>> P.40
ClearancetotheloadisappliedTheclearancesbetweenthebearingringsandrollingelementsareknownasbearingclearances.Wheneithertheinnerorouterringisfixedandaspecifiedmeasuringfreebearingringinwardandoutwardalternatelyintheradialdirection,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.Table18RadialinternalclearancesofNeedleRollerBearingsunit:μmdNominalborediametermmC2CNC3C4C5ClassificationofclearancesOver─10243040506580100120140160180200225250280315355400450Incl.10243040506580100120140160180200225250280315355400450500Min.Max.000551010151515202535454555556510011011025252530354045505560707590105110125130145190210220Min.20202025304040505060707590105110125130145190210220Max.454545506070758590105120125145165175195205225280310330Min.353535455060657585100115120140160170190200225280310330Max.606060708090100110125145165170195220235260275305370410440Min.50505060708090105125145165170195220235260275305370410440Max.75757585100110125140165190215220250280300330350385460510550Min.─65708095110130155180200225250275305330370410455510565625Max.─9095105125140165190220245275300330365395440485535600665735RemarkForbearingswithCNclearance,nosymbolisattachedtotheidentificationnumber.InthecaseofbearingswithC2,C3,C4andC5clearances,thesesymbolsareattachedtotheidentificationnumber.ExampleNA4905C2A37
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