Rigid Shaft Coupling Bore Diameter 1 5/8 in Bore Diameter 2 1/2 in Bore Type Round Keyed Clearance Diameter 1.51 in Coupling Construction Two-Piece Coupling Material Carbon Steel Coupling Outside Diameter 1 5/16 in Different Bore Sizes Yes Keyway Depth 1 3/32 in Keyway Depth 2 1/16 in Minimum Bore Diameter 1/2 in Keyway Width 1 3/16 in Keyway Width 2 1/8 in Maximum Bore Diameter 5/8 in Maximum Speed 4 000 RPM Maximum Torque 1 600 in-lb Overall Length 2 in