Crescent Rings | McMaster-Carr

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Low-Clearance Side-Mount External Retaining Rings

Also known as C-style and crescent rings, these rings have a small shoulder to fit in tight spaces.

Side-Mount External Retaining Rings

Also known as E-style rings.

Bowed Side-Mount External Retaining Rings

Also known as bowed E-style rings, these have a curved design that works like a spring, taking up play for a tight hold.

Wide-Grip Side-Mount External Retaining Rings

Also known as poodle rings, these thick rings have "ears" that form a large retaining surface to withstand stronger forces than other side-mount retaining rings.

Heavy Duty Side-Mount External Retaining Rings

These rings are reinforced to withstand faster rotation than other side‐mount retaining rings. Also known as reinforced E‐style rings.

Heavy Duty Spiral External Retaining Rings

Thicker than standard spiral rings, these rings withstand greater forces.

Spiral External Retaining Rings

These coiled rings can be wound into place on a shaft without tools.

Single-Turn Spiral External Retaining Rings

Slide these rings into place with one twist—no tools required—for applications with high thrust loads.

Spiral Internal Retaining Rings

These coiled rings can be wound into place inside a bore or housing without tools.

Heavy Duty Spiral Internal Retaining Rings

Thicker than standard spiral rings, these rings withstand greater forces.

Single-Turn Spiral Internal Retaining Rings

Slide these rings into place by hand with a single twist for applications with high thrust loads.

External and Internal Spiral
Retaining Ring Assortments

Wind these retaining rings into a groove—no tools required for installation.

Side-Mount Retaining Ring Tools

E-Style Side-Mount Retaining Ring Installation Tools

Slide the retaining ring in between the jaws of the tool and push the ring onto a shaft.

E- and C-Style Side-Mount Retaining
Ring Installation and Removal Tools

The spring on one end of the tool holds the retaining ring in position for installation and the hook on the other end is for removal.