Tire Coupling Hub Angular Misalignment 3 Degrees Coupling Size WE20 Horsepower @ 100 RPM 3.7 hp Maximum Speed 6 600 RPM Bore Type Round For Bushing Size Not Applicable Maximum Torque 2 300 in-lb Keyway Depth Not Applicable Keyway Width Not Applicable Hub Diameter 4.48 in Parallel Misalignment 0.09375 in Bore Diameter 7/8 in Screw Thread Size 3/8 In.-16 Set Screw Location Inside System of Measurement Inch Torsional Stiffness 27 600 in-lb/rad Length through Bore 2 1/16 in