Ball and Roller Bearings

Bearing Fits(4) A particular type of fit is recommended for SL typecylindrical roller bearings.Table 7.2 General standards for radial bearing fits (JIS Class 0, 6X, 6)Table 7.2 (1) Tolerance class of shafts commonly used for radial bearings (classes 0, 6X and 6)Inner ring rotational load or loadof undetermined directionInner ringstatic loadConditions1Light loadorfluctuating loadOrdinaryloadHeavy load 1orimpact loadInner ring mustmove easilyover shaftInner does nothave to moveeasily over shaftCenter axial loadOverall load1Ball bearingsOver1810018100140200Under1810020018100140200280Cylindrical roller bearingTapered roller bearingShaft diameter (mm)4014040100140200501402004014020040100140200400140200Overall shaft diameterOverall shaft diameterOverall shaft diameterOverall shaft diameterSpherical roller bearingOver Under Over UnderCylindrical bore bearing (Classes 0, 6X and 6)4065100140280501001404065100140280500100140200Shafttoleranceclassh5js6k6m6js5k5m5m6n6p6r6n6p6r6Tapered bore bearing (class 0) (with adapter or withdrawal sleeve)g6h6js6RemarksWhen greater accuracy is requiredjs5, k5, and m5 may be substitutedfor js6, k6, and m6.Alteration of inner clearances toaccommodate fit is not a considerationwith single-row angular contactbearings and tapered roller bearings.Therefore, k5 and m5 may besubstituted for k6 and m6.Use bearings with larger internalclearances than CN clearance bearings.When greater accuracy is required use g5.For large bearings, f6 will suffice for tofacilitate movement.When greater accuracy isrequired use h5.Generally, shaft and inner ringsare not fixed using interferance.2 2h9/IT5 h10/IT7 will suffice for powertransmitting shafts.Table 7.2 (2) Fit with shaft (fits for tapered bore bearings (Class 0) with adapter assembly/withdrawal sleeve)All loadsAll bearing typesAll shaft diametersToleranceclass2h9 / IT52h10/IT71 Standards for light loads, normal loads, and heavy loadsLight loads: equivalent radial load 0.06CrNormal loads: 0.06Cr equivalent radial load 0.12CrHeavy loads: 0.12 Cr equivalent radial load2 IT5 and IT7 show shaft roundness tolerances, cylindricity tolerances, and related values.Note: All values and fits listed in the above tables are for solid steel shafts.General applicationsTransmission shafts, etc.A-51