to their deflectionunder applied load. Because of their internal geometry and rollingelement type, tapered roller bearings provide considerably higherstiffness levels as shown in Figure 3 and 4.Seals18000000BallsInner ring1400000012000000200010000000(N/µm)Outer (lbs./in.)RadialCage(retainer orseparator)Tapered Roller Bearing (TS(TS Metric)Metric)Ball Bearing 400000020000000701001301600Bore(mm)Bore(mm)Fig. 3. Tapered roller bearing vs. ball bearing radial stiffness.Cage(retainer orseparator)Cone(inner ring)Fig. 2. Bearing components.Tapered /in.)4000000Tapered Roller Bearing (TS(TS Metric)Metric)(2MM9100WI)(7000C-P4S)Ball Bearing re(mm)Fig. 4. Tapered roller bearing vs. ball bearing axial stiffness.Bearing stiffness also depends on design load zone, which isdirectly related to bearing setting, clearances and applied loads.(Setting

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 bearings range from less than 20.000