Rigid Shaft Coupling Bore Diameter 1 3/8 in Bore Diameter 2 3/8 in Bore Type Round Keyed Clearance Diameter 1.03 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 7/8 in Different Bore Sizes No Keyway Depth 1 3/64 in Keyway Depth 2 3/64 in Minimum Bore Diameter 3/8 in Keyway Width 1 3/32 in Keyway Width 2 3/32 in Maximum Bore Diameter 3/8 in Maximum Speed 4 000 RPM Maximum Torque 475 in-lb Overall Length 1 3/8 in