Climax Part 2ISCC-125-100 Mild Steel, Black Oxide Plating Clamping Coupling, 1 1/4 Inch X 1 Inch Bore, 2 1/16 Inch OD, 3 1/4 Inch Length, 1/4-28 X 3/4 Clamp Screw: Clamp On Shaft Collars

Rigid Shaft Coupling, One Piece Clamp Type, With Keyway, Bore Dia. 1-1/4 In. x 1-1/4 In. ) 2-5/16, Screw Size (In. Effective on hard and soft shafts Design fully engages the shaft without marring High axial load and torque capacity Tolerance: +.003/-.000 Black oxide provides some corrosion resistance