Tire Coupling Hub Angular Misalignment 4 Degrees Coupling Size WE4 Horsepower @ 100 RPM 0.88 hp Maximum Speed 7 500 RPM Bore Type Round For Bushing Size Not Applicable Maximum Torque 550 in-lb Keyway Depth Not Applicable Keyway Width Not Applicable Hub Diameter 2.6 in Parallel Misalignment 0.0625 in Bore Diameter 5/8 in Screw Thread Size 3/8 In.-16 Set Screw Location Inside System of Measurement Inch Torsional Stiffness 5 370 in-lb/rad Length through Bore 1 11/16 in