BS ISO 3601-4:2008

Fluid power systems. O-rings. Anti-extrusion rings (back-up rings) | Status: Under review, Current

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:

1. a) spiral type (T1);
2. b) angle cut type (T2);
3. c) solid type (T3);
4. d) angle cut concave type (T4);
5. 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.