McMaster 60845K15 Two-Piece Shaft Coupling, Steel, for 7/8" x 7/8" Diameter Keyed Shaft

Install and remove these shaft couplings without disconnecting the shafts, motors, and other attached components—they’re made in two pieces so you don’t need to slide them onto shaft ends. They’re also useful when you have limited access to the ends of the shafts. These couplings clamp onto the shafts, creating a secure hold that won’t mar them. Good for high-torque applications, they have a rigid construction. However, their rigidity means these couplings can only connect shafts that are well aligned.

Black-Oxide Steel—Steel couplings are stronger and handle higher torque loads than aluminum and stainless steel couplings.

For Keyed Shafts — Couplings for keyed shafts have keyways that are cut to standard ANSI dimensions, so they fit snugly on ANSI keyed shafts to eliminate slipping during starts and stops.