Keyless Bushing Flange Type Not Applicable For Bore Diameter 18 mm Keyless Bushing Type Single Nut Locking Assembly Material Steel Outside Diameter 38 mm Overall Width 38.1 mm System of Measurement Metric Finish Zinc Plated Hub Contact Pressure 32 487 psi Maximum Transmitted Torque 193 ft-lb Outside Diameter Tolerance +0.003 in