O-Ring Backups | McMaster-Carr

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	Material Material

Rubber

Plastic

	For Use With For Use With

	Construction Construction

Solid

Split

	Color Color

	Black		White
	Blue		Gray

	Hardness Hardness

	Maximum Temperature Maximum Temperature

	Hardness Rating Hardness Rating

Hard

Extra Hard

	Top Shape Top Shape

Contoured

Flat

	Minimum Temperature Minimum Temperature

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

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

REACH Compliant

	Seal ID Seal ID

	Seal OD Seal OD

	Seal Width Seal Width

	For Bore Diameter For Bore Diameter

	For Cylinder Type For Cylinder Type

Hydraulic

Air-Powered

	Cylinder Seal Type Cylinder Seal Type

314 Products

About O-Rings

Oil-Resistant Buna-N Backup Rings

Made of Buna-N, these backup rings resist grease, petroleum fluids, and motor oil.

Ultra-Chemical-Resistant PTFE Backup Rings

These PTFE backup rings resist harsh chemicals, such as acetone, fluorinated solvents, methanol, and many acids.

Backup Ring Assortments

These 325-piece assortments mean you’ll always have a backup ring on hand.

Rod Seals for O-Ring Grooves

Avoid common O-ring failure in dynamic applications—the square base of these seals prevents twisting, while backup rings protect against extrusion.

Head Seals

Replace the standard O-ring/backup ring combination with a more reliable alternative—these head seals resist twisting and remain stable even in applications with fluctuating pressure.

Piston Seals for O-Ring Grooves

Avoid common O-ring failure in dynamic applications—the square base of these seals prevents twisting, while backup rings protect against extrusion.

High-Pressure Piston Seals

Rated for pressure up to 10,000 psi, these seals withstand the highest pressure of our piston seals.

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