Retaining Washers | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	For Screw Size For Screw Size

	Material Material

	For OD For OD

	OD OD

	ID ID

	Retaining Ring Style Retaining Ring Style

	Color Color

	Off-White		Black
	Blue		Gray
	Red		White

	Retaining Ring Type Retaining Ring Type

	External
	Internal

	Ring OD Ring OD

	For Groove Diameter For Groove Diameter

	Finish Finish

Black Phosphate

Zinc Plated

Zinc Yellow-Chromate Plated

Black Oxide

Zinc-Chromate Plated

Oil Coated

Corrosion-Resistant-Coated

Nickel Plated

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Ring Thickness Ring Thickness

	Minimum Thickness Minimum Thickness

	Maximum Thickness Maximum Thickness

	For Groove Width For Groove Width

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

REACH Compliant

	Height Height

	Magnetic Properties Magnetic Properties

Magnetic

May Be Mildly Magnetic

Nonmagnetic

	Minimum Hardness Minimum Hardness

	Minimum Temperature Minimum Temperature

760 Products

Fasteners

Self-Retaining Washers

A specially shaped ID grips your screw shank tightly.

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.

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.

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.

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.

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.

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.

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.

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.

Push-On Internal Retaining Rings

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

Round Push Nuts

With flexible teeth that slide smoothly over threads of any pitch, these push nuts can be used alone for light-duty applications or as a jam nut.

Metric Round Push Nuts

These metric push nuts can be used as a standalone for light-duty applications or as a jam nut.

Rectangular Push Nuts

Also known as flat-style speed nuts, these have large sides, so they're easy to push over threads by hand.

Rectangular Push Nuts for Tapping Screws

Flanged Push Nuts

A flange distributes the load over a large area and reduces stress where the nut meets the material surface.

Hex Speed Nuts

Hex speed nuts can be gripped with a wrench for ease of removal.

External, Internal, and Side-Mount
Retaining Ring Assortments

These assortments include pliers to install external and internal rings.

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.

Washer-Style Tag Holders

Bolt these holders to a surface and then attach a tag to the small hole.