Fits and Clearances - bearing

1 Ref: FCPG/C/E/E/ in EnglandPocket GuideFits and ClearancesUKNSK UK LTD.,NORTHERN ROAD, NEWARKNOTTINGHAMSHIRE,NG24 2 JFTel: +44/ 1636 605123 Fax: +44/ 1636 602775e-mail: FRANCE DE L EUROPE,2 RUE GEORGES GUYNEMER,78283 GUYANCOURT, CEDEXTel: +33/ 1 30 57 39 39 Fax: +33/ 1 30 57 00 01e-mail: DEUTSCHLAND GMBH,HARKORTSTRASSE 15,40880 RATINGENTel: +49/ 2102 4810 Fax: +49/ 2102 4812290e-mail: ITALIA GARIBALDI 215, 20024 GARBAGNATE,MILANESE (MI)Tel: +39/02 995 191 Fax: +39/02 990 25 778e-mail: ISKRA AND MARKETING OFFICE,UL. WARSZAWSKA 146, 25-547 KIELCETel: +48/ 41 330 38 07 Fax: +48/ 41 330 38 30e-mail: NORWAY OFFICE.,OSTRE KULLEROD 5,N-3241 SANDEFJORDTel: +47/ 3329 3160 Fax: +47/ 3342 9002e-mail: SPAIN, TARRAGONA, 161 CUERPO BAJO,2A PLANTA, 08014 BARCELONATel: +34 932 89 27 63 Fax: +34 934 33 57 76e-mail: RULMANLARI ORTA DO U TI.

2 ,YALI MAH. FEVZI CAKMAK CAD.,CAGLAR APT. NO 11/4,MALTEPE, ISTANBUL, 34844 Tel: +90/ 216 442 7106 Fax: +90/ 216 305 5505e-mail: JAPAN BLDF., 6-3,OHSAKI 1-CHOME SHINAGAWA-KU,TOKYO 141-8560 Tel: +81/ 03 3779 7680 Fax: +81/ 03 3779 7433 EUROPEAN SALES OFFICES AND JAPAN70424 F& 6/27/06 10:18 AM Page 11 Fits and Internal ClearancesFitsImportance of Proper FitsIn the case of a rolling bearing with the inner ring fitted to theshaft with only interference, a harmful circumferential slippingmay occur between the inner ring and shaft. This slipping ofthe inner ring, which is called creep , results in acircumferential displacement of the ring relative to the shaft ifthe interference fit is not sufficiently tight.

3 When creep occurs,the fitted surfaces become abraded, causing wear andconsiderable damage to the shaft. Abnormal heating andvibration may also occur due to abrasive metallic particlesentering the interior of the is important to prevent creep by having sufficient interferenceto firmly secure that ring which rotates to either shaft orhousing. Creep cannot always be eliminated using only axialtightening throughout the bearing ring faces. Generally, it is notnecessary, however, to provide interference for rings subjectedonly to stationary loads. Fits are sometimes made without anyinterference for either the inner or outer ring, to accommodatecertain operating conditions, or to facilitate mounting anddismounting.

4 In this case, to prevent damage to the fittingsurfaces due to creep, lubrication or other applicable methodsshould be F& 6/27/06 10:31 AM Page 13 LoadConditionsFitsInner RingOuter RingInner RingOuter RingBearing OperationRotatingStationaryStationaryRot atingRotating InnerRing LoadStationary OuterRing LoadLoose FitTight FitStationaryRotatingRotatingStationaryR otating OuterRing LoadStationary InnerRing LoadTight FitLoose FitRotating orStationaryRotating orStationaryDirection ofLoadIndeterminateTight FitTight Fit70424 F& 6/27/06 10:31 AM Page 32 Fits and Clearances Pocket GuideLoading Conditions and FitsLoad ApplicationDirection of load indeterminate due to variation of direction or unbalanced loadLOADS tationaryLOADR otatingLOADS tationaryLOADR otating70424 F& 6/27/06 10:31 AM Page 25 Tolerances forHousing BoresAxial Displacement of Outer RingRemarksP7N7 ImpossibleGenerallyImpossibleIf axial displacement of the outer ring is not required.

5 For heavy loads, interferencefit tight than K is used. Whenhigh accuracy is required,verystrict tolerances should beused for fitting. M7K7 PossibleAxial displacement of outer ring is (J7)Easily PossiblePossibleImpossibleEasily PossibleH7H8G7JS6 (J6)GenerallyImpossibleK6M6 or N6H670424 F& 6/27/06 10:31 AM Page 54 Fits and Clearances Pocket GuideFits between Radial Bearings and Housing BoresExamplesSolid HousingsSolid or SplitHousingsSolidHousingsRotating OuterRing LoadDirection ofLoadIndeterminateRotating InnerRing LoadRotating InnerRing LoadDirection ofLoadIndeterminateHeavy Loads on bearing in Thin-Walled Housing orHeavy Shock LoadsAutomotive Wheel Hubs(Roller Bearings) CraneTravelling WheelsNormal or Heavy LoadsAutomotive WheelHubs (Ball Bearings)

6 ,Vibrating ScreensLight or Variable LoadsConveyor Rollers,Rope Sheaves,Tension PulleysHeavy Shock LoadsTraction MotorsLoad ConditionsNormal or Heavy LoadsNormal or Light LoadsPumps, CrankshaftMain Bearings,Medium and LargeMotorsLoads of all KindsGeneral BearingApplications,Railway AxleboxesNormal or High LoadsPlummer BlocksHigh Temperature Rise ofInner Ring Through ShaftAccurate Running Desirable under Normal or Light LoadsAccurate Running and High Rigidity Desirable under Variable LoadsMinimum noise is requiredPaper DryersGrinding Spindle RearBall Bearings, High-Speed CentrifugalCompressor FreeBearingsGrinding Spindle FrontBall Bearings, High-Speed CentrifugalCompressor FixedBearingsCylindrical RollerBearings for MachineTool Main SpindleElectrical HomeAppliancesRemarks table is applicable to cast iron and steel housings.

7 For housingsmade of light alloys, the interference should be tighter than in this applicable to special F& 6/27/06 10:31 AM Page 47 Shaft Diameter (mm)ToleranceofShaftRemarksBallBearingsC ylindricalRollerBearings,TaperedRollerBe aringsSphericalRollerBearings CYLINDRICAL BORESAll Shaft DiametersAll Shaft DiametersUse g5 and h5 whereaccuracy is case of large bearings,f6 can be used to allow easy axial and m6 can be used forsingle-row tapered rollerbearings and single-rowangular contact ball bearingsinstead of k5 and than CNbearing internalclearance is necessary. g6h6<18 js518~100<40 js6 (j6)100~20040~140 k6 140~200 m6<18 js5 (j5-6)18~100<40<40k5-6100~14040~10040~65 m5-6140~200100~14065~100m6200~280140~200 100~140n6 200~400140~280p6 50~14050~100n6 140~200100~140p6 Over 200140~200r6 200~500r7js6 (j6)H9/IT5H10/IT7 280~500r6 over 500r7 TAPERED BORES AND SLEEVESAll Shaft DiametersIT5 and IT7 mean that thedeviation of the shaft from its true geometric from, and cylindricityshould be within thetolerances of IT5 and F& 6/27/06 10.

8 31 AM Page 76 Fits and Clearances Pocket GuideFits between Radial Bearings and ShaftsLoad ConditionsExamplesRADIAL BEARINGS WITHR otating Outer Ring LoadRotating Inner Ring Load or Direction of LoadIndeterminateLight Loadsor Variable Loads(< )Heavy Loadsor Shock Loads(< )Normal Loads ( to Cr)Electrical Home Appliances,Pumps, Blowers,Transport Vehicles, Precision Machinery, Machine ToolsGeneral bearing Applications,Medium and Large Motors,Turbines, Pumps,Engine Main Bearings,Gears,Woodworking MachinesRailway Axleboxes,Industrial Vehicles, Traction Motors,Construction,Equipment,CrushersGe neral bearing Applications,Railway AxleboxesTransmission Shafts,Woodworking SpindlesAxial Loads OnlyAll Types of LoadingRemarksThis table is applicable only to solid steel shaftsEasy axial displacement of inner ring on shaft desirableWheels on Stationary AxlesEasy axial displacement ofinner ring on shaft unnecessaryTension PulleysRope SheavesRADIAL BEARINGS WITH70424 F& 6/27/06 10.

9 31 AM Page 69+ 3+ 6+ 8+ 6+ 9+13+ 9+ 12+ 16+ 20+ 23+ 2736 2 2 4+ 1+ 1+ 1+ 4+ 4+ 8+ 12+ 15+ 15+ 4+ 7+10+ 7+10+ 16+12+ 15+ 19+ 24+ 28+ 34610 2 2 5+ 1+ 1+ 1+ 6+ 6+ 10+ 15+ 19+ 19+ 5+ 8+12+ 9+12+ 19+15+ 18+ 23+ 29+ 34+ 411018 3 3 6+ 1+ 1+ 1+ 7+ 7+ 12+ 18+ 23+ 23+ 5+ 9+13+11+15+ 23+17+ 21+ 28+ 35+ 41+ 491830 4 4 8+ 2+ 2+ 2+ 8+ 8+ 15+ 22+ 28+ 28+ 6+11+15+13+18+ 27+20+ 25+ 33+ 42+ 50+ 593050 5 5 10+ 2+ 2+ 2+ 9+ 9+ 17+ 26+ 34+ 34+ 60+ 715065+ 6+12+18+15+21+ 32+24+ 30+ 39+ 51+ 41+ 41 7 7 12+ 2+ 2+ 2+11+ 11+ 20+ 32+ 62+ 736580+ 43+ 43+ 73+ 8680100+ 6+13+20+18+25+ 38+28+ 35+ 45+ 59+ 51+ 51 9 9 15+ 3+ 3+ 3+13+ 13+ 23+ 37+ 76+ 89100120+ 54+ 54+ 88+103120140+ 63+ 63+ 7+14+22+21+28+ 43+33+ 40+ 52+ 68+ 90+105140160 11 11 18+ 3+ 3+ 3+15+ 15+ 27+ 43+ 65+ 65+ 93+108160180+ 68+ 68+106+123180200+ 77+ 77+ 7+16+25+24+33+ 50+37+ 46+ 60+ 79+109+126200225 13 13 21+ 4+ 4+ 4+17+ 17+ 31+ 50+ 80+ 80+113+130225250+ 84+ 84+126+146250280+ 7 16 26+27+36+ 56+43+ 52+ 66+ 88+ 94+ 94 16+ 4+ 4+ 4+20+ 20+ 34+ 56+130+150280315+ 98+ 98+144+165315355+ 7 18+29+29+40+ 61+46+ 57+ 73+ 98+108+108 18 28+ 4+ 4+ 4+21+ 21+ 37+ 62+150+171355400+114+114+166+189400450+ 7 20+31+32+45+ 68+50+

10 63+ 80+108+126+126 20 32+ 5+ 5+ 5+23+ 23+ 40+ 68+172+195450500+132+132+194+220500560 +44+ 70 + 70+ 88+122+150+15000+ 26+ 44+ 78+199+225560630+155+155+225+255630710 +50+ 80 + 80+100+138+175+17500+ 30+ 50+ 88+235+265710800+185+185+266+300800900 +56+ 90 + 90+112+156+210+21000+ 34+ 56+100+276+3109001 000+220+220+316+3551 0001 120 +66+105 +106+132+186+250+25000+ 40+ 66+120+326+3651 1201 250+260+260 +378+4251 2501 400 +78+125 +126+156+218+300+30000+ 48+ 78+140+408+4551 4001 600+330+330+462+5201 6001 800 +92+150 +150+184+262+370+37000+ 58+ 92+170+492+5501 8002 000+400+400 DiameterClassification (mm)Over F& 6/27/06 10:31 AM Page 98 Fits and Clearances Pocket GuideTolerances for Shaft Diameters360 30 20 10 4 4000000 4 8 38 28 18 9 12 5 8 12 18 30 486100 40 25 13 5 5000000 3 8 49 34 22 11 14 6 9 15 22 36 5810180 50 32 16 6 6000000 4 8 61 43 27 14 17 8 11 18 27 43 7018300 65 40 20 7 7000000 10 78 53 33 16 20 9 13 21 33 52 8430500 80 50 25 9 9000000 8 12 96 66 41 20 25 11 16 25 39 62 10050800 100 60 30 10 10000000 15 119 79 49 23 29 13 19 30 46 74 120801200 120