O-Rings

O-rings are seamless elastomeric rings with a round cross-section that compress inside a designed groove. They form simple bidirectional barriers for liquids or gases in static joints and selected dynamic duties, with compound choice determining compatibility with the fluid, temperature, motion and surrounding environment.

Key facts

Family: O-Rings & Static Seals
Common types: ISO 3601 metric, AS568 inch, JIS sizes, BS sizes, Custom moulded sizes
Materials: NBR, FKM (fluoroelastomer), EPDM, Silicone, HNBR, PTFE-encapsulated elastomer
Used in: Hydraulic manifolds, Valves, Pipe couplings, Gearboxes, Pumps, Automotive assemblies

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Types

ISO 3601 metric
AS568 inch
JIS sizes
BS sizes
Custom moulded sizes

Materials

Applications

Hydraulic manifolds
Valves
Pipe couplings
Gearboxes
Pumps
Automotive assemblies

What to send for a quote

inside diameter
cross-section
material
hardness
size standard

Questions about o-rings

What should I send to identify o-rings?

Send inside diameter, cross-section, material, hardness, size standard. Measure an unstretched ring and the groove, because used elastomer may swell, shrink or develop a flattened section. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select o-rings?

Select the compound from fluid, temperature, pressure, motion, exposure and required compression behaviour. 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