1 Scope
This part of ISO 3601 specifies dimensions and tolerances for five types of anti-extrusion rings, which are also known as back-up rings:
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a) spiral type (T1);
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b) angle cut type (T2);
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c) solid type (T3);
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d) angle cut concave type (T4);
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e) 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.