Constant Section Retaining Rings
Constant section retaining rings (snap rings) feature a uniform, constant section. In other words, the material used to make the ring is the same width at any point along the circumference of the ring. When they are contracted or expanded, they take on an elliptical deformation. As a result, they contact the groove at three or more isolated points but never continuously around the periphery. These rings are made from either flat or round wire.
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—Henry David Thoreau (1817–1862)