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If you have an o-ring that has failed and you require a replacement, while shopping you may be surprised to find out just how expansive the o-ring market is. If you are new to shopping for fluid sealing products you may feel you are reading a different language with different combinations of letters and numbers. Luckily, it is not as complicated as it may seem!
The good news is that there is a Global O-Ring and Seal Size Reference Chart and Guide that was published by the Society of Automotive Engineers that covers the AS568 o-ring sizes, including the extended sizes in the 400 series. This chart helps with sizing because it specifies diameter, cross-section, tolerances, and size identification codes for o-rings.
This o-ring size chart was published in 1971 by the A-6c2 Seals Committee at SAE as Aerospace Standard AS568. In 1974, these standards were republished as AS568A and then again in 2001 as AS568B, in 2008 as AS568C, and in 2014 as AS568D. Today any of these terms can be used interchangeably when referring to o-ring dash size.
Much like the Global O-Ring and Seal Size Reference Chart, the BS 1806 sizing guide was issued by the British Standards Institution and lists all Imperial standard sizes. This standard also includes all of the 5 main cross-section groups in the AS568 and sizes that are between AS568 sizes. The BS 1806 standard size guide has been replaced by the BS ISO 3601, although BS1806 standard is still heavily referenced and relevant.
