Metric Retaining Rings | McMaster-Carr

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System of Measurement

Retaining Ring Type

Retaining Ring Style

Ring Thickness

Groove Diameter

Groove Width

Material

Ring OD

Ring ID

Finish

Zinc Yellow-Chromate Plated

Specifications Met

Color

Minimum Hardness

Thrust Load Capacity

10,000 lbf to 19,999 lbf

20,000 lbf to 99,999 lbf

100,000 lbf to 199,999 lbf

RoHS

Magnetic Properties

May Be Mildly Magnetic

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Passivation

Side-Mount External Retaining Rings Included

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)

Screw Size

Length

Width

976 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.

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.

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.

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.

Push-On External Retaining Rings

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

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.

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.

Inverted Internal Retaining Rings

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

Heavy Duty Internal Retaining Rings

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

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.

Retaining Ring 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.

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.

External, Internal, and Side-Mount
Retaining Ring Assortments

These assortments include pliers to install external and internal rings.

Internal Retaining Ring Assortments

Pull ring ends together with retaining ring pliers and place into the bore of a shaft or housing.