Each hub includes a set screw, which bites into your shaft to hold the coupling in place.

An acetal plastic spacer at the center of these couplings insulates bearings, encoders, and other shaft components from stray electric current. Use them with servomotors, which sometimes generate current that travels down the shaft and can damage circuit boards, interfere with readings, and cause wear on bearing raceways.

Commonly used to connect motors to driven machinery, pumps, and gearboxes, these couplings are suitable for continuous motion.