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Superprecision Ball BearingsABOUT THE COVERThe Torrington Company is committed to develop,produce and deliver products and services thatconsistently meet or exceed customer expectations.Helping The Torrington Company achieve thegoals stated above are our corps of highly trainedsales engineers, the latest analytical and manufacturing systems, a commitment to research anddevelopment for new ideas and products, ourdevotion to the principles of Total Quality and ahistory steeped in technological firsts in theantifriction industry.This catalog will help you to design the technology, quality and service of The Torrington Companyinto your products. 2000 The Torrington Company1
FAFNIRSUPERPRECISION BEARINGSCONTENTSIntroductionPages4-5Superprecision BearingsPages8-85Ballscrew Support ce Machine Tool SpindlesPagesE51-E63IndexPagesE64-E652102800
FAFNIR ra-Light 2MMV9100HX SeriesExtra-Light 2MM9100WI, 3MM9100WI SeriesExtra-Light MM9100K SeriesLight 2MM200WI, 3MM200WI SeriesLight MM200K SeriesMedium 2MM300WI, 3MM300WI SeriesMedium MM300K SeriesEx-Cell-O Spindle BearingsHybrid Ceramic WSUPPORT BEARINGSNomenclature ChartBallscrew Support BearingsBSBU DStandard and Heavy Duty BearingsBSBU QStandard and Heavy Duty BearingsBSPB DStandard and Heavy Duty BearingsBSPB QStandard and Heavy Duty Bearings81011Shelf Life and Storage ndard Tolerances, Inner Ring, ABEC-7,-9E4Width TolerancesE4Standard Tolerances, Outer Ring, ABEC-7,-9E5Shaft and Housing GeometryE6Recommended Spindle Shaft TolerancesE8,E9Recommended Spindle Housing Tolerances E10-E15Ball Screw Shaft and HousingE16Shoulder DiametersSpindle Shaft and HousingShoulder DiametersE17-E19Locknut TorqueMicron Bore and O.D. CodingLube Inlet DiametersRecommended Ball Screw Shaftand Housing TolerancesTypical Mountings of Duplex BearingsBack-to-Back vs Face-to-Face MountingSpring-Loaded MountingsPreloadingBearing SelectionBearing SpacersForwardProcedureEnclosed Dust-Free Working AreaInspection of Parts Before AssemblyBearing PackingBearings Assembled in Spindle MountingBearings and Shaft Assembled withEccentricities OpposedScraping Locknut to Eliminate RunoutChecking Temperature, Vibrationand RoughnessCleanlinessTypical Applications of Ball Bearingsto Machine Tool SpindlesQuick Reference Data SheetsBearing Analysis 1E32E34Housing DesignHousing SealsBearing LocknutsHeat GenerationPermissible Operating SpeedLubrication TypesEngineering NotationsLife CalculatorsLife Adjustment FactorsApplicationsRadial Internal 5-E48E49ENGINEERINGNomenclature ChartSuperprecision Bearing IntroductionMachine Tool Offering ChartBearing TypesAngular ContactBallscrew Support BearingsUltra-Light 2MM9300WI, 3MM9300WI SeriesExtra-Light 2MMV99100WN,3MM99100WN Series1144555555MAINTENANCE MACHINETOOL SPINDLESThe Torrington CompanyThe Torrington CommitmentFafnir Superprecision BearingsUsing This CatalogHybrid Ceramic BearingsConditions of SaleWarrantyLiabilityRestricted ApplicationsSafety ee last page of catalog for Engineering Sales Offices1028003
INTRODUCTIONINTRODUCTIONThe Torrington Company (hereinafter referred to as “Torrington”),part of worldwide Ingersoll-Rand, is a bearing and automotivecomponent supplier of international stature. Its global presence inNorth America, Europe, Australia, South America and the FarEast, plus joint ventures in Japan, The People’s Republic ofChina, and Europe, support customer operations around theworld.Torrington began manufacturing bearings in the early 1900sand now produces every basic type of precision ground antifriction bearing, as well as many precision components for othermechanisms. Torrington’s wholly owned subsidiary, KilianManufacturing Corporation, produces lighter duty machinedbearings. Torrington’s merger with Fafnir Bearing, founded in1911 and recognized as one of the world’s major suppliers ofprecision bearings and housed units, has further strengthenedTorrington’s leadership position as a broad line supplier to theworld’s industries.Torrington’s world leadership position in an automotivecomponent technology is based on its complete technical ability.This extends from the initial design stages through applicationanalysis, to optimizing the entire manufacturing process. Theexperience gained from broad design and manufacturingactivities is available to our customers through Torrington’sresident engineers and field sales engineers in all parts of theworld.As Torrington enters the 21st century, it has dedicated itscapabilities and resources — its people, facilities, systems andtechnologies — to two goals: producing world-class products. assuring total customer satisfaction.TORRINGTON IS AT HOME AROUND THE WORLDTo support its sales and service activities, Torrington has: Over 20 manufacturing plants on five continents. Over 40 district sales engineering offices throughout theworld. Warehouses throughout the U.S.A., Canada and Germany,with interlinking computerized inventory control. Extensive capabilities in metric and inch bearings. Technical resources for customer assistance.For new concepts of the future, for the challenges faced byindustry, Torrington offers in-depth design assistance andmultinational supply capability for products that are made toidentical standards worldwide.USING THIS CATALOGWe are committed to providing our customers with maximumservice and quality. Included in this commitment is a concern forthe suitability of the bearing selected for any application. Onlythose with sufficient engineering training and technical competence to interpret and apply the data and principles involvedshould make the final selection of a bearing. The part number inthis catalog describes only the dimensions. The part number ofthe product supplied may differ than those listed in these pages.This catalog contains dimensions, tolerances and loadratings, as well as an engineering section describing fittingpractices for shafts and housings, internal clearances, materialsand other features of superprecision bearings. It is not to beconsidered as containing sufficient data for reliable bearingdesign and selection for all applications. It can, however, providevaluable assistance in the initial consideration of the type andcharacteristics of the bearing which may be most suitable forparticular needs.Although all data in this catalog has been carefully compiledto make the information as complete as possible, Torringtonassumes no liability to any company or person for any damages,direct or indirect, to property or person, based on informationcontained in this publication.CATALOG FEATURESDimension and load rating data for the various types and stylesof bearings is organized by size. There is also a numeric/alphalisting of product designation codes in the front of the catalog.ISO, DIN, and “ABMA”*, as used in this catalog, refer to theInternational Organization for Standardization, Deutsches Institutfür Normung EV and the American Bearing ManufacturersAssociation.FAFNIR SUPERPRECISION BEARINGSFafnir introduced its superprecision bearings, developedspecifically for machine tool applications, in 1935. Since that timeour engineers, designers, metallurgists and skilled machinists,utilizing state-of-the-art process technology have made improvements in their design, material, lubrication, and manufacturingprocesses. The result is a line of Fafnir superprecision bearingscapable of higher speeds, greater reliability, and wider versatility.As part of our on-going research, development and testingprogram, our engineers analyze their client’s applicationproblems using sophisticated computers and software whichenable them to: recommend the precise type and size of bearing that willgive optimum performance under a variety of conditions. predict the probable service life of all bearings with considerable accuracy.All of the superprecision bearings listed in this catalogembody the same high standards of precision and quality whichhave made the FAFNIR name synonymous with bearingexcellence throughout the world.The following are registered trademarks of The TorringtonCompany:TorringtonFafnirKilianWuxi * Formerly the AFBMA – Anti-Friction Bearing Manufacturers Association.4102800
HYBRID CERAMIC BEARINGSAny of the bearings offered by the Torrington Company arealso available with ceramic, silicon nitride, rolling elements.Designed with increased speed capabilities, the hybridceramic bearing features a higher elastic modulus for graterstiffness. Its lower friction characteristics result in less skiddingthan the all-steel bearings are discussed in greater detail onpages 38 and 39.The Torrington Company Sales Engineer in your area canassist you in determining if the hybrid ceramic bearing is suitablefor your application. They will help you to determine if hybridceramics are the answer, or if another Torrington Companyproduct is a better solution. For the location of the TorringtonCompany Sales Office in your area refer to the last page inthis catalog.SALES ENGINEERING SERVICESSince no catalog can include or disclose all the factors necessaryfor proper bearing selection in every type of application, wehighly recommend consulting with us on any application whereproperty damage or injury to persons from misapplication shouldbe of special concern in the selection of the bearing.Part of the Torrington world-wide service system is a corps ofhighly trained sales engineers who are available to work towardsolving new or unusual problems. Torrington may have alreadysolved a similar problem and can offer a speedy, cost-effectivesolution. The last page of this catalog lists the phone number andaddress of the Torrington office nearest you.Torrington reserves the right to change the design and/orspecifications of its products without notice.TERMS AND CONDITIONS OF SALEAll products described in this catalog are subject to Torrington’sTerms and Conditions of Sale, copies of which are available fromTorrington’s district offices as listed in the back of this catalog.It is understood that the buyer, in selecting and ordering from thiscatalog which supersedes all previous editions, accepts allTerms and Conditions of Sale including the following:INTRODUCTIONINTRODUCTIONSeller makes no other warranty or representation of anykind whatsoever, expressed, or implied, except that of titleand all implied warranties, including any warranty of merchantability or fitness for a particular purpose, are herebydisclaimed.LIABILITYTotal liability of Torrington with respect to any order, whetherbased on contract, warranty, negligence, indemnity, strict liabilityor otherwise, shall not exceed the purchase price of the partupon which such liability is based.Torrington shall in no event be liable to the buyer, anysuccessors in interest or any beneficiary of any order, for anyconsequential, incidental, indirect, special or punitive damagesarising out of such order or any breach thereof, whether or notsuch loss or damage is based on contract, warranty, negligence,indemnity, strict liability or otherwise.NUCLEAR APPLICATIONThe bearings described within this catalog are not intendedfor nuclear application. Should any such application be considered, it is urged that you consult with Torrington.For use within any nuclear facility, Owner/Licensee of thenuclear facility and/or buyer shall indemnify and hold Torringtonharmless from any liability occurring on or off-site, at any time,including loss of use, whether based in contract or tort, includingnegligence attributable in whole or in part to Torrington, resultingdirectly or indirectly from a nuclear incident.HELICOPTER APPLICATIONTorrington has discontinued offering it’s products to thehelicopter industry. This includes bearings previously sold tothe helicopter industry under the Torrington, Fafnir and Kiliantrade names. As a result of this decision, Torrington will nolonger provide engineering support nor recommend thatTorrington bearings be used in helicopter applications.With regard to aircraft bearings manufactured to militarystandards, only the aircraft/helicopter manufacturer can determine if the aircraft mil spec bearings are suitable for usein its aircraft.WARRANTYTorrington warrants that parts manufactured by it will be asspecified and will be free from defects in material and workmanship. Torrington’s liability under this warranty shall be limited tothe repair or replacement or the repayment of the purchase price,or the granting of a reasonable allowance (as Torrington mayelect) of any part which upon return to Torrington is found to bedefective at the time of shipment, providing the buyer notifiesTorrington of any such defect within 10 days of its discovery, butin no event later than 90 days from the date of shipment of suchpart by Torrington. Repair or replacement shall be made byTorrington F.O.B. point of shipment.102800SAFETY RECOMMENDATIONS Product should be stored in a dry and clean area. Package should not be opened until ready to use. Prior to installation, Torrington should be consulted forrecommendations. Proper installation and maintenancemust be adhered to for ultimate performance. Failure to adhere to recommendations may result inpremature product failure, and/or in extreme cases,personal injury.5
INTRODUCTIONSHELF LIFE AND STORAGE OF GREASELUBRICATED BEARINGS AND COMPONENTSSHELF LIFE POLICY:STORAGE POLICY:The Torrington Policy for the Shelf Life of Grease Lubricated Rolling Element Bearings, Components and assemblies is set forth below. The Shelf Life values are based ontest data and experience.Shelf Life should be distinguished from lubricatedbearing/component Service Life as follows:The Torrington policy recommends the following storageguidelines for its finished products (bearings, components,and assemblies, hereinafter the “Products”): Unless directed otherwise by The Torrington Company,Products should be kept in their original packaging untilthey are ready to be placed into service.Shelf LifeThe Shelf Life of the grease lubricated bearing/component is the maximum allowable time interval from date oforiginal manufacture/packaging to the removal from theoriginal packaging (hereinafter referred to as “Shelf Life”). Do not remove or alter any labels or stencil markings onthe packaging. Products should be stored in such a way that thepackaging is not pierced, crushed or otherwise damaged. After a Product is removed from its packaging, it shouldbe placed into service as soon as possible. When removing a Product that is not individually packaged from a bulk pack container, the container should beresealed immediately after the Product is removed. Do not use Product that has exceeded its Shelf Life asdefined in Torrington’s Shelf Life Policy Statement. 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 below 60%. The storage area should be kept free from airbornecontaminants such as, but not limited to: dust, dirt,harmful vapors, etc. The storage area should be isolated from undue vibration. Extreme conditions of any kind should be avoided.Service LifeThe Service Life of the grease lubricated bearing/component is a measure of the anticipated aggregate usage(hereinafter referred as “Service Life”). Variations in lubricant bleed rates, oil migration, operating conditions, installation conditions, temperature, humidity and extended storagemake it impossible to accurately predict Service Life.The Bearing Shelf Life is related primarily to thelubricant’s ability to maintain the bearing’s original manufactured radial internal clearance and freedom to rotate.The Component Shelf Life is related to the ability of thecomponent to function as originally intended.The Shelf Life values, available from the TorringtonDistrict Sales Office, represent the period of time prior touse or installation. Due to the broad range of applications,Torrington cannot anticipate the performance of the greaselubricant after the bearing or component is installed orplaced in service.These Shelf Life values are to be used as a maximumlimit – assuming adherence to the Torrington recommended storage and handling policy. Deviations fromTorrington’s Storage and Handling Policy may reduce ShelfLife. Any specification or operating practice that defines ashorter Shelf Life should be used.THE BEARING/COMPONENT SHOULD NOT BE PUTINTO SERVICE IF THIS SHELF LIFE IS EXCEEDED.TORRINGTON DISCLAIMS RESPONSIBILITY FOR THESHELF LIFE OF ANY BEARING/COMPONENT LUBRICATED BY ANOTHER PARTY.6In as much as The Torrington Company is not familiarwith a customer’s particular storage conditions, theseguidelines are strongly recommended. However, thecustomer may very well be required by circumstance,applicable government requirements, and the like toadhere to stricter storage requirements.FAILURE TO FOLLOW THESE GUIDELINES MAYRESULT IN REDUCED PRODUCT SHELF LIFE AND/ORADVERSELY AFFECT PRODUCT PERFORMANCE.Any questions concerning the Shelf Life or Storage Policyshould be directed to the local District Sales Office.102800
INTRODUCTIONINTRODUCTION1028007
Superprecision Ball BearingsH, R, J, P† internal fit† P fit is standard in Conrad BearingsContact Angle:2 15 3 25 Construction:K ConradWI angular contact; low shoulder on outer ringWO angular contact; low shoulder on inner ringWN angular contact; low shoulder on both ringsHX angular contact; low shoulder on both ringsLevel of Precision:MM superprecision ABEC-7 (ISO P4)MMV super high precision (HG) between ABEC-7(ISO P4) and ABEC-9 (ISO P2)MMX ultraprecision ABEC-9 (ISO P2)Retainer: No retainer callout impliesFafnir PRCPRB molded nylon cagePRC molded reinforced nylon cageCR phenolic (composition) – Fafnir standard2 MM C 91 04 WI CR DUL A3188HybridCeramic8Series:9300910099100200300ultra lightextra lightextra lightlightmediumBore Size:(04 and up,multiply theselast two numbersby 5 to get borein millimeters:)00 10mm01 12mm02 15mm03 17mm04 20mmPreload: Universal Flush Ground*SUX single bearing, extra light*SUL single bearing, light*SUM single bearing, medium*SUH single bearing, heavyDUX duplex pairs of bearings, extra lightDUL duplex pairs of bearings, lightDUM duplex pairs of bearings, mediumDUH duplex pairs of bearings, heavyTUX triplex set of bearings, extra lightTUL triplex set of bearings, lightTUM triplex set of bearings, mediumTUH triplex set of bearings, heavyQUX quadruplex set of bearings, extra lightQUL quadruplex set of bearings, lightQUM quadruplex set of bearings, mediumQUH quadruplex set of bearings, heavy* if "u" is first letter here, assume singlean exampleof a specificationnumber forother thanstandard102800
SUPERPRECISIONBEARINGSFAFNIR SUPERPRECISION BEARINGS1028009
FAFNIR SUPERPRECISION BEARINGSSuperprecision MM (ABEC-7, ISO P4)Superprecision bearings of the K or non-filling slot construction are generally used on woodworking spindles,aircraft accessory units and machine tool applicationswhere duplex bearings are not a definite requirement.By virtue of the single row radial deep groove constructionand superprecision tolerances, they are capable of carryingthrust loads in either direction and have relatively highspeed ability.More popular on precision machine tool spindle applications are the WI angular-contact type bearing variations,namely 2MM-WI and 3MM-WI. Since this bearing typehas a low shoulder on outer ring, it carries thrust in onedirection.Fafnir's MM Superprecision bearings are finished toMMV tolerances – as standard procedure.Super High Precision MMV (HG)Superprecision bearings are manufactured to our new HGtolerance class, with running accuracy and performancemeeting ABEC-9 (ISO P2) while maintaining noncriticalfeatures at ABEC-7 (ISO P4) level for cost-effectiveness.Bore and O.D. surfaces are coded in micron units for theconvenience of the discriminating machine tool builder whois striving for optimum fitting of all spindle components.The recent development of ceramic rolling elements inhigh performance bearings offers the customer the ultimateof speed capability, high stiffness, long life, low heatgeneration, and overall system reliability. The 99100 seriesis available with the option of ceramic ball selection.Ultraprecision MMX (ABEC-9, ISO P2)Superprecision bearings with closer tolerances and runningaccuracies than ABEC-7 (ISO P4) bearings are made toABEC-9 (ISO P2) tolerances. Bearings produced to thesetolerances are generally made as WO and WN construction, and are use on ultra-high speed grinding spindlesdesigned for tight dimensional tolerances and super-finesurface finishes. Consult our Engineering Department foravailability.10102800
FAFNIR SUPERPRECISION BEARINGSMACHINE TOOL BEARING PRODUCT RANGE*Bore Size (mm)TYPE102030405060708090100110120130 140150160 170180 190200SPINDLE BEARINGSSUPERPRECISIONBEARINGS2MM(3MM)9300WIPages 14-23MM9100KPages 52-542MM(3MM)9100WI 2MM(3MM)V9100HXPages 42-51Pages 34-41MM200KPages 66-682MM(3MM)200WIPages 56-65MM300KPages 78-802MM(3MM)300WIPages 69-77BALL SCREWSUPPORT BEARINGSMM9300 (MM . . . BS)Pages 88-91*Current product offering range. For sizes not found within this listing, check with the TorringtonEngineering Department for design possibilities.10280011
FAFNIR SUPERPRECISION BEARINGSBearing TypesAngular-Contact Bearings2MM -WI type, with 15 initial contact angle is designed tomeet the needs of machine builders for precision bearingswhich will operate at as low a temperature as possible for awide range of speeds and operating loads. In order formachines to produce more accurate work at a higher production rate, the bearings must provide a high degree of rigidity inboth axial and radial directions while operating at minimumtemperatures. For example, precision machining or cuttingtools impose heavier loads on bearings than those encountered in precision grinding. In the former, speeds are slowerand loads heavier than the latter, where speeds are high andloads light. The 2MM-WI type gives the machine builder theflexibility required to meet such variations in applications.3MM -WI type, manufactured with 25 contact angle,is for use on applications where the loading on the bearings ispredominately thrust — and a high degree of axial rigidity is adefinite requirement. Typical applications for these are largevertical rotary surface grinders, horizontal and vertical discgrinders, and thrust bearing applications for heavy duty latheswhere the bearings must directly carry extremely high tail stockor chucking pressure.2MM -WO type, with 15 initial contact angle is designed forextremely high-speed applications where centrifugal force ofthe balls is the principal load on the bearing. Unlike the MM-WItype which has a low shoulder outer ring, the 2MM-WO typehas full shoulders on both sides of the outer race and a lowshoulder on one side of the inner ring. This design permitsassembly with a maximum complement of balls and a onepiece cage which pilots against the precision-ground lands ofthe outer ring. Generally this bearing series is supplied with aseparable inner ring and ball retaining cage along with specialrace geometry for extremely high speed operation.2MM-WI Type3MM-WI Type2MM-WO Type2MMV and 3MMV99100WN types are available with 15 or25 contact angle variations and have been developed tooperate under the demanding requirements of high speedmachine tools. They incorporate design features which permitoperation at higher speed than standard angular contact ballbearings. The bore, outside diameter, and width are the sameas the MM9100 series.This series is designed to operate at rotational speeds 20%greater than the MM9100 series, with no increase in operatingtemperature. The greatest advantage of these series is atspeeds greater than 500,000 DN (Bore in mm x RPM). Siliconnitride balls (ceramic) and precision machined ball separatorsare available and, when used, the ultimate performance will beachieved.122MMV and3MMV99100WN Types102800
FAFNIR SUPERPRECISION BEARINGS2MMV-HX TypeSUPERPRECISIONBEARINGS2MMV - HX type, with 15 initial contact angle is designed tomeet the needs of machine manufacturers who requireoptimum oil flow through the bearings. This design incorporates a low shoulder on the non-thrust side of both the innerand outer rings. The maximum complement of balls isseparated by a one-piece cage which pilots against theground land of the outer ring.Fafnir has developed an ISO Series – 10 bearing designedto enhance two key factors contributing to metalworkingthroughput: spindle speed and radial stiffness.This design enables spindle heads to remove morematerial in less time while maintaining superior finishedproduct tolerances by minimizing tool “wander”. This efficientcombination translates into faster turn around of finishedproduct. These improvements are imparted by subtlechanges to ball complements and internal geometriesconcluded by Fafnir design engineers as being a reliable pathtoward better machining efficiencies.The Fafnir HX Series is dimensionally interchangeablewith our present 9100 and 99100 series spindle bearingsalong with competitive ISO Series-10 designs.Ballscrew Support BearingsTo meet the requirements of the servo-controlled machineryfield, Torrington has developed a new series of ball bearingsspecially designed for ballscrew applications. Design criteriafor these bearings are maximum axial rigidity, low dragtorque, and extreme control of lateral eccentricity.These bearings are manufactured to ABEC-7 tolerancesand are of the nonseparable angular-contact type design witha 60 contact angle and maximum complement of balls.Thesebearings are supplied prelubricated with heavy duty greaseNLGI #2 . Bearings are supplied packaged in DB arrangement. However, they can be mounted in duplexed pairs andin multiplexed sets in either Back-to-Back (DB), Face-to-Face(DF) or Tandem (DT) arrangements.Standard sizes are available and are stocked and packaged as duplex pairs, triplex sets or quadruplex sets. Thesebearings are designed primarily for ballscrew applications andshould not be considered in other areas such as spindles orgear-box shafting without approval by our EngineeringDepartment. These bearings are offered in both standard inchand metric envelope dimensions.102800MM9300WI DUH (Inch)MM BS DUH (Metric)13
FAFNIR SUPERPRECISION BEARINGSCUltra-Light2MM9300WI &3MM9300WI SeriesSuperprecision MM:Superprecision bearings are manufactured to a ABEC-7(ISO P4) tolerance class.dDWI Construction:This design incorporates a low shoulder on the non-thrustside of the outer rings. The maximum complement of ballsis separated by a one-piece cage which is piloted againstthe ground thrust shoulder land of the outer ring.CTO ORDER: Specify bearing number with prefix 2MM for 15 contactangle and 3MM for 25 contact angle.Example 2MM9300WI CRDIMENSIONS – TOLERANCESBearingNumberALL INCH TOLERANCE IN .0001 UNITSOutsideDiameterTolerance .0000" .0 µmto minusBoreTolerance .0000" .0 µmto minus2MM & 3MMWidth *Tolerance .0000" .0 µmto minusMaximumFillet RadiusBearing Cornerwill Clear 12131314141 81 89 649 643 .60.617191919213 163 167 321 41 01.01.023232527241 49 329 329 32Qty. (Dia.) in.11 32* Refer to page E4 for width tolerance of preloaded bearings.** ABMA std. 20 (ras max).14102800
FAFNIR SUPERPRECISION BEARINGSDDdC (WIDTH)X2C (WIDTH)X2Back-to-BackDBFace-to-FaceDFWI Type Duplex Mounting ArrangementsDIMENSIONS – TOLERANCESBearingNumberC (WIDTH)X2TandemDTALL INCH TOLERANCE IN .0001 UNITSOutsideDiameterTolerance .0000" .0 µmto minusBoreTolerance .0000" .0 µmto minus2MM & 3MMDdSUPERPRECISIONBEARINGSdWidth *Tolerance .0000" .0 µmto .26778.66149.055111.0236210220230280MaximumFillet RadiusBearing Cornerwill Clear 2811 3211 323 813 3213 0.0390.0590.0591.01.01.01.51.5293130303213 3213 3215 3217 3217 02.02.12727292711 1623 3223 32Qty. (Dia.) in.15 16* Refer to page E4 for width tolerance of preloaded bearings.** ABMA std. 20 (ras max).10280015
FAFNIR SUPERPRECISION BEARINGSUltra-Light2MM9300WI SeriesRADIAL
precision bearings and housed units, has further strengthened Torrington’s leadership position as a broad line supplier to the world’s industries. Torrington’s world leadership position in an automotive component technology is based on its complete technical ability. This e
