Flow Marks radial orientation of flow marks is not permissible. ISO If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. For dated references, the edition cited applies. A list of organizations represented on this committee can be obtained ixo request to its secretary. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
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Subsequently, Global O-Ring and Seal defines the quality acceptance criteria of all O-rings to be in accordance with ISO Grade N which classifies surface imperfections and specifies maximum acceptable limits for these imperfections. This information can be viewed in PDF format here. Stricter tolerance and inspection requirements can be achieved upon customer request.
Class A O-rings have equivalent tolerances to those used in AS, which are tighter than the tolerances for Class B O-rings, and are suitable for industrial or aerospace applications when the application or the housing require tighter tolerances. Class B O-rings have slightly wider tolerances and are suitable for general-purpose applications.
ISO Quality Acceptance Criteria ISO was originally developed for general-purpose O-rings, but over the years this standard has been revised and refined to include three grades N, S, CS of defects depending upon the application.
Grade N: The standard of acceptance for general-purpose O-rings. Grade CS: Special and critical sealing applications, such as certain aerospace applications and critical oxygen service applications. Examples of surface imperfections characterized by this standard include flash, offset, parting-line projection, back rind, excessive trimming, flow marks, non-fills, and indentations.
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.
ISO 3601 Metric O-Rings