Shaft Coupler Body Coupling Size FC30 Outside Diameter 3 in Coupling Overall Length 5 15/32 in System of Measurement Inch Hub Material Carbon Steel Maximum Speed 3 450 RPM Keyway Depth 3/16 in Keyway Width 3/8 in Bore Diameter 1 7/16 in Shaft Locking Type Set Screw Bore Type Round Bore with Keyway Jaw Profile Straight Bore Tolerance +0.001/-0.000 in Hub Diameter 2 3/4 in