Retaining Ring

A retaining ring is a split ring that fits into a groove on a shaft or in a bore to hold parts in place. It can be internal or external.

A retaining ring sits in a groove on a shaft or in a bore and holds a part against sideways movement. An external ring fits a shaft groove and an internal ring fits a housing groove. It is matched with a groove cut to the ring size and is usually fitted with circlip pliers.

Retaining rings are often made in alloy steel, stainless steel, or brass. Alloy steel gives high strength, while stainless steel resists corrosion.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance for the material and dimensions. On receipt, check the ring for cracks, correct diameter, and that it fits the groove without excessive play.