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"Straight within .001" per foot cumulative when shipped from the factory.Y1 = Y2 unless specifiedPredrilled shafting designed for use with Open bearingsSpecificationsSpecificationsValueCase Depth, Minimum1.52 mmClassClass MM (h6)Hardness60 Rockwell C Min.MaterialSteelMaterial, ShaftSteelOption Predrilled (PD)PredrilledRoundness0.0020 mmStraightness0.0254 mm per Foot Cumulative (0.051 mm TIR)Surface Finish0.20 Ra µmTaper0.0025 mmWeight2.47 kg/mDimensionsDimensionValue[d] Shaft, Nominal Diameter20 mm[G]M6[X] Dim100 mmActual Diameter19.99 / 20.00 mm