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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 Download File
BS1806 Download File
BS4518 Download File
BS 500-800 Download File
Dowty Download File
AS568 Download File
DIN3771 Download File
LJF 'R' Download File
JIS B 2401 Download File
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