Keyless Bushing Flange Type Not Applicable For Bore Diameter 2 1/2 in Keyless Bushing Type Multi-Screw Locking Assembly Material Steel Outside Diameter 3 47/64 in Overall Width 2.598 in System of Measurement Inch Finish Oil Dipped Hub Contact Pressure 18 822 psi Maximum Transmitted Torque 4 789 ft-lb