Shaft Coupler Body Coupling Size L190 Outside Diameter 4 1/2 in Coupling Overall Length 4 7/8 in System of Measurement Inch Hub Material Carbon Steel Maximum Speed 5 000 RPM Horsepower @ 100 RPM 2.7 hp (Buna-N Spider) 7.44 hp (Hytrel Spider) Keyway Depth 3/16 in Keyway Width 3/8 in Bore Diameter 1 1/2 in Shaft Locking Type Set Screw Bore Type Round Bore with Keyway Jaw Profile Straight Screw Thread Size 7/16-14 UNC Hub Diameter 4 in Hub Material Grade 1045