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POCKET GUIDEMAINTENANCE OF BEARINGSSUBSCRIBE TO NSK NEWSLETTER
ContentAbout NSK . 4General and Maintenance dedicated section . 6How to order a replacement Bearing . 8Basic Bearing Types. 10Standard Bearings – Interchange . 12Mounted Units – Interchange . 16Mounted Units Inserts – Interchange . 20Technical section . 22Care and maintenance . 24Importance of proper fits . 25Loading conditions and fits . 26Fits between Radial Bearings and Housing Bores . 28Fits between Radial Bearings and Shafts . 30Tolerances for Shaft Diameters . 34Tolerances for Housing Bore Diameters . 382
Mounting of Cylindrical Bore Bearings with interference fit . 40Mounting of Cylindrical Roller Bearings . 42Shrink fits . 44Mounting of Spherical Roller Bearings on adapter sleeves . 48Mounting of Self-Aligning Ball Bearings . 56Bearing Lubrication . 62Bearing Doctor section . 64Causes and countermeasures for operating irregularities . 66Flaking . 68 Scoring . 69 Smearing . 70Fracture . 71 Cracks . 72 Cage damage . 73Denting . 74 Pitting . 75 Fretting . 76False brinelling . 77 Creep . 78 Seizure . 79Electrical corrosion . 80 Rust and corrosion . 81 Mounting flaws . 82Discoloration . 83NSK Sales Offices – Europe, Middle East and Africa . 843
Our most important product: Our customers’ statisfactionWe are among the leading manufacturers for rolling bearings, linear technologycomponents and steering systems worldwide. We can be found on almost everycontinent – with production facilities, sales offices and technology centres – becauseour customers appreciate short decision-making channels, prompt deliveries andlocal service.EuropeThe Americas4HeadquarterJapanAsia
The NSK CompanyNSK commenced operations as the first Japanese manufacturer of rolling bearingsback in 1916. Ever since, we have been continuously expanding and improving not onlyour product portfolio but also our range of services for various industrial sectors. In thiscontext our worlwide research and production facilities are linked together in a globalnetwork. Here we concentrate not only on the development of new technologies, but alsoon the continuous optimisation of quality – at every process stage. Among other things,our research activities include product design, simulation applications using a varietyof analytical systems and the development of different steels and lubricants for rollingbearings.More about NSK under: www.nskeurope.comTrademarks: All NSK product and service names listed in this catalogue are trademarks or registered trademarks of NSK Ltd.5
General and maintenance dedicated section6
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How to order a replacement BearingExtract failed bearing from MachineDoes the bearing have a designation?YESDoes it have an NSK reference ?NOIdentify bearing designationFind NSK equivalent bearing designationon the interchange list from page 12 onYESObtain a new bearing from Authorised NSK Distributor8
NODetermine basic bearing type i.e.: ball, roller, using sketches on following pageMeasure basic dimensions: Bore (d), Outside diameter (D), Width (B)Obtain NSK Designation by using ”selection by dimension“ pages (Bearing Replacement Guide) or consult Authorised NSK DistributorQuote NSK Designation to Authorised NSK DistributorObtain a new bearing from Authorised NSK Distributor9
Basic Bearing TypesSingle Row Deep Groove Ball BearingSingle Row Angular contact Ball BearingDouble Row Angular contact Ball BearingDouble Row Self-Aligning Ball BearingSingle Row Cylindrical Roller BearingDouble Row Spherical Roller BearingSingle Row Tapered Roller BearingSingle Row Thrust Ball Bearing10If the failed bearing is not on thispage, please consult your AuthorisedNSK Distributor or NSK direct.
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Standard Bearings – InterchangeBearing TypeManufacturerFAGSKFSNRNTNNSKSingle row Deep Groove Ball Bearings 600-6000-6200-6300-6400 SeriesZR/2ZRZ/2ZZ/ZZZ/ZZZ/ZZ1 or 2 contact seals1 or 2 shieldsRSR/2RSRRS1/2RS1E/EELU/LLUDU/DDU1 or 2 non contact 2/C3 etc.C2/C3 etc.J20/J30 etc.C2/C3 etc.C2/C3 etc.TN9BlankAABC2/C3 etc.J20/J30 etc.C2/C3 etc.Groove without / with Snap ringRadial Internal Clearance (if different from normal CN clearance)Double row Deep Groove Ball Bearings 4200-4300 SeriesPolyamide CageWithout Filling SlotsRadial Internal Clearance (if different from normal CN clearance)TNGSingle row Angular Contact Ball Bearings (standard range ) 7000-7200-7300-7400 SeriesContact Angle 40 BExtra CapacityPolyamide CageUniversal Mounting12BBETVPSteel CageMachined Brass CageBPBEAAJT2T85JWMPMML1BlankUA / UOCB/GGGG, SU
Bearing TypeManufacturerFAGSKFSNRNTNNSKBlankBlankDouble row Angular Contact Ball Bearings 3200-3300-5200-5300 SeriesContact Angle 32 and 35 with Filling SlotsBlankBlankABABBTVH/TVPTN9G15TNGSteel CageBlankBlankBlankBlankMachined Brass CageM/MAMMBlankContact Angle 25 and 32 without Filling SlotsPolyamide Cage1 or 2 shieldsBlankZR/2ZRZ/2ZZ/2Z1 or 2 contact sealsRSR/2RSRRS/2RSRSR/2RSRRadial Internal Clearance (if different from normal CN clearance)C2/C3 etc.C2/C3 etc.J20/J30 etc.C2/C3 etc.C2/C3 etc.Double row Self-Aligning Ball Bearings 1200-1300-2200-2300-100-11200 11300-11500 SeriesSteel CageBlankBlankBlankBlankPolyamide CageTVTN, TN9G15BlankTNGMachined Brass CageMMMM2RS2RS1EEC2/C3 etc.C2/C3 etc.J20/J30 etc.C2/C3 etc.C2/C3 etc.KKKKK2 contact SealsExtra CapacityRadial Internal Clearance (if different from normal CN clearance)Tapered Bore 1:12M2RSEE13
Standard Bearings – InterchangeBearing TypeManufacturerFAGSKFSNRNTNNSKBall Thrust Bearings, Single and Double Direction 51100/200/300/400 - 52200/300/400 53200/300/400 - 54200/300/400 SeriesSteel CageBlankBlankBlankBlankMachined Brass CageM, MPBlankBlankMUUUUPolyamide CageTVPTN, TN9Machined Brass CageMPABlankMABlankBlankC2/C3 etc.C2/C3 etc.J20/J30 etc.C2/C3 etc.C2/C3 etc.With Seat WasherBlankDuplex Contact Ball Bearings QJ200 - QJ300 SeriesRadial Internal Clearance (if different from normal CN clearance)Single row cylindrical Roller Bearings N, NU, NUP, NJ / 200-300-400 N, NU, NUP, NJ / 1000-2200-2300 SeriesPolyamide CageTVP2PG15BlankT, T7Steel CageBlankJBlankBlankWMachined Brass CageM, M1MMBlankMEECEEEC2/C3 etc.C2/C3 etc.J20/J30 etc.C2/C3 etc.C2/C3 etc.BlankExtra CapacityRadial Internal Clearance (if different from normal CN clearance)Single row tapered Roller Bearings 30200/300-31300-32000/200/300 33000/200 Series14Steel CageBlankBlankBlankExtra CapacityBlankBlankA, VBlankprefix HR
Bearing TypeManufacturerFAGSKFSNRNTNNSKDouble row Spherical Roller Bearings 21300-22200-22300-23000-23100 23200-23900-24000-24100 SeriesPolyamide CageTVPBSteel CageBlankMachined Brass CageExtra CapacityRadial Internal Clearance (if different from normal CN clearance)HBlankAJC, CD, EA, JM, MA, MBECA, ECACM, MBL1M, MB, CAMEE, ExplorerEEBlank, EC2/C3 etc.C2/C3 etc.J20/J30 etc.C2/C3 etc.C2/C3 etc.Tapered Bore 1:12KKKKKTapered Bore 1:30K30K30K30K30K30Blank, SW33B33D1E4,W33Heat Stabilized to 200 CLubrication groove & holesBlankBlankBlankBlankBlank, S11Vibrating Equipment ApplicationsT41AA15, VA405F800, F801UAVS1U15VS, VBBlankMSpherical Thrust Roller Bearings 29300-29400 SeriesSteel CageMachined Brass CageExtra CapacityBlankBlankMBBlankEEEBlankThe list identifies the bearing series only. The user should check the relevant table to verify the characteristics and dimensions, and select theexact designation. The list is given in good faith, but no responsibility can be accepted for errors or omissions.15
Mounted Units – InterchangeMounted Units Type16ManufacturerSKFINASY-TF / PX00NSKUCP200D1RHP J-Line RHP Self-LubeUCP200D1UCPX00D1NPMPSY-WF / SYJ-WFRASEUELP200UGP200EXPE/EXPSY-FM / SYJ-FMPASEAELP200UHP200ESPE/ESPUELP200D1 UELP200D1NP-ECSY-RM / SYJ-RMPASEYASP200BP200USPE/USPNP-AFY-TF / UCF200D1UCFX00D1UELF200D1 UELF200D1NP-DECSFMSFFY-WF / FYJ-WFRCJUELF200UGF200EXFE/EXFFY-FM / FYJ-FMPCJAELF200UHF200ESFE/ESFSF-DECSF-ECFY-RM / FYJ-RMPCJYASF200BF200USFE/USFSF-AFYTB-TF / FYTJ-TFRCJTYUCFL200UCFL200UCFLE/UCFL UCFL200D1 -WF / FYTJ-TFRCJTUELFL200UGFL200EXFLE/EXFL UEFL200D1 UELFL200D1FYTB-FM / FYTJ-FMPCJTAELFL200UHFL200ESFLE/ESFLSFT-ECFYTB-RM / FYTJ-RMPCJTYASFL200BFL200USFLE/USFLSFT-A
Mounted Units UCFC200UCFCX00UCFCX00UCFCE/UCFCNSKRHP J-Line RHP Self-LubeUCFC200D1 200EXFCE/EXFC UELFC200D1 200LFTC-AUCUP200UCPA200SYF-TF / SYFJ-TFRSHEYSYF-WF / SYFJ-WFRSHEUCPAE/UCPA UCUP200D1 UCUP200D1SNPEXPAE/EXPA UELUP200D1 UELUP200D1SNP-DECSYF-FM / SYFJ-FMPSHEESPAE/ESPASNP-ECSYF-RM / SYFJ-RMPSHEYUSPAE/USPASNP-A17
Mounted Units – InterchangeMounted Units TypeManufacturerSKFTU-TF / RRHP J-Line RHP TX00D1TU-WF / TUJ-WFRTUEUELT200UGT200EXTTU-FM / TUJ-FMPTUEAELT200FHT200ESTST-ECTU-RM / HERHEUELHB200PHEAELHB200ESEHESCH / SCHB-ECPHEYASHB200USEHESCH / SCHB-AEXEHEUELT200D1 UELT200D1STMSTUCHB200D1ST-DECSCH / SCHBSCH / SCHB-DECThe list identifies the bearing series only. The user should check the relevant table to verify the characteristics and dimensions,and select the exact designation. The list is given in good faith, but no responsibility can be accepted for errors or omissions.
Mounted Units TypeManufacturerSKFINANTNASAHISNRNSKRHP J-Line RHP AELPFL200 FMRATRESPFTSLFT-ECPFD-RMRATRYUSPFTSLFT-A19
Mounted Units Inserts – InterchangeBearing S200B200US200YEL2-2FGE-KRRBUEL200UG200 EREX200GE-KPPB320EX200L3NSKRHP J-Line RHP Self-Lube1000GUC200D1LLJ 1200G1000DECGUEL200D1LLJ UEL200D1L3T1000DECG
Bearing 00KH200 NPPBCS200LLUCS200ZZUC300UC300NSKRHP J-Line RHP Self-LubeUEL200D1W3 UEL200 D11000DECGFSAEL200D1W3 AEL200D11200ECGUK200D1 H2300UK200D1 H2300CS200LLUUC3001000-KG1726200-2RSUC300 D1The list identifies the bearing series only. The user should check the relevant table to verify the characteristics and dimensions,and select the exact designation. The list is given in good faith, but no responsibility can be accepted for errors or omissions.21
Technical section22
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Care and maintenanceHow to handle bearingsRolling Bearings are high precision machine parts and need to be handled carefully.24Keep Bearings AndSurroundings Clean!Handle With Care!Protect BearingsFrom Corrosion!Use Proper Tools!
Importance of proper fitsIn the case of a rolling bearing with theinner ring fitted to the shaft withinsufficient interference, a harmfulcircumferential slipping may occurbetween the inner ring and shaft. Thisslipping of the inner ring, which is called„creep”, results in a circumferentialdisplacement of the ring relative tothe shaft if the interference fit is notsufficiently tight. When creep occurs, thefitted surfaces become abraded, causingwear and considerable damage to theshaft.housing. Creep cannot always be eliminatedusing only axial tightening throughoutthe bearing ring faces. Generally, it is notnecessary, however, to provide interferencefor rings subjected only to stationary loads.Fits are sometimes made without anyinterference for either the inner or outerring, to accommodate certain operatingconditions, or to facilitate mounting anddismounting. In this case, to preventdamage to the fitting surfaces due tocreep, lubrication or other applicablemethods should be considered.It is important to prevent creep by havingsufficient interference to firmly securethat ring which rotates to either shaft or25
Loading conditions and tingrotating
LoadApplicationBearing OperationLoadConditionsInner RingOuter Ring1. Load stationaryRotatingStationaryRotating InnerRing Load2. Load rotatingStationaryRotatingStationary Outer RingLoad3. Load stationaryStationaryRotatingRotating OuterRing Load4. Load rotatingRotatingStationaryStationary Inner RingLoadDirection of loadindeterminatedue to variationof direction orunbalanced loadRotating orStationaryRotating orStationaryDirection of LoadIndeterminateFitsInner RingOuter RingTight FitLoose FitLoose FitTight FitTight FitTight Fit27
Fits between Radial Bearings and Housing BoresLoad ConditionsHeavy loads on bearing inthin-walled housing orheavy shock loadsRotatingOuter RingLoadSolidHousingDirectionof LoadIndeterminateNormal or heavy loads28RotatingInner RingLoadAutomotive wheel hubs(Roller bearings), cranetravelling wheelsAutomotive wheel hubs(Ball bearing), vibratingscreensLight or variable loadsConveyor rollers, ropesheaves, tension pulleysHeavy shock loadsTraction motorsNormal or heavy loadsNormal or light loadsSolid or SplitHousingExamplesPumps, crankshaft, mainbearings, medium andlarge motorsTolerancesforHousing BoresAxialDisplacement ofOuter RingRemarksImpossible–K7ImpossibleIf axial displacementof the outer ring is notrequiredJS7 (J7)PossibleAxial displacement ofouter ring is necessaryEasily Possible–P7N7M7Loads of all kindsGeneral bearingapplications, railwayaxleboxesH7Normal or high loadsPlummer blocksH8High temperature rise ofinner ring throug shaftPaper dryersG7
Load ConditionsRotatingInner RingLoadExamplesTolerancesforHousing BoresGrinding spindle rear ballbearings, high-speedcentrifugal compressorfree bearingsJS6 (J6)Grinding spindle front ballbearings, high-speedcentrifugal compressorfixed bearingsK6ImpossibleM6 or N6ImpossibleH6Easily PossibleAxialDisplacement ofOuter RingRemarksPossibleAccurate runningdesirable under normalor light loadsSolidHousingsDirectionof LoadIndeterminateAccurate running and high Cylindrical roller bearingsrigidity desirable underfor machine tool mainvariable loadsspindleFor heavy loads,inter ference fit tighterthan K is used. Whenhigh accuracy isrequired, very stricttolerances should beused for fittingRotatingInner RingLoadMinimal noise is requiredElectrical homeappliances–29
Fits between Radial Bearings and ShaftsLoad conditionsExamplesRadial Bearings with cylindrical boresEasy axial displacement of inner ring on shaftdesirableWheels on stationary axlesEasy axial displacement of inner ring on shaftunnecessaryTension pulleysrope sheavesLight loads or variable Loads( 0.06 Cr)Electrical home appliances, pumps, blowers,transport vehicles, precision machinery,machine toolsNormal loads(0.06 to 0.13 Cr)General bearing applications, medium andlarge motors, turbines, pumps, engine mainbearings, gears, woodworking machineRotating Outer Ring LoadRotating Inner Load or Direction ofLoad Indeterminate30
Shaft Diameter (mm)Cylindrical roller bearings,tapered roller bearingsBall bearingsSpherical rollerbearingsToleranceof shaftRemarksRadial Bearings with cylindrical boresg6All Shaft Diametersh6 18––js518 100 40–js6 (j6)100 20040 140–k6–140 200–m6js5-6 (j5-6) 18––18 100 40 40k5-6100 14040 10040 65m5-6140 200100 14065 100m6200 280140 200100 140n6–200 400140 280p6––280 500r6–– 500r7Use g5 and h5 where accuracy is required.In case of large bearings, f6 can be used toallow easy axial movement–k6 and m6 can be used for single-row taperedroller bearings and single-row angular contactball bearings instead of k5 and m531
Fits between Radial Bearings and ShaftsLoad conditionsExamplesRadial Bearings with cylindrical boresRotating Inner Load or Direction ofLoad IndeterminateHeavy loads or shock loads( 0.13 Cr)Railway axleboxes, industrial vehicles,traction motors, construction, equipment,crushersAxial Loads OnlyRadial Bearings with tapered bores and sleevesGeneral bearing applications, railway axleboxesAll Types of LoadingTransmission shafts, woodworking spindles32
Shaft Diameter (mm)Cylindrical roller bearings,tapered roller bearingsBall bearingsSpherical rollerbearingsToleranceof shaftRemarksRadial Bearings with cylindrical bores–50 14050 100n6–140 200100 140p6– 200140 200r6––200 500r7All Shaft Diametersjs6 (J6)Radial internal clearance greater than CNis necessary.–Radial Bearings with tapered bores and sleevesh9/IT5IT5 and IT7 mean that the deviation of the shaftfrom its true geometric from, e.g.roundnes and cylindricity should be withinthe tolerances of IT5 and IT7 respectively.All Shaft Diametersh10/IT733
Tolerances for Shaft DiametersRadial BearingBore Diameter(excludingtapered rollerbearings)DiameterClassification (mm)over34incl.d6e6f6g5g6h5h6h7h8h9h10js5js6360-8- 30- 38- 20- 28- 10- 18-4-9-4- 120-50-80- 120- 180- 300- 48 2.5 46100-8- 40- 49- 25- 34- 13- 22-5- 11-5- 140-60-90- 150- 220- 360- 58 3 4.510180-8- 50- 61- 32- 43- 16- 27-6- 14-6- 170-80- 110- 180- 270- 430- 70 4 5.518300- 10- 65- 78- 40- 53- 20- 33-7- 16-7- 200-90- 130- 210- 330- 520- 84 4.5 6.530500- 12- 80- 96- 50- 66- 25- 41-9- 20-9- 250-110- 160- 250- 390- 620-100 5.5 850800- 15- 100- 119- 60- 79- 30- 49- 10- 23- 10- 290- 130- 190- 300- 460- 740- 120 6.5 9.5801200- 20- 120- 142- 72- 94- 36- 58- 12- 27- 12- 340- 150- 220- 350- 540- 870- 140 7.5 11
j5j6j7k5k6k7m5m6n6p6r6r7DiameterClassification (mm)overincl. 3-2 6-2 8-4 6 1 9 1 13 1 9 4 12 4 16 8 20 12 23 15 27 1536 4-2 7-2 10-5 7 1 10 1 16 1 12 6 15 6 19 10 24 15 28 19 34 19610 5-3 8-3 12-6 9 1 12 1 19 1 15 7 18 7 23 12 29 18 34 23 41 231018 5-4 9-4 13-8 11 2 15 2 23 2 17 8 21 8 28 15 35 22 41 28 49 281830 6-5 11-5 15- 10 13 2 18 2 27 2 20 9 25 9 33 17 42 26 50 34 59 343050 6-7 12-7 18- 12 15 2 21 2 32 2 24 11 30 11 39 20 51 32 60 41 71 41 62 43 73 435080 6-9 13-9 20- 15 18 3 25 3 38 3 28 13 35 13 45 23 59 37 73 51 86 51 76 54 89 548012035
Tolerances for Shaft DiametersDiameterClassification (mm)over36incl.Radial BearingBore Diameter(excludingtapered 0- 25- 145- 170- 85- 110- 43- 68- 14- 32- 14- 390- 180- 250- 400- 630- 1000- 160 9 12.51802500- 30- 170- 199- 100- 129- 50- 79- 15- 35- 15- 440- 200- 290- 460- 720- 1150- 185 10 14.52503150- 35- 190- 222- 110- 142- 56- 88- 17- 40- 17- 490- 230- 320- 520- 810- 1300- 210 11.5 163154000- 40- 210- 246- 125- 161- 62- 98- 18- 43- 18- 540- 250- 360- 570- 890- 1400- 230 12.5 18
j5j6j7k5k6k7m5m6n6p6DiameterClassification (mm)r6r7 88 63 103 63120140 90 65 105 65140160 93 68 108 68160180 106 77 123 77180200 109 80 126 80200225 113 84 130 84225250 126 94 146 94250280 130 98 150 98280315 144 108 165 108315355 150 114 171 114355400over 7- 11 7- 13 14- 11 16- 13 7- 16 16 7- 18 18 22- 18 25- 21 26 29- 28 21 3 24 4 28 3 33 4 43 3 50 4 33 15 37 17 40 15 46 17 52 27 60 31 68 43 79 50 27 4 36 4 56 4 43 20 52 20 66 34 88 56 29 4 40 4 61 4 46 21 57 21 73 37 98 62incl.37
Tolerances for Housing Bore DiametersRadial BearingOutsideDeviation(excludingtapered rollerbearings)DiameterClassification (mm)over38incl.E6F6F7G6G7H6H7H8J6J7JS6JS7 910180-8 43 32 27 16 34 16 17 6 24 6 110 180 270 6-5 10-8 5.518300-9 53 40 33 20 41 20 20 7 28 7 130 210 330 8-5 12-9 6.5 10.530500- 11 66 50 41 25 50 25 25 9 34 9 160 250 390 10-6 14- 11 8 12.550800- 13 79 60 49 30 60 30 29 10 40 10 190 300 460 13-6 18- 12 9.5801200- 15 94 72 58 36 71 36 34 12 47 12 220 350 540 16-6 22- 13 11 17.5120150150180018-0- 25 110 85 68 43 83 43 39 14 54 14 250 400 630 18-7 26 12.5- 14 201802500- 30 129 100 79 50 96 50 44 15 61 15 290 460 720 22-7 30 14.5- 16 232503150- 35 142 110 88 56 108 56 49 17 69 17 320 520 810 25-7 36- 16 26 16 15
K5K6K7M5M6M7N5N6N7P6P7DiameterClassification (mm)overincl. 2-6 2-9 6- 12-4- 12-4- 150- 18-9- 17-9- 20-5- 23- 15- 26- 11- 291018 1-8 2- 11 6- 15-5- 14-4- 170- 21- 12- 21- 11- 24-7- 28- 18- 31- 14- 351830 2-9 3- 13 7- 18-5- 16-4- 200- 25- 13- 24- 12- 28-8- 33- 21- 37- 17- 423050 3- 10 4- 15 9- 21-6- 19-5- 240- 30- 15- 28- 14- 33-9- 39- 26- 45- 21- 515080 2- 13 4-8 10- 25-8- 23-6- 280- 35- 18- 33- 16- 38- 10- 45- 30- 52- 24- 5980120 3- 15 4- 21 12- 28-9- 27-8- 330- 40- 21- 39- 20- 45- 12- 52- 36- 61- 28- 68120180 2- 18 5- 24 13- 33- 11- 31-8- 370- 46- 25- 45- 22- 51- 14- 60- 41- 70- 33- 79180250 3- 20 5- 27 16- 36- 13- 36-9- 410- 52- 27- 50- 25- 57- 14- 66- 47- 79- 36- 8825031539
Mounting of Cylindrical Bore Bearings with interence fitBearing rings should not be subjected to direct impact – use a tubular driftor hydraulic press! Always apply the mounting force to the correct ring!Fitting bearing into housingFitting bearing to shaftSleeveHousing40Sleeve
Damage can occur if the mounting force is applied to the incorrect ring during assembly.In particular, the balls or raceways may become indented, also known as ”brinelling“.41
Mounting of Cylindrical Roller BearingsEnsure that the bearing is correctlyaligned to the shaft/housing.42Avoid shock loading on theinner/outer ring ribs.
Fractured rings, due to shock loading during fitting43
Shrink fitsShrink fitting is often used to avoid thelarge force involved in press fitting largebearings. For shrink fitting, the bearingsare first heated in oil, or in an inductionheater, to expand them, then mounted andallowed to cool. This amount of expansionof the inner ring for various temperaturedifferences and bearing sizes are shownin Fig. 1.Some precautions should be consideredwhen using shrink fits:- Do not heat bearings above 120 C- Put bearings on a wire netting or suspendthem in the oil tank to prevent them fromtouching the tank bottom.- Heat bearing to a temperature 20 to 30 Chigher than the lowest temperaturerequired for mounting, because the innerring will cool a little during mounting.44
Heating bearing oilOil 90–99 CWater 100 C220era200Bore expansion, δTe60mp180r6 CtuΔT re D 8 iffe0 C rence70 Cμm24050160 C40Induction heaterp6 C14030120100 Cn6m520 C80k560j5402080120Fig. 1180250315Bore diameter, d40050 0mm45
Shrink fitsAfter mounting, the bearings will shrink in the axial direction as well as the radial directionwhile cooling. Therefore, while mounting, press the bearing firmly against the shaft shoulderto avoid excessive clearance between the bearing and the shoulder.46
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Mounting of Spherical Roller Bearingson adapter sleeves1. With bearing on bench check clearanceusing the feeler gauges over the top ofthe rollers at the top of the bearing asshown in Fig. 1 and note the clearance.4. Open the sleeve slightly by insertingand twisting a screw driver into the slitin the sleeve and position the sleeve onthe shaft.2. Before mounting, smear the thread andthe side face of the nut with a molybdenum disulphide paste or similar lubricant.5. Slide bearing, lockwasher and locknutonto sleeve and tighten nut with a ‘C’spanner until all slackness is removed.3. Smear the shaft and outside diameter ofsleeve with a light oil.486. Further tighten the nut until the clearancehas been reduced by the amount shownin the chart on pages 54/55 but when thebearing is mounted on the shaft theclearance should be checked under therollers at the bottom of the bearing asshown in Fig. 2.
7. Check the clearance has not been reduced below the minimum permissibleresidual clearance shown in the charton pages 54/55 for the size and clearance of bearing.8. Align one tab on the lock washer witha slot in the locknut and bend it intothe slot, if no tabs line up with the slotsslightly tighten the locknut until onelines up. Never back off the nut to lineup the tab with the slot.9. Check the bearing rotates freely withoutany binding.49
Mounting of Spherical Roller Bearingson adapter sleevesFig. 1:Checking bearing clearance with bearing on bench.50
Fig. 2:Checking bearing clearance with bearing mounted on shaft.51
Mounting of Spherical Roller Bearingson an adapter sleeve using the Axial Drive-Up Method1. B efore mounting, smear the thread andthe side face of the nut with a molybdenumdisulphide paste or similar lubricant.2. Smear the shaft and outside diameter ofsleeve with a light oil.3. Open the sleeve slightly by inserting andtwisting a screwdriver into the slit in thesleeve and position the sleeve on theshaft.4. Slide bearing, lockwasher and locknutonto sleeve and tighten nut with a ‘C’spanner until all slackness is removed.525. Measure dimension ‘X’ as shown in Fig. 3.6. Tighten the nut and decrease dimension‘X’ by the amount of axial drive-up shownin the chart on pages 54/55 for the correctsize of bearing.7. Check bearing clearance as shown onpages 50/51 to ensure the clearance isnot less than the minimum permissibleresidual clearance shown in the chart onpages 54/55 for the size and clearance ofbearing.
8. Align one tab on the lock washer witha slot in the locknut and bend it intothe slot, if no tabs line up with the slotsslightly tighten the locknut until one linesup. Never back off the nut to line upthe tab with the slot.x9. Check the bearing rotates freely withoutbinding.Fig. 353
Mounting of Spherical Roller Bearingson an adapter sleeve (dimensions in mm) Taper 1:12Bearing BoreDiameter mm54overincl.30Reductionin RadialClearanceInitial Radial Internal ClearanceCNC3C4Axial Drive-Upmaxmin0.0850.250.0300.400.45100 0.0100.250.0350.0800.1000.0300.0350.450.55120 0.0150.0300.0450.0950.1200.0300.0350.450.5590 0 0.0300.0400.075140 .0950.095nominalMinimum PermissibleResidual .001.300.0600.1000.150
Bearing BoreDiameter mmoverincl.160Reductionin RadialClearanceInitial Radial Internal ClearanceCNC3C4Axial 3150.2400.3303153550.2703554000.300nominalMinimum PermissibleResidual ClearanceCNminmaxNominaltighteningangle55
Mounting of Self-Aligning Ball Bearingson an adapter sleeveAxia
Standard Bearings – Interchange Bearing Type Manufacturer FAG SKF SNR NTN NSK Single row Deep Groove Ball Bearings 600-6000-6200-6300-6400 Series 1 or 2 shields ZR/2ZR Z/2Z Z/ZZ Z/ZZ Z/ZZ 1 or 2 contact seals RSR/2RSR RS1/2RS1 E/EE LU/LLU DU
