Shaft Coupler Body Coupling Size L095 Outside Diameter 2 7/64 in Coupling Overall Length 2 1/2 in System of Measurement Inch Hub Material Carbon Steel Maximum Speed 9 000 RPM Horsepower @ 100 RPM 0.3 hp (Buna-N Spider) 0.9 hp (Hytrel Spider) Keyway Depth 3/64 in Keyway Width 3/32 in Bore Diameter 7/16 in Shaft Locking Type Set Screw Bore Type Round Bore with Keyway Jaw Profile Straight Screw Thread Size 5/16-18 UNC Hub Diameter 2 7/64 in Hub Material Grade 1045