Shaft Coupler Body Coupling Size FC20 Outside Diameter 2 in Coupling Overall Length 3 11/16 in System of Measurement Inch Hub Material Carbon Steel Maximum Speed 3 450 RPM Keyway Depth 3/32 in Keyway Width 3/16 in Bore Diameter 7/8 in Shaft Locking Type Set Screw Bore Type Round Bore with Keyway Jaw Profile Straight Bore Tolerance +0.001/-0.000 in Hub Diameter 1 3/4 in