Pneumatic Rod Seals

Pneumatic rod seals are low-friction dynamic seals fitted in an air cylinder end cap around the moving rod. They limit compressed-air leakage while allowing smooth extension and return, with rounded lip geometry suited to rapid cycling, light lubrication and controlled breakaway behaviour.

Key facts

Family: Pneumatic Seals
Common types: Rounded-lip U-cup, Asymmetric rod seal, PTFE energised seal, Compact pneumatic profile
Materials: Polyurethane, NBR, PTFE compound, FKM (fluoroelastomer)
Used in: Packaging machinery, Pneumatic clamps, Textile equipment, Assembly automation, Material handling

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Types

Rounded-lip U-cup
Asymmetric rod seal
PTFE energised seal
Compact pneumatic profile

Materials

Applications

Packaging machinery
Pneumatic clamps
Textile equipment
Assembly automation
Material handling

What to send for a quote

rod diameter
housing diameter and width
air lubrication condition
cylinder standard
temperature range

Questions about pneumatic rod seals

What should I send to identify pneumatic rod seals?

Send rod diameter, housing diameter and width, air lubrication condition, cylinder standard, temperature range. Note the pressure-facing lip direction and whether the seal shares a compact gland with a separate wiper. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select pneumatic rod seals?

Balance sealing force against low friction, then check dry or lubricated air, rod finish, cycling pattern and compound compatibility. Confirm the mating parts and operating environment before ordering, since an apparently similar size can use a different profile, material or internal arrangement.

Last updated: 2026-10-08