Snap Rings | McMaster-Carr

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

REACH Compliant

	Passivation Passivation

Passivated

Not Passivated

	Fitting Type Fitting Type


Snap	Carabiner

Link/Ring	Shackle

	Number of Pieces Number of Pieces

50
118
150
180
195
216
218
220

225
240
261
265
300
333
380
395

440
460
540
555
620
1,500

	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)

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2,905 Products

External Retaining Rings

Open these rings, pass them over the end of a shaft, and release to spring into the groove.

Heavy Duty External Retaining Rings

Thicker than standard external retaining rings, these rings withstand greater force.

Mil. Spec. External Retaining Rings

These rings meet military specification MS 16624.

Inverted External Retaining Rings

For a smooth profile and better clearance than standard external retaining rings, the lugs on these rings point inward.

Self-Locking External Retaining Rings

No groove is required for these rings—their thick profile helps them grip the shaft.

Bowed External Retaining Rings

The curved design of these rings works like a spring, taking up play for a tight hold.

Side-Mount External Retaining Rings

Also known as E-style 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.

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.

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.

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.

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.

Speared Ends External Retaining Rings

Often used with small engines, heavy equipment, and power transmission, these external retaining rings have speared ends to help you install and remove them.

Push-On External Retaining Rings

No groove required—press these rings onto the end of a shaft for a firm grip.

Push-On Retaining Caps

Use these caps to hold components in place and protect shaft ends.

Flanged Push-On External Retaining Rings

The wide flange provides better load distribution than standard external push rings and can be used to cover oversized holes. Also known as thread cutting nuts.

Rectangular Push-On External Retaining Rings

Also known as flat-style speed nuts, these have a large surface to distribute loads better than standard and flanged external push rings.

Crimp-On External Retaining Rings

Also known as X-washers, place these rings into the groove and squeeze tight with pliers to form a 360° closure.

Low-Clearance External Retaining Rings

Also known as constant-section rings, these rings have open ends and a profile that does not taper like other external retaining rings. Use them with linear bearings on support rail shafts.

Clip-On External Retaining Rings

Slide these rings into a groove near the end of the shaft and the tab locks them in place.

Internal Retaining Rings

Squeeze these rings to place them in the groove inside a bore or housing.

Heavy-Duty Internal Retaining Rings

Thicker and stronger than standard internal retaining rings, these withstand greater thrust loads.

Inverted Internal Retaining Rings

For a smooth bore and better clearance than standard internal retaining rings, the lugs on these rings face outward.

Bowed Internal Retaining Rings

The curved design of these rings works like a spring, taking up play for a tight hold.

Internal Teeth Retaining Rings

With teeth along the inside, these retaining rings hold chamfered shafts inside the housing of your equipment.

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.

Push-On Internal Retaining Rings

No groove required—these rings have teeth that firmly grip the bore.

Fastener Assortments

External Retaining Ring Assortments

Pull these rings open with retaining ring pliers, pass over the end of a shaft, and release to spring into a groove.

External and Side-Mount Retaining Ring Assortments

Assortments include pliers to install external rings.

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.