Fluid power systems — O-rings — Part 4: Anti-extrusion rings (back-up rings)

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.

Transmissions hydrauliques et pneumatiques — Joints toriques — Partie 4: Bagues anti-extrusion

General Information

Publication Date
Current Stage
9093 - International Standard confirmed
Completion Date
Ref Project

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ISO 3601-4:2008 - Fluid power systems -- O-rings
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Fluid power systems — O-rings —
Part 4:
Anti-extrusion rings (back-up rings)
Transmissions hydrauliques et pneumatiques — Joints toriques —
Partie 4: Bagues anti-extrusion

Reference number
ISO 3601-4:2008(E)
ISO 2008

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ISO 3601-4:2008(E)
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ISO 3601-4:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Symbols .2
5 General requirements related to O-ring housings .2
6 Types of anti-extrusion (back-up) rings .3
6.1 Spiral type, T1 .3
6.2 Angle cut type, T2.5
6.3 Solid type, T3.5
6.4 Angle cut concave type, T4 .6
6.5 Solid concave type, T5 .7
7 Positioning of anti-extrusion rings in housings.8
8 Anti-extrusion ring designation code and materials.8
8.1 Designation code.8
8.2 Materials .9
9 Dimensions and tolerances .9
9.1 Axial and radial widths of anti-extrusion rings.9
9.2 Outside diameters of anti-extrusion rings for piston sealing applications.10
9.3 Inside diameters of anti-extrusion rings for rod seali

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