circlip

right|thumb|upright=1.5|Internal circlip thumb|upright=0.5|External circlip

A circlip (a portmanteau of "circle" and "clip"), also known as a C-clip, snap ring, or Jesus clip, is a type of fastener or retaining ring that consists of a semi-flexible metal ring with open ends that can be snapped into place into a machined groove on a dowel pin or other part to permit rotation but to prevent axial movement. There are two basic types of circlips: internal (fitted into a bore) and external (fitted over a shaft). Circlips are used to secure pinned connections.