Traditional cost effective rigid coupling design. Provides torque transmission and alignment. The keyway gives you a more secure hold and are especially good for alternating motion applications. They have standard ANSI keyway dimensions.Set-Screw-Couplings_Keyway.jpg
These shaft couplings feature high axial load and torque capacity. The clamping style does not mar your expensive shafts since set screws don't actually come into contact with the shaft.onepiececl.jpg