Tire Coupling Hub Angular Misalignment 2 Degrees Coupling Size WE60 Horsepower @ 100 RPM 20 hp Maximum Speed 3 800 RPM Bore Type Round For Bushing Size Not Applicable Maximum Torque 12 500 in-lb Keyway Depth Not Applicable Keyway Width Not Applicable Hub Diameter 8.75 in Parallel Misalignment 0.125 in Bore Diameter 1 1/8 in Screw Thread Size 5/8 In.-11 Set Screw Location Inside System of Measurement Inch Torsional Stiffness 167 000 in-lb/rad Length through Bore 3 1/4 in