>> P.40
A37Theclearancesbetweenthebearingringsandrollingelementsareknownasbearingclearances.Wheneithertheinnerorouterringisfixedandaspecifiedmeasuringloadisappliedtothefreebearingringinwardandoutwardalternatelyintheradialdirection,thedisplacementofthefreebearingisreferredtoastheradialinternalclearance.Theamountofmeasur-ingloadinthiscaseisextremelysmall,anditsvaluesarespecifiedinJISB1515-2(Rollingbearings-Toler-ances-Part2:Measuringandgaugingprinciplesandmethods).1Table18showstheradialinternalclearancesofNeedleRollerBearingswithInnerRingbasedonJISB1520(Rollingbearings-Radialinternalclearance).TheradialinternalclearancesareclassifiedintoC2,CN,C3,C4,andC5,withclearancesincreasinginthisorder.CNisusedundernormaloperatingcondi-tions.Whenasmallerrangeinradialinternalclear-ancethanthevaluesshowninTable18isrequired,pleaseconsultIKO.2InthecaseofShellTypeNeedleRollerBearings,thecorrectdimensionalaccuracyisachievedonlyafterthebearingsarepress-fittedintothespecifiedhousingbore.Therefore,theclearancesshowninTable18arenotapplicable.SeepageB5.3FortheradialinternalclearancesofCamFollowers,RollerFollowersandCrossedRollerBearings,seetherelevantsectionforeachbearing.Clearance─1024304050658010012014016018020022525028031535540045010243040506580100120140160180200225250280315355400450500000551010151515202535454555556510011011025252530354045505560707590105110125130145190210220202020253040405050607075901051101251301451902102204545455060707585901051201251451651751952052252803103303535354550606575851001151201401601701902002252803103306060607080901001101251451651701952202352602753053704104405050506070809010512514516517019522023526027530537041044075757585100110125140165190215220250280300330350385460510550─65708095110130155180200225250275305330370410455510565625─9095105125140165190220245275300330365395440485535600665735dNominalborediametermmClassificationofclearancesC2CNC3C4C5RemarkForbearingswithCNclearance,nosymbolisattachedtotheidentificationnumber.InthecaseofbearingswithC2,C3,C4andC5clearances,thesesymbolsareattachedtotheidentificationnumber.ExampleNA4905C2Table18RadialinternalclearancesofNeedleRollerBearingsOverIncl.Min.Max.Max.Max.Max.Max.Min.Min.Min.Min.unit:μm
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