For use with needle roller BearingsAvailable from stock and cut to length in most material types and options.Centerless ground for an industry leading cataloged surface finish of 8 Ra max.Roundness within .000050"Straight within .001" per foot cumulative when shipped from the factory.SpecificationsSpecificationsValueCase Depth, Minimum0.100 inClassClass NHardness60 Rockwell C Min.MaterialSteelMaterial, ShaftSteelRoundness0.000050 inStraightness0.001 in per Foot Cumulative (.002 in TIR)Surface Finish8 Ra microinch MaxTaper0.0001 inUPC Number662486922599Weight2.003 lb/inDimensionsDimensionValue[d] Shaft, Nominal Diameter3 inActual Diameter2.9996 / 3.0000 in