Double-Seal O-Rings | McMaster-Carr

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	Seal Width Seal Width

	For Motion Type For Motion Type


Reciprocating	Rotary

Oscillating

	For Rod Diameter For Rod Diameter

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	Hardness Hardness

	Hardness Rating Hardness Rating

	Color Color

	Black		Blue
	White		Gray
	Brown		Beige
	Gold

	For Bore Diameter For Bore Diameter

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

DFARS Specialty Metals
COTS-Exempt

	Fractional Width Fractional Width

	For Sealing For Sealing

Rods

Shafts

Pistons

	For Cylinder Type For Cylinder Type

Hydraulic

Air-Powered

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1,545 Products

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.

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.

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.

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.

Rod Seals

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.

Rod Seals

These seals have a beveled lip that optimizes contact against the rod, while a secondary lip keeps the seal stable.

High-Speed Rod Seals

The slippery PTFE surface of these seals allows rod motion up to seven times faster than our other rod seals.

High-Pressure Hydraulic Cylinder Buffering Seals

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

High-Speed Hydraulic Cylinder Buffering Seals

PTFE gives these seals a slippery surface that facilitates rod speeds over seven times faster than our other buffering seals. They're rated for pressure up to 5,000 psi.

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.

Air-Powered Cylinder Cushioning Seals

For use in air-powered cylinders, these seals prevent the piston from slamming against the cylinder body to minimize wear and noise.

Piston Seals

High-Speed Piston Seals

PTFE gives these seals a slippery surface that allows rod speeds more than two times faster than our other piston seals.

High-Stability High-Speed Piston Seals

A square O-ring prevents these piston seals from rocking in the groove.

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.

Piston Cup Seals

These Buna-N seals are reinforced with cotton thread for strength.

High-Pressure Piston Seals

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

Rod Wipers

These rod wipers are also known as U-type wipers.

Rod-Sealing Wipers

A two-lip design means that these wipers also function as a rod seal.

Cylinder-Sealing Rod Wipers

These wipers seal against the cylinder housing to prevent contaminants from entering between the outside edge and the housing.

High-Speed Rod Wipers

Made from MDS-filled PTFE for a slippery surface, these wipers allow rods to move three times faster than other rod wipers.

Rod Wipers for Open Grooves

Replace wipers in open-groove cylinders—these wipers have an integral steel case so they press fit into the groove around the rod.

Wear Rings

Made from glass-filled nylon for excellent wear resistance and strength.

High-Speed Wear Rings

Made from PTFE, these wear rings have a slippery surface that allows rods to move at least three times faster than nylon wear rings.

Wear Ring Stock

Cut this stock to make wear rings that fit any rod or bore diameter.

Rotary Shaft Seals

Mechanical Pump Shaft Seals with Extended Spring

An extended spring on these seals accommodates variations in seal cavity length and pump misalignment.

Narrow-Profile Mechanical Pump
Shaft Seals with Extended Spring

These seals fit in housing bores that meet DIN 24960.

Mechanical Pump Shaft Seals

These seals are commonly used in well, sump, and displacement pumps.

High-Speed Mechanical Pump Shaft Seals

Built for high-speed circulation and dispensing pumps, these seals have a short spring that facilitates speeds up to 10,000 rpm.

Heavy Duty Mechanical Pump Shaft Seals

Multiple internal springs ensure these seals keep the sealing surfaces in contact in demanding applications, such as agricultural, chemical, and mining pumps.

Shaft-Mounted Rotary Seals

Made from Buna-N for excellent resistance to oil and grease.

Heavy Duty Shaft-Mounted Rotary Seals

These seals are fluoroelastomer, so they have excellent chemical resistance and withstand temperatures up to 390° F.

Bore-Sealing Spring-Loaded
Rotary Shaft Seals with Wiper Lip

Ribbed Buna-N over steel creates a tight seal with the bore, even when mating with a rough surface or in a split housing.

Spring-Loaded Rotary Shaft Seals with Wiper Lip

These seals have a metal case that creates a tight seal when mating with smooth surfaces.

Spring-Loaded Rotary Shaft Seals

Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. A spring secures the lip against the shaft, preventing messy leaks. Press-fit seals into the bore around the shaft.

Spring-Loaded Rotary Shaft Seals for Misaligned Shafts

Designed with an extended lip, these seals have the flexibility to accommodate shaft misalignment up to 0.125". They're also known as clipper seals.

Rotary Shaft Seals for Grease

Also known as grease seals, these are designed to retain thick lubricant at low pressure. They have a light grip on the shaft that creates less friction than spring-loaded seals.

High-Speed Rotary Shaft Seals

A slippery PTFE surface allows these seals to function at speeds at least 25% faster than other rotary shaft seals.

Split Rotary Shaft Seals

Swap out old seals without disassembling components—these seals come split for easy installation. They're also known as clipper seals.

Mechanical Shaft Seals

Commonly used in mixing and grinding equipment, conveyors, and construction machinery, these two-part seals withstand exposure to abrasive material.

Stackable V-Ring Packing Seals

PTFE Stackable V-Ring Packing Seals

PTFE has excellent chemical resistance and withstands a wide temperature range of -110° F to 500° F.

High-Pressure Leather Stackable V-Ring Packing Seals

These leather V-ring packing seals handle over twice the pressure as PTFE. Leather is tough, pliable, and wear resistant, so it flexes to fit uneven surfaces and fill voids.

O-Rings

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

X-Profile Chemical-ResistantViton® Fluoroelastomer O-Rings

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

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

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

Dual-Purpose Rod and Piston Seals

O-Ring-Loaded U-Cup Seals

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

Buna-N U-Cup Seals

High-Pressure Leather U-Cup Seals

Spring-Loaded Seals

Rod Seals

Rod Seals for O-Ring Grooves

Rod Seals

High-Speed Rod Seals

High-Pressure Hydraulic Cylinder Buffering Seals

High-Speed Hydraulic Cylinder Buffering Seals

Head Seals

Air-Powered Cylinder Cushioning Seals

Piston Seals

High-Speed Piston Seals

High-Stability High-Speed Piston Seals

Piston Seals for O-Ring Grooves

Piston Cup Seals

High-Pressure Piston Seals

Rod Wipers

Rod Wipers

Rod-Sealing Wipers

Cylinder-Sealing Rod Wipers

High-Speed Rod Wipers

Rod Wipers for Open Grooves

Wear Rings

Wear Rings

High-Speed Wear Rings

Wear Ring Stock

Rotary Shaft Seals

Mechanical Pump Shaft Seals with Extended Spring

Narrow-Profile Mechanical PumpShaft Seals with Extended Spring

Mechanical Pump Shaft Seals

High-Speed Mechanical Pump Shaft Seals

Heavy Duty Mechanical Pump Shaft Seals

Shaft-Mounted Rotary Seals

Heavy Duty Shaft-Mounted Rotary Seals

Bore-Sealing Spring-LoadedRotary Shaft Seals with Wiper Lip

Spring-Loaded Rotary Shaft Seals with Wiper Lip

Spring-Loaded Rotary Shaft Seals

Spring-Loaded Rotary Shaft Seals for Misaligned Shafts

Rotary Shaft Seals for Grease

High-Speed Rotary Shaft Seals

Split Rotary Shaft Seals

Mechanical Shaft Seals

Stackable V-Ring Packing Seals

PTFE Stackable V-Ring Packing Seals

High-Pressure Leather Stackable V-Ring Packing Seals

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

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

Narrow-Profile Mechanical Pump
Shaft Seals with Extended Spring

Bore-Sealing Spring-Loaded
Rotary Shaft Seals with Wiper Lip