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ISO 3601-4:2008 Fluid power systems - O-rings - Part 4: Anti-extrusion rings (back-up rings)
standard by International Organization for Standardization, 06/01/2008
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ISO 3601-4:2008 specifies dimensions and tolerances for five types of anti-extrusion rings, which are also known as back-up rings:
spiral type (T1);angle cut type (T2);solid type (T3);angle cut concave type (T4);solid concave type (T5).These anti-extrusion rings are for use with selected O-ring sizes as specified in ISO 3601-1 and the relevant housing dimensions specified in ISO 3601-2.