Tire Coupling Hub Angular Misalignment 3 Degrees Coupling Size WE50 Horsepower @ 100 RPM 12 hp Maximum Speed 4 200 RPM Bore Type Round For Bushing Size Not Applicable Maximum Torque 7 650 in-lb Keyway Depth Not Applicable Keyway Width Not Applicable Hub Diameter 8.13 in Parallel Misalignment 0.09375 in Bore Diameter 1 1/8 in Screw Thread Size 5/8 In.-11 Set Screw Location Inside System of Measurement Inch Torsional Stiffness 123 000 in-lb/rad Length through Bore 2 3/4 in