>> P.40
ClearanceThe clearances between the bearing rings and rolling elements are known as bearing clearances. When either the inner or outer ring is xed and a specied measuring load is applied to the free bearing ring inward and outward alternately in the radial direction, the displacement of the free bearing is referred to as the radial internal clearance. The amount of measur-ing load in this case is extremely small, and its values are specied in JIS B 1515-2 (Rolling bearings-Toler-ances-Part2:Measuring and gauging principles and methods).1Table 18 shows the radial internal clearances of Needle Roller Bearings with Inner Ring based on JIS B 1520 (Rolling bearings-Radial internal clearance). The radial internal clearances are classied into C2, CN, C3, C4, and C5, with clearances increasing in this order. CN is used under normal operating condi-tions. When a smaller range in radial internal clear-ance than the values shown in Table 18 is required, please consult IKO.2In the case of Shell Type Needle Roller Bearings, the correct dimensional accuracy is achieved only after the bearings are press-fitted into the specified housing bore. Therefore, the clearances shown in Table 18 are not applicable. See page B5.3For the radial internal clearances of Cam Followers, Roller Followers and Crossed Roller Bearings, see the relevant section for each bearing.Table 18 Radial internal clearances of Needle Roller Bearingsunit: μmdNominal bore diametermmC2CNC3C4C5Classification of clearancesOver ─ 10 24 30 40 50 65 80100120140160180200225250280315355400450Incl. 10 24 30 40 50 65 80100120140160180200225250280315355400450500Min.Max.Min.Max.Min.Max.Min.Max.0 0 0 5 5 1010 15 1515 20 2535 45 4555 55 6510011011025 25 2530 35 4045 50 5560 70 7590105110125130145190210220 20 20 2025 30 4040 50 5060 70 7590105110125130145190210220 45 45 4550 60 7075 85 9010512012514516517519520522528031033035 35 3545 50 6065 75 85100115120140160170190200225280310330 60 60 6070 80 9010011012514516517019522023526027530537041044050 50 5060 70 8090105125145165170195220235260275305370410440 7575 75 85100110125140165190215220250280300330350385460510550Min.─ 65 7080 95110130155180200225250275305330370410455510565625Max. ─ 90 95105125140165190220245275300330365395440485535600665735Remark For bearings with CN clearance, no symbol is attached to the identification number. In the case of bearings with C2, C3, C4 and C5 clearances, these symbols are attached to the identification number. ExampleNA4905C2A37
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