A shaft collar is a mechanical device that is used to secure objects to shafts, prevent shafts from moving or to adjust the position of shafts. There are several synonyms for the term shaft collar including clamp collar, set collar, split collar, and locking collar. Clamp collar is a collar that utilizes a clamp system to secure it onto a shaft. Set collar refers to a collar that is designed to be set on a particular position on a shaft. Split collar is a collar that has a split and uses screws or clamps to hold it in place, while Locking collar refers to a collar that locks into place using a mechanism such as a set screw or a snap ring.