AS568A vs. AS568B vs. AS568C

What is the difference between the AS568A, AS568B and AS568C designation for O-rings?

An AS568A number is a three-digit suffix that identifies the O-ring's size. The SAE (Society of Automotive Engineers) published the original document that established these o-ring sizes. The AS in AS568A stands for Aerospace Standard. These o-ring sizes are standard throughout the o-ring industry and also in most military applications. AS568 is generally considered to be the U.S. size standard and there is no difference between the AS568A, AS568B or AS568C designation.

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