Shaft Coupler Body, Coupling Size L110, Outside Diameter 3 21/64 in, Coupling Overall Length 4 15/64 in, System of Measurement Inch, Hub Material Carbon Steel, Maximum Speed 5,000 RPM, Horsepower @ 100 RPM 1.26 hp (Buna-N Spider), 3.6 hp (Hytrel Spider), Keyway Depth 5/32 in, Keyway Width 5/16 in, Bore Diameter 1 3/8 in, Shaft Locking Type Set Screw, Bore Type Round Bore with Keyway, Jaw Profile Straight, Screw Thread Size 3/8-16 UNC, Hub Diameter 3 21/64 in, Hub Material Grade 1045