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 1/8 in Keyway Width 1/4 in Bore Diameter 1 1/8 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