Hydraulic Piston Seals

Hydraulic piston seals are dynamic seals fitted around a cylinder piston to separate the two pressure chambers. They restrict fluid bypass so pressure can move or hold the piston, and may use one-piece lips or multi-part low-friction assemblies for single-acting or double-acting motion.

Key facts

Family: Hydraulic Seals
Common types: Single-acting U-cup, Double-acting slide ring, Compact multi-part seal, Capped T-profile, Fabric-reinforced set
Materials: Polyurethane, PTFE compound, NBR, Fabric-reinforced NBR, POM
Used in: Mobile hydraulics, Injection moulding machines, Marine rams, Tipper cylinders, Industrial presses

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Types

Single-acting U-cup
Double-acting slide ring
Compact multi-part seal
Capped T-profile
Fabric-reinforced set

Materials

Applications

Mobile hydraulics
Injection moulding machines
Marine rams
Tipper cylinders
Industrial presses

What to send for a quote

cylinder bore
piston groove diameter
groove width
acting direction
fluid and pressure

Questions about hydraulic piston seals

What should I send to identify hydraulic piston seals?

Send cylinder bore, piston groove diameter, groove width, acting direction, fluid and pressure. State whether guide rings and anti-extrusion elements are separate or integrated into the existing piston assembly. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select hydraulic piston seals?

Match the seal to single or double action, pressure reversal, bore finish, speed, side loading and available groove geometry. 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