Double Seals | McMaster-Carr

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	For Rod Diameter For Rod Diameter

	For Use With For Use With

	Hardness Hardness

	Hardness Rating Hardness Rating

Medium

Hard

	For Cylinder Type For Cylinder Type

Hydraulic

Air-Powered

	Fractional Width Fractional Width

	For Bore Diameter For Bore Diameter

	Color Color

	Black
	White

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	For Sealing For Sealing

Pistons

Rods

	For Groove Diameter For Groove Diameter

	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

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626 Products

About O-Rings

X-Profile Oil-Resistant Buna-N O-Rings

Also known as Quattro Seals and X-rings, these X-profile O-rings have four points of contact for a better seal in dynamic applications than round-profile O-rings. They also require less compression to make a seal, so they offer a longer service life.

X-Profile Chemical-Resistant
Viton® Fluoroelastomer O-Rings

X-Profile Oil-Resistant Buna-N O-Ring Assortments

X-Profile Oil-Resistant Buna-N O-Ring Cord Stock

The X shape of this cord stock provides four points of contact for a better seal in dynamic applications than round profile. It also requires less compression to make a seal, so it offers a longer service life.

X-Profile Chemical-Resistant Viton®
Fluoroelastomer O-Ring Cord Stock

Dual-Purpose Rod and Piston Seals

O-Ring-Loaded U-Cup Seals

Also known as loaded-lip seals and PolyPaks, an O-ring secures these U-cups to the rod or piston for better sealing performance at lower pressures than unsupported U-cup seals.

High-Stability O-Ring-Loaded U-Cup Seals

Also known as Type B seals, these U-cups are wider than our other O-ring-loaded U-cup seals for better stability and fit in wider grooves.

High-Pressure Leather U-Cup Seals

Rated for pressure up to 10,000 psi, these leather U-cups handle over 80 times more pressure than our Buna-N U-cups.

Buna-N U-Cup Seals

These U-cup seals create less friction than O-ring-loaded U-cups, so they wear more slowly. Also known as lip seals, U-cups have a sealing lip on both the inside and outside edges, so they can be used for rod and piston sealing.

Spring-Loaded Seals

In addition to providing excellent sealing performance at low pressure, these seals withstand a wider range of temperatures and chemicals than U-cup seals. They’re also known as spring-energized seals.