Oil O-Rings | McMaster-Carr

Head seals are a more reliable alternative to the standard O-ring/backup ring combination—they resist twisting and remain stable even in applications with fluctuating pressure.

Buffering seals protect hydraulic cylinders from pressure spikes and shock in high-pressure hydraulic applications.

Cushioning seals minimize wear and noise in air-powered cylinders by preventing the piston from slamming against the cylinder body.

Piston seals make a seal between their outside edge and the cylinder bore to prevent internal leaks.

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

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.

Reciprocating 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.

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 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.

Wear Rings

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

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.

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.

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 Cylinder Seals

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

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