C-Rings | McMaster-Carr

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Minimum Hardness Minimum Hardness

Rockwell C34

	Specifications Met Specifications Met

ASME

DIN

	Passivation Passivation

Passivated

Not Passivated

	Ring ID Ring ID

	Side-Mount External Retaining Rings Included Side-Mount External Retaining Rings Included

For 1/16" OD (200 Pieces)

For 3/32" OD (300 Pieces)

For 7/64" OD (150 Pieces)

For 1/8" OD (30 Pieces)

For 1/8" OD (150 Pieces)

For 9/64" OD (100 Pieces)

For 5/32" OD (20 Pieces)

For 5/32" OD (100 Pieces)

For 11/64" OD
(100 Pieces)

For 3/16" OD (30 Pieces)

For 3/16" OD (55 Pieces)

For 3/16" OD (100 Pieces)

For 7/32" OD (20 Pieces)

For 7/32" OD (25 Pieces)

For 7/32" OD (50 Pieces)

For 7/32" OD (60 Pieces)

For 1/4" OD (25 Pieces)

For 1/4" OD (30 Pieces)

For 1/4" OD (50 Pieces)

For 1/4" OD (90 Pieces)

For 9/32" OD (25 Pieces)

For 5/16" OD (25 Pieces)

For 5/16" OD (30 Pieces)

For 5/16" OD (50 Pieces)

For 5/16" OD (75 Pieces)

For 3/8" OD (25 Pieces)

For 3/8" OD (30 Pieces)

For 3/8" OD (50 Pieces)

For 3/8" OD (85 Pieces)

For 7/16" OD (25 Pieces)

For 7/16" OD (50 Pieces)

For 7/16" OD (60 Pieces)

For 1/2" OD (20 Pieces)

For 1/2" OD (25 Pieces)

For 1/2" OD (40 Pieces)

For 1/2" OD (50 Pieces)

For 5/8" OD (15 Pieces)

For 5/8" OD (20 Pieces)

For 5/8" OD (25 Pieces)

For 5/8" OD (30 Pieces)

For 5/8" OD (40 Pieces)

For 3/4" OD (10 Pieces)

For 3/4" OD (15 Pieces)

For 3/4" OD (25 Pieces)

For 7/8" OD (5 Pieces)

For 7/8" OD (15 Pieces)

For 7/8" OD (20 Pieces)

For 63/64" OD (15 Pieces)

For 1 3/16" OD
(12 Pieces)

For 3 mm OD (20 Pieces)

For 3 mm OD (40 Pieces)

For 4 mm OD (20 Pieces)

For 4 mm OD (40 Pieces)

For 5 mm OD (20 Pieces)

For 5 mm OD (40 Pieces)

For 6 mm OD (20 Pieces)

For 6 mm OD (40 Pieces)

For 7 mm OD (20 Pieces)

For 7 mm OD (30 Pieces)

For 8 mm OD (20 Pieces)

For 8 mm OD (30 Pieces)

For 9 mm OD (20 Pieces)

For 10 mm OD
(10 Pieces)

For 10 mm OD
(20 Pieces)

For 11 mm OD
(20 Pieces)

For 12 mm OD
(10 Pieces)

For 13 mm OD
(10 Pieces)

For 16 mm OD (5 Pieces)

For 20 mm OD (5 Pieces)

	Number of Pieces Number of Pieces

	Clinched Diameter Clinched Diameter

956 Products

Retaining Rings

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.

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.

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.

Single-Turn Spiral External Retaining Rings

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

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 Internal Retaining Rings

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

Heavy Duty Spiral Internal Retaining Rings

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

Spiral Internal Retaining Rings

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

Fastener Assortments

Side-Mount External Retaining Ring Assortments

Also known as E-Style and C-style rings, slide these into the groove from the side of the shaft. They provide a wider shoulder than other external retaining rings for a larger retaining surface.