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International O-ring Sizes
An O-ring, or toroidal seal, is the most common type of seal used in the world today.
Used to form a physical barrier to prevent the mixing of gases or liquid fluids, the simple toroidal shape of an O-ring has proven to offer high sealing efficiency across a wide range of applications.
PPE manufactures elastomer O-rings from a broad range of material grades to the following international standard O-ring sizes:-
- AS568 SAE (Society of Automotive Engineers) Standard O-ring sizes
- ISO3601 International Organisation for Standardisation (metric O-rings)
- British Standard BS1806 O-ring sizes (imperial)
- British Standard extended series 500-800 O-ring sizes (imperial)
- British Standard BS4518 O-ring sizes (metric O-rings) - replaced by ISO3601 standard
- British Dowty O-ring sizes
- German Standard DIN3771 metric O-ring sizes - replaced by ISO3601 standard
- Le Joint Français 'R' metric O-ring sizes
- Japanese Standard JIS B 2401 (P, G and V) O-ring sizes
Get a quote for standard or custom sized O-rings
Need help sizing your hardware for standard sized O-rings? Visit our O-ring groove dimension look-up tool.
Document Downloads
| Standard | Download | ||
|---|---|---|---|
| ISO3601 | Standard sizes and tolerances for ISO3601 O-rings | ||
| BS1806 | British Standard BS1806 O-ring sizes (imperial) | ||
| BS4518 | British Standard BS4518 O-ring sizes (metric O-rings) - replaced by ISO3601 standard | ||
| BS 500-800 | British Standard extended series 500-800 O-ring sizes (imperial) | ||
| Dowty | British Dowty O-ring sizes | ||
| AS568 | AS568 SAE (Society of Automotive Engineers) Standard O-ring sizes | ||
| DIN3771 | German Standard DIN3771 metric O-ring sizes - replaced by ISO3601 standard | ||
| LJF 'R' | Le Joint Français 'R' metric O-ring sizes | ||
| JIS B 2401 | Japanese Standard JIS B 2401 (P, G and V) O-ring sizes |