Keyless Bushing Flange Type Not Applicable For Bore Diameter 55 mm Keyless Bushing Type Multi-Screw Locking Assembly Material Steel Outside Diameter 85 mm Overall Width 42.5 mm System of Measurement Metric Finish Oil Dipped Hub Contact Pressure 28 813.838 psi Maximum Transmitted Torque 139 ft-lb Outside Diameter Tolerance +0/-.002 in