O-Ring Standard
Metric O-Rings
Metric O-rings are specified by inside diameter and cross-section in millimetres and are the default on European and Asian-designed machinery, hydraulic components and OEM equipment supplied outside North America.
Sample sizes
Representative sizes
| Dash / Size | ID (mm) | CS (mm) |
|---|---|---|
| 14×2 | 14.0 | 2.0 |
| 25×3 | 25.0 | 3.0 |
| 40×3 | 40.0 | 3.0 |
| 60×5 | 60.0 | 5.0 |
| 100×5 | 100.0 | 5.0 |
Available in
Compounds
Material
NBR (Nitrile / Buna-N)
NBR is the workhorse elastomer of the sealing industry — a copolymer of butadiene and acrylonitrile whose acry…
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FKM / FPM (Fluoroelastomer)
FKM (often referenced by the trade name Viton) is a fluorine-containing elastomer built for aggressive chemica…
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EPDM
EPDM's saturated backbone gives outstanding resistance to ozone ageing, UV and weathering along with strong pe…
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Silicone (VMQ)
Silicone offers the widest usable temperature range of any common elastomer and is available in FDA- and USP C…
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HNBR (Hydrogenated Nitrile)
Hydrogenating the NBR backbone removes most of the residual unsaturation, substantially improving heat, ozone …
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FFKM (Perfluoroelastomer)
FFKM replaces essentially all hydrogen with fluorine, approaching PTFE-level chemical inertness while retainin…
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