ISO 3601-4:2008 PDF

Name: ISO 3601-4:2008 — Fluid power systems — O-rings — Part 4: Anti-extrusion rings (back-up rings)
SKU: ISO 3601-4:2008
Price: 25 EUR
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Fluid power systems — O-rings — Part 4: Anti-extrusion rings (back-up rings)

Название (английский):

ISO 3601-4:2008

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

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 27 мая 2008 г.
Издание:: ISO IS 3601 edition 1 version 1
ICS:: 23.100.60

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Описание (английский):

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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 3601-4:2008 - "Fluid power systems - O-rings - Part 4: Anti-extrusion rings (back-up rings)" specifies the form, dimensions and tolerances for anti-extrusion (back-up) rings used with O-rings in fluid power systems. The standard covers five types of back-up rings (spiral T1; angle cut T2; solid T3; angle cut concave T4; solid concave T5) and links their use to selected O-ring sizes (ISO 3601-1) and housing dimensions (ISO 3601-2). It also gives guidance on materials, positioning in housings and a standardized designation code for procurement and specification.

Key topics and technical requirements

Types of anti-extrusion rings: Definitions and intended use for T1–T5, including assembly considerations and suitability for pressure/temperature ranges.

Spiral (T1) typically for ~10–20 MPa (100–200 bar) or where assembly ease is needed.
Angle cut (T2) and solid (T3) preferred for higher pressures (>20 MPa); T3 is recommended for extreme conditions (e.g., >25 MPa and >135 °C).
Concave variants (T4, T5) are designed to accommodate and retain O-ring shape under high pressure.

Dimensions and tolerances: Detailed requirements for axial and radial widths, inside/outside diameters, spiral gap dimensions and tolerances tied to O-ring cross-section and housing geometry.

Positioning: Guidance on placement of one or two anti-extrusion rings in piston and rod housings depending on pressure direction and application (static vs dynamic).

Materials: Preferred materials (unfilled PTFE, PTFE filled with glass/carbon/bronze, polyamide, thermoplastics, polyurethane) and advice to consult suppliers for material selection based on operating conditions.

Designation code: A clear format for naming/back-up ring parts for unambiguous ordering and documentation.

Applications and practical value

Used in hydraulic and pneumatic equipment to prevent O-ring extrusion between mating metal parts (e.g., piston-to-bore, rod-to-housing), improving seal life and system reliability.

Applicable to designers, sealing-device engineers, OEMs and maintenance teams specifying seals for cylinders, valves and actuators in high-pressure or high-temperature fluid power systems.

Helps standardize procurement, reduce fitment errors and ensure interchangeability across suppliers by defining dimensional and material criteria.

Related standards

ISO 3601-1 (O-ring sizes and designation codes)

ISO 3601-2 (Housing dimensions for general applications)

ISO 3601-3 (Quality acceptance criteria)

ISO 3601-5 (Elastomer suitability for industrial applications)

Keywords: ISO 3601-4:2008, anti-extrusion rings, back-up rings, O-rings, fluid power systems, PTFE, piston sealing, rod sealing, dimensions and tolerances.

ISO 3601-4:2008 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and practical value

Who should use this standard

Related standards

Технические детали

ISO 3601-1:2012/Amd 1:2019

Fluid power systems — O-rings — Part 1: Inside diameters, cross-sections, tolerances and designation codes —…

ISO 3601-2:2008

Fluid power systems — O-rings — Part 2: Housing dimensions for general applications

ISO 3601-3:2005/Amd 1:2018

Fluid power systems — O-rings — Part 3: Quality acceptance criteria — Amendment 1

SIST ISO 3601-5:2016

Fluid power systems - O-rings - Part 5: Specification of elastomeric materials for industrial applications