Global O-Ring and Seal is fully compliant to the dimension and tolerance standards spelled out in ISO 3601-1 Class A<\/strong> for all standard series O-rings and Class B<\/strong> for all metric series O-rings<\/a>. 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<\/strong> which classifies surface imperfections and specifies maximum acceptable limits for these imperfections. This information can be viewed in PDF format here<\/strong><\/a>. Stricter tolerance and inspection requirements can be achieved upon customer request.<\/p>\n ISO 3601-1 states two classes of O-rings: Class A<\/strong> and Class B<\/strong>. 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. Class B O-rings have slightly wider tolerances and are suitable for general-purpose applications.<\/p>\n 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)<\/strong> of defects depending upon the application.<\/p>\n Grade N<\/strong>: The standard of acceptance for general-purpose O-rings.<\/p>\n Grade S<\/strong>: \u00a0Quality requirements for optimum performance industrial applications and aerospace applications.<\/p>\n Grade CS<\/strong>: Special and critical sealing applications, such as certain aerospace applications and critical oxygen service applications.<\/p>\n Examples of surface imperfections characterized by this standard include flash, offset, parting-line projection, back rind, excessive trimming, flow marks, non-fills, and indentations.<\/p>\n Issued by the International Organization for Standardization, the ISO 3601 standard contains two groups of O-Rings, Class A and Class B. Class A corresponds to the American standard AS 568B in its current format (the 900 series 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. Class B allows production of O-Rings in technically acceptable and economical \u201cmetric\u201d sizes, which can then fit into metric grooves. 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.<\/p>\nISO 3601-1: Dimensional Tolerances<\/h2>\n
ISO 3601-3: Quality Acceptance Criteria<\/h2>\n
ISO 3601 Metric O-Rings Size Chart<\/h2>\n
For a complete listing of all metric o-ring sizes, visit our Metric O-Ring Cross Reference Table<\/a>.<\/h3>\n \n \n \u30e1\u30c8\u30ea\u30c3\u30afO\u30ea\u30f3\u30b0\u306e\u8ca9\u58f2\u5e97 <\/span>\n\n