Grease O-Rings | McMaster-Carr

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	Material Material

Rubber

Plastic

Leather

	Hardness Rating Hardness Rating

	Color Color

	Black		White
	Brown		Clear
	Blue		Cream
	Gray		Beige

	For Use With For Use With	Show

Grease

	For Use With For Use With	Hide

Warning: Products have one, but not necessarily all, of the selected characteristics.

	Fractional ID Fractional ID

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	Fractional OD Fractional OD

	Specifications Met Specifications Met

SAE

ASTM

FDA Compliant

Mil. Spec.

USP

ISO

DIN

3-A Sanitary Certified

ANSI

	Environment Environment

Food and Beverage

Sanitary

Clean Room

	For Tube OD For Tube OD

	For Shaft Diameter For Shaft Diameter

0.210" to 0.260"

0.217" to 0.256"

1/4"

5/16"

0.370" to 0.450"

0.374" to 0.453"

3/8"

0.450" to 0.530"

1/2"

0.610" to 0.689"

0.610" to 0.690"

0.690" to 0.770"

0.950" to 1.070"

1.220" to 1.299"

1.220" to 1.300"

1.496" to 1.693"

1.500" to 1.700"

1.700" to 1.890"

1.890" to 2.090"

2.090" to 2.290"

2.480" to 2.680"

2.677" to 2.874"

2.680" to 2.880"

2 3/4"

2.874" to 3.071"

2 7/8"

2.880" to 3.070"

3.070" to 3.270"

3.071" to 3.268"

3 1/4"

3.470" to 3.660"

3 1/2"

3.860" to 4.140"

11.500 to 12.500mm

13.500 to 15.500mm

15.500 to 17.500mm

19.000 to 21.000mm

24.000 to 27.000mm

29.000 to 31.000mm

33.000 to 36.000mm

38.000 to 43.000mm

48.000 to 53.000mm

	Seal OD Seal OD

	For Motion Type For Motion Type


Reciprocating	Rotary

Oscillating

	Seal ID Seal ID

	Thickness Thickness

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7,588 Products

About O-Rings

Oil-Resistant Buna-N O-Rings

Made of Buna-N, these O-rings resist grease, hydraulic oil, and motor oil—plus mild chemicals and water.

Oil-Resistant Soft Buna-N O-Rings

Softer than standard Buna-N O-rings for a better seal in low-pressure applications.

Oil-Resistant Hard Buna-N O-Rings

These hard O-rings offer better wear resistance than standard Buna-N O-rings.

Oil-Resistant Hard Buna-N
O-Rings for Tube Fittings
with Straight-Thread Connection

Also known as Boss O-rings, these hard O-rings are for use in tube fittings with a straight-thread connection.

Made-to-Order Oil-Resistant
Buna-N O-Rings

When you need an O-ring that’s not an industry standard size, we can make one to fit your requirements. These resist grease, hydraulic oils, and motor oil.

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

With flat edges on all four sides, square-profile O-rings cover more surface than round-profile O-rings for a better seal in static applications, such as hose, pipe, and faucet connections.

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.

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

These O-rings have eight points of contact for a better seal in dynamic applications than X-profile O-rings, plus they have eight grooves that hold lubricant to reduce friction and wear for a longer service life.

Oil-Resistant Food
Industry Buna-N O-Rings

These Buna-N O-rings are made of FDA-listed material for use with food and beverage.

Oil-Resistant Metal-Detectable
Buna-N O-Rings

If these O-rings deteriorate, they can be picked up by metal detection systems.

Oil-Resistant Clean
Room Buna-N O-Rings

These Buna-N O-rings are made and bagged in an ISO Class 7 (10,000) clean room.

Ultra-Strength
Oil- and
Abrasion-Resistant
Polyurethane O-Rings

These O-rings are harder and stronger than standard polyurethane O-rings to handle high-pressure applications.

Chemical-Resistant O-Rings

Chemical-Resistant Viton®
Fluoroelastomer O-Rings

These Viton® fluoroelastomer O-rings resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol.

Chemical-Resistant Soft Viton®
Fluoroelastomer O-Rings

Softer than standard Viton® fluoroelastomer O-rings, these offer a better seal in low-pressure applications.

Chemical-Resistant Hard
Viton® Fluoroelastomer
O-Rings for Tube Fittings
with Straight-Thread Connection

Also known as Boss O-rings, these hard O-rings are for use in tube fittings with a straight-thread connection.

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

With flat edges on all four sides, these square-profile O-rings cover more surface than round-profile O-rings for a better seal in static applications, such as hose, pipe, and faucet connections.

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

Chemical-Resistant Super-Resilient
Viton® Fluoroelastomer O-Rings

These durable O-rings bounce back to shape after repeated compression better than other types of Viton® fluoroelastomer O-rings.

Chemical-Resistant Brown
Viton® Fluoroelastomer O-Rings

Because one black O-ring looks just like another, these O-rings are brown for easy identification.

Chemical-Resistant Mil. Spec.
Viton® Fluoroelastomer O-Rings

All of these O-rings meet MIL-R-83248C.

Chemical-Resistant High-Purity
Clean Room Viton®
Fluoroelastomer O-Rings

These are the highest purity chemical-resistant O-rings we offer. They are made and bagged in an ISO Class 7 (Class 10,000) clean room, plus they’re USP VI certified; not for use in medical applications.

Chemical-Resistant Clean Room
Viton® Fluoroelastomer O-Rings

Made and bagged in an ISO Class 7 (10,000) clean room.

Chemical-Resistant Mil. Spec. Viton®
Fluoroelastomer O-Rings
for Tube Fittings with
Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection. They meet MIL-R-83248C.

Chemical- and Steam-Resistant
Viton® Fluoroelastomer O-Rings

In addition to resisting chemicals, such as benzene, butyl alcohol, and ethylene glycol, these Viton® fluoroelastomer ETP O-rings resist steam.

Ultra-Chemical-Resistant
Rigid PTFE O-Rings

Rigid and hard with a slippery surface, these PTFE O-rings resist harsh chemicals, such as acetone, fluorinated solvents, methanol, and boric acid.

Ultra-Chemical-Resistant Rigid
PTFE O-Rings for Tube Fittings
with Straight-Thread Connection

These temperature- and chemical-resistant O-rings prevent leaks in tube fittings that have a straight-thread connection, also known as O-ring boss fittings.

Ultra-Chemical-Resistant
FEP-Encapsulated Silicone O-Rings

The FEP casing on these O-rings provides the same level of resistance to harsh chemicals as PTFE O-rings, but the core material is soft to make these O-rings more compressible.

Ultra-Chemical-Resistant
FEP-Encapsulated
Viton® Fluoroelastomer O-Rings

Unlike silicone, the Viton® fluoroelastomer core will continue to ward of chemicals should the FEP casing wear away.

Ultra-Chemical-Resistant
Kalrez 4079 O-Rings

Inherently softer and more compressible than PTFE O-rings, these Kalrez 4079 O-rings have comparable chemical resistance.

Ultra-Chemical-Resistant
Super-Resilient Kalrez 7075 O-Rings

Able to bounce back after repeated compression, these Kalrez 7075 O-rings last longer than other Kalrez O-rings when exposed to repeated heating/cooling cycles.

Ultra-Chemical-Resistant
High-Purity Kalrez 6230 O-Rings

Made of Kalrez 6230, these O-rings are for use when high purity is essential, such as with food and semiconductors.

Ultra-Chemical- and Steam-Resistant
Kalrez 6375 O-Rings

Kalrez 6375 O-rings are preferred over Kalrez 4079 for chemical-processing environments and applications involving steam.

Ultra-Chemical-Resistant
Aflas O-Rings

While these Aflas O-rings are commonly used with petroleum fluids, they also resist many chemicals, such as ammonia, calcium hydroxide, and acetic, boric, and phosphoric acids.

Chemical-Resistant Low-Temperature
Fluorosilicone O-Rings
for Tube Fittings with
Straight-Thread Connection

Flexible even at temperatures as low as -80° F, these fluorosilicone O-rings will keep your fittings free from leaks. They’re often used on fuel and coolant hose because fluorosilicone resists many chemicals, including ethanol and ethylene glycol.

Chemical-Resistant Metal-Detectable
Fluoroelastomer O-Rings

If these O-rings deteriorate, they can be picked up by metal detection systems.

Made-to-Order Chemical-Resistant
Fluoroelastomer O-Rings

When you need an O-ring that’s not an industry standard size, we can make one to fit your requirements.

O-Ring Backup 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.

O-Ring Cord Stock

Oil-Resistant Buna-N
O-Ring Cord Stock

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

This square-profile cord stock has flat edges on all four sides, which creates a better seal than round profile in static applications, such as hose, pipe, and faucet connections.

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.

Water-Resistant Neoprene
O-Ring Cord Stock

Use neoprene cord stock to make O-rings for applications that come into contact with water.

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

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

Reciprocating Rod and Piston Seals

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.

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-Pressure Hydraulic
Cylinder Buffering Seals

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

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 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 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.

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.

Cylinder-Sealing Rod Wipers

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

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.

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.

Rotary Shaft Seals

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.

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.

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.

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.

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 ANSI and DIN 24960.

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.

Stackable V-Ring Packing Seals

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.

PTFE Stackable
V-Ring Packing Seals

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

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About O-Rings

Oil-Resistant O-Rings

Oil-Resistant Buna-N O-Rings

Oil-Resistant Soft Buna-N O-Rings

Oil-Resistant Hard Buna-N O-Rings

Oil-Resistant Hard Buna-NO-Rings for Tube Fittings with Straight-Thread Connection

Made-to-Order Oil-ResistantBuna-N O-Rings

Square-Profile Oil-ResistantBuna-N O-Rings

X-Profile Oil-ResistantBuna-N O-Rings

Double X-Profile Oil-ResistantBuna-N O-Rings

Oil-Resistant FoodIndustry Buna-N O-Rings

Oil-Resistant Metal-DetectableBuna-N O-Rings

Oil-Resistant CleanRoom Buna-N O-Rings

Ultra-StrengthOil- and Abrasion-Resistant Polyurethane O-Rings

Chemical-Resistant O-Rings

Chemical-Resistant Viton®Fluoroelastomer O-Rings

Chemical-Resistant Soft Viton®Fluoroelastomer O-Rings

Chemical-Resistant HardViton® Fluoroelastomer O-Rings for Tube Fittings with Straight-Thread Connection

Square-Profile Chemical-ResistantViton® Fluoroelastomer O-Rings

X-Profile Chemical-ResistantViton® Fluoroelastomer O-Rings

Chemical-Resistant Super-ResilientViton® Fluoroelastomer O-Rings

Chemical-Resistant BrownViton® Fluoroelastomer O-Rings

Chemical-Resistant Mil. Spec.Viton® Fluoroelastomer O-Rings

Chemical-Resistant High-PurityClean Room Viton® Fluoroelastomer O-Rings

Chemical-Resistant Clean RoomViton® Fluoroelastomer O-Rings

Chemical-Resistant Mil. Spec. Viton®Fluoroelastomer O-Rings for Tube Fittings with Straight-Thread Connection

Chemical- and Steam-ResistantViton® Fluoroelastomer O-Rings

Ultra-Chemical-ResistantRigid PTFE O-Rings

Ultra-Chemical-Resistant RigidPTFE O-Rings for Tube Fittings with Straight-Thread Connection

Ultra-Chemical-ResistantFEP-Encapsulated Silicone O-Rings

Ultra-Chemical-ResistantFEP-Encapsulated Viton® Fluoroelastomer O-Rings

Ultra-Chemical-ResistantKalrez 4079 O-Rings

Ultra-Chemical-ResistantSuper-Resilient Kalrez 7075 O-Rings

Ultra-Chemical-ResistantHigh-Purity Kalrez 6230 O-Rings

Ultra-Chemical- and Steam-ResistantKalrez 6375 O-Rings

Ultra-Chemical-ResistantAflas O-Rings

Chemical-Resistant Low-TemperatureFluorosilicone O-Rings for Tube Fittings with Straight-Thread Connection

Chemical-Resistant Metal-DetectableFluoroelastomer O-Rings

Made-to-Order Chemical-ResistantFluoroelastomer O-Rings