>> P.532
■Features■AccuracyIKO Needle Rollers are made of high carbon chromi-The dimensional accuracy of Needle Rollers conforms um bearing steel. They are rigid and highly accurate to JIS B 1506 (Rolling bearings-Rollers), and is shown and are finished to a hardness of 58HRC or more in Table 3. (See Table 1.) and a surface roughness of 0.1 μmRa or less.The selective classication for the mean diameter tol-erance is shown in Table 4. The selective classica-These needle rollers are widely used as rolling ele-tion rollers according to Table 4 can be provided as ments for bearings, and also as pins and shafts.requested.Please contact IKO, if Needle Rollers made of stain-less steel are required. Table 1 HardnessNominal diameterDw mmHardnessOver-3Incl.3-HRCHV(60〜67)697〜90058〜66(653〜865)Remarks1. ardness is at surface hardness.2. he values in parentheses are converted values for reference.■End ShapesNeedle Rollers come in spherical and at end shapes, as shown in Table 2. Please contact IKO, if other shapes are required.Table 3 Dimensional accuracy of needle rollersClassDiameter varia-tion in a single radial plane1)VDwp(Max.)23511.52Circularity1)Gauge lot diameter variation1)∆R(Max.)11.52.5VDwL(Max.)235unit: μmDeviation of a single length(2)∆Lwsh13h13h13Notes(1) pplicable to the measurement at the center of roller length (2) olerance is based on the classication according to the nominal length Lw. Remark ny measured diameter along the total length of roller must not be larger than the actual maximum diameter at the center of roller length by the amount exceeding the values given below.0.5μm for Class 20.8μm for Class 3 1 μm for Class 5Table 2 Shapes of endsTypeSpherical end Flat endTable 4 Classification of needle rollersunit: μmClassification symbolTolerance for mean dia.C 3B 2B 4B 6B 8B100〜- 30〜- 2-2〜- 4-4〜- 6-6〜- 8-8〜-10ShapesSymbolAFL23
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