Tire Coupling Hub Angular Misalignment 4 Degrees Coupling Size WE4 Horsepower @ 100 RPM 0.88 hp Maximum Speed 7 500 RPM Bore Type Round Keyed For Bushing Size Not Applicable Maximum Torque 550 in-lb Keyway Depth 5/32 in Keyway Width 5/16 in Hub Diameter 2.6 in Parallel Misalignment 0.0625 in Bore Diameter 1 3/8 in Screw Thread Size 1/4 In.-20 Set Screw Location Over Keyway System of Measurement Inch Torsional Stiffness 5 370 in-lb/rad Length through Bore 1 11/16 in