Keyless Bushing Flange Type Not Applicable For Bore Diameter 1/2 in Keyless Bushing Type Single Nut Locking Assembly Material Steel Outside Diameter 7/8 in Overall Width 1 in System of Measurement Inch Finish Oil Dipped Hub Contact Pressure 17 864 psi Maximum Transmitted Torque 737 ft-lb Outside Diameter Tolerance +/-0.0015