Reciprocating Seals | McMaster-Carr

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About Cylinder Seals

Rod wipers scrape dirt, dust, and moisture from the rod, preventing contamination inside your cylinder.

Rod seals maintain the pressure inside cylinders and prevent fluid from leaking out.

Wear rings guide the rod and piston to prevent uneven wear and optimize seal performance.

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.

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

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

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.

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.

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.

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

Rod-Sealing Wipers

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

Rod Wipers

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

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.

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.

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.