For a complete listing of all metric o-ring sizes, visit our Metric O-Ring Cross Reference Table.Look up isometric in Wiktionary, the free dictionary. 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. Class B allows production of O-Rings in technically acceptable and economical “metric” sizes, which can then fit into metric grooves. The ISO 3601-1 Size Code for these O-Rings is the same as the AS 568 dash number. Class A corresponds to the American standard AS 568B in its current format (the 900 series tube fitting O-Rings are not included). Issued by the International Organization for Standardization, the ISO 3601 standard contains two groups of O-Rings, Class A and Class B. Grade CS: Special and critical sealing applications, such as certain aerospace applications and critical oxygen service applications.Įxamples of surface imperfections characterized by this standard include flash, offset, parting-line projection, back rind, excessive trimming, flow marks, non-fills, and indentations. Grade S: Quality requirements for optimum performance industrial applications and aerospace applications. Grade N: The standard of acceptance for general-purpose O-rings. ISO 3601-3 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. Class B O-rings have slightly wider tolerances and are suitable for general-purpose applications. Class A O-rings have equivalent tolerances to those used in AS568, 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. ISO 3601-1 states two classes of O-rings: Class A and Class B. Stricter tolerance and inspection requirements can be achieved upon customer request. This information can be viewed in PDF format here. Subsequently, Global O-Ring and Seal defines the quality acceptance criteria of all O-rings to be in accordance with ISO 3601-3 Grade N which classifies surface imperfections and specifies maximum acceptable limits for these imperfections.
Global O-Ring and Seal is fully compliant to the dimension and tolerance standards spelled out in ISO 3601-1 Class A for all standard series O-rings and Class B for all metric series O-rings.
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