Shaft Coupler Body Coupling Size L050 Outside Diameter 1 5/64 in Coupling Overall Length 1 23/32 in System of Measurement Inch Hub Material Carbon Steel Maximum Speed 18 000 RPM Horsepower @ 100 RPM 0.041 hp (Buna-N Spider) 0.08 hp (Hytrel Spider) Bore Diameter 1/4 in Shaft Locking Type Set Screw Bore Type Round Bore Jaw Profile Straight Screw Thread Size 1/4-20 UNC Hub Diameter 1 5/64 in Hub Material Grade 1045