Retaining Ring Assortments

An external retaining ring seats into a groove cut into the outside of a shaft, creating a shoulder that retains a component from sliding off the shaft end. An internal retaining ring seats into a groove cut inside a bore or housing, retaining a component (like a bearing) from sliding out of the bore. The two styles use different pliers and groove geometries and aren't interchangeable.

An E-clip (E-ring) slides onto a shaft from the side into a shallow groove, rather than requiring the ring to be expanded and dropped over the shaft end like a standard external ring — making it useful where a shaft end is inaccessible or where a full circumferential groove isn't practical, such as retaining a small pin or roller near a shaft's midpoint.

A standard stamped retaining ring has lug ears (the tabs used by pliers to install/remove it) that create a stress concentration point and a slight gap in the ring, which can be a weak point under heavy or shock loading. A spiral retaining ring is wound from flat wire with no lug ears and no gap discontinuity, distributing load evenly around the full circumference — better suited to heavy axial loads or vibration.

No — even at similar nominal sizes, metric and SAE/inch retaining rings have different actual diameters and groove width tolerances, so a ring sized for a metric groove will not seat correctly in an inch-standard groove and vice versa. Always confirm which standard your equipment's groove was cut to before ordering.

Yes — external and internal retaining rings each require a dedicated plier style (external pliers squeeze the ring closed to install; internal pliers squeeze the ring closed to insert into a bore, since it must expand to seat) with tips sized to fit the ring's lug holes. Using an incorrectly sized or wrong-style plier risks bending the ring or slipping and improperly seating it, which can lead to the ring failing to retain the component.