Hydraulic Cylinder Static Seals

Hydraulic cylinder static seals are shaped rings used between stationary barrel, gland, cap or manifold interfaces. Their section controls compression and extrusion at joints that experience pressure and thermal movement without regular sliding, providing a purpose-designed alternative to a basic round O-ring in demanding grooves.

Key facts

Family: Hydraulic Seals
Common types: Square profile, D-profile, Polyurethane static ring, O-ring with contoured back-up, Symmetrical static seal
Materials: Polyurethane, NBR, FKM (fluoroelastomer), POM, PTFE
Used in: Cylinder head joints, End cap joints, Hydraulic manifolds, Accumulators, Press cylinders

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Types

Square profile
D-profile
Polyurethane static ring
O-ring with contoured back-up
Symmetrical static seal

Materials

Applications

Cylinder head joints
End cap joints
Hydraulic manifolds
Accumulators
Press cylinders

What to send for a quote

tube or spigot diameter
groove diameter and width
fluid type
pressure direction
temperature range

Questions about hydraulic cylinder static seals

What should I send to identify hydraulic cylinder static seals?

Send tube or spigot diameter, groove diameter and width, fluid type, pressure direction, temperature range. A groove sketch is important because square, D-shaped and energised sections may share similar outside dimensions but compress differently. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select hydraulic cylinder static seals?

Match the profile to groove geometry, extrusion clearance, pressure direction, assembly movement and hydraulic fluid 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