Thomson 60 Case LinearRace shafting is manufactured to the highest quality standards. Using 60 Case® LinearRace shafting with Thomson Ball Bushing bearings ensures optimal bearing performance and travel life.Available 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 .000080" for Class L, S, D, M and .000050" for Class N.Straight within .001" per foot cumulative when shipped from the factory.All Predrilled Shafting contains Standard Y Dimensions (Y1=Y2). The Y dimension is the distance from the center of the predrilled hole(s) nearest the end(s) of the shaft.SpecificationsSpecificationValueShaft TypeNo OptionMaterial, Shaft1566 Carbon SteelSurface Finish8 Ra microinch MaxTolerance ClassClass LHardness60 Rockwell C Min.Straightness0.001 in per Foot Cumulative (.002 in TIR)Length5,131 mm / 202 inDiameter64 mm / 2.500 inCase Depth, Minimum2.540 mm / 0.100 inRoundness0.00203 mm / 0.00008 inTaper0.0025 mm / 0.0001 in