For standard sizes aerospace standard as568 and iso 3601 for metric sizes are used to give the dimension and tolerance. O rings are typically called out by the inner diameter of the torus and the diameter of the round cross section. The global o ring and seal size reference chart covers the as568 o ring sizes published by the society of automotive engineers s a e and includes the extended sizes in the 400 series dimensional tolerances for all as568 o rings offered by global o ring and seal are in accordance with iso 3601 1a the purpose of this chart is to specify the inside diameters cross.
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