Keyless Bushing Flange Type Not Applicable For Bore Diameter 32 mm Keyless Bushing Type Single Nut Locking Assembly Material Steel Outside Diameter 51 mm Overall Width 57.2 mm System of Measurement Metric Finish Zinc Plated Hub Contact Pressure 16 243 psi Maximum Transmitted Torque 407 ft-lb Outside Diameter Tolerance +0.003 in