as568a o ring

  ISO 3601-1 is authored by the International Organization for Standardization. This document contains two groups of O-Rings. The first group, designated for General Industrial applications are "inch" sizes that for the most part match up exactly to the AS 568 O-Ring sizes (the AS 568 tube fitting O-Rings are not included). The ISO 3601-1 Size Code for these O-Rings is the same as the AS 568 dash number. The second group of O-Rings are "metric" sizes and are designated for Aerospace applications. The first digit of the Size Code indicates the cross section group (A-E), while the last four digits indicate the O-Ring inside diameter rounded to one-tenth millimeter. Complete item designations for both types include the word O-Ring followed by a hyphen and ISO 3601-1, followed by another hyphen and the Size Code and a letter indicating the tolerance class, another hyphen and a description of the size, and a final hyphen and a letter code indicating the Grade. Additionally, O-Rings intended for Aerospace use will be indicated by the letter A following 3601-1 (3601-1A) in the item designation. The tolerance classes are designated by the letters A and B (A is tighter). Aerospace O-Rings have only one tolerance class. Grade codes, N, S, and CS indi-cate General Purpose, Special, and Critical Service respectively. The grades are primarily visual inspection standards and are defined in ISO 3601-3.

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