Circlips
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Circlips, also known as snap rings, C-clips, or Jesus clips, are fasteners that consist 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. This allows rotation but prevents axial movement. Circlips are used to keep components fitted on shafts or housings and with bearings used for mechanisms that twist, spin, turn or pivot