Hydraulic Rod Seals

Hydraulic rod seals are dynamic gland seals that retain pressurised fluid where a reciprocating rod leaves a cylinder. Their working lip follows the rod surface, limits external leakage and preserves a controlled lubricating film, while the static side seals securely against the housing groove.

Key facts

Family: Hydraulic Seals
Common types: Single-lip U-cup, Double-lip U-cup, Asymmetric lip seal, Energised slide ring, Compact multi-lip seal
Materials: Polyurethane, NBR, PTFE compound, FKM (fluoroelastomer)
Used in: Earthmoving cylinders, Hydraulic presses, Agricultural machinery, Forklift cylinders, Machine tools

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Types

Single-lip U-cup
Double-lip U-cup
Asymmetric lip seal
Energised slide ring
Compact multi-lip seal

Materials

Applications

Earthmoving cylinders
Hydraulic presses
Agricultural machinery
Forklift cylinders
Machine tools

What to send for a quote

rod diameter
groove diameter and width
fluid type
working pressure
temperature range

Questions about hydraulic rod seals

What should I send to identify hydraulic rod seals?

Send rod diameter, groove diameter and width, fluid type, working pressure, temperature range. Specify whether the cylinder is single-acting or double-acting and note any buffer seal fitted ahead of the rod seal. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select hydraulic rod seals?

Choose the lip form and compound from pressure behaviour, rod speed, fluid, temperature, extrusion gap and surface condition. 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