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ISO 3601-2:2025

Fluid power systems - O-rings - Part 2: Housing dimensions for general applications
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ISO 3601-2:2025

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

ISO 3601-2:2025

This document specifies the housing dimensions for class A O-rings for general industrial applications conforming to ISO 3601-1, as well as housing dimensions for class B O-rings used on selected metric-dimensioned hardware, e.g. fluid power cylinder bores and piston rods.

These O-rings are for use in general hydraulic and pneumatic applications without and with anti-extrusion rings (back-up rings). The dimensions of the O-rings (d1 and d2), size codes (SC) and tolerances conform to ISO 3601-1.

This document also addresses different design approaches in industry, and this is reflected in the table structures for hardware dimensions.

Using the O-ring as a starting point to design the optimal hardware dimensions is reflected in Tables 3, 5, and 8.

Using fixed hardware dimensions (i.e. bore/rod) and choosing the most appropriate O-ring to fit is reflected in Tables 4 and 6.

Housing dimensions for the O-rings intended for aerospace applications that are specified in ISO 3601-1 are addressed in Annex A.

NOTE 1: It is expected that O-ring housing dimensions for special applications be agreed upon between the O-ring manufacturer and the user.

NOTE 2: The term “housing”, in this document, is used to describe the groove or cavity, into which the O-ring is fitted, and the mating surface, which between them confine the O-ring.

SDO ISO: International Organization for Standardization
Document Number ISO 3601
Publication Date Not Available
Language en - English
Page Count 62
Revision Level
Supercedes
Committee ISO/TC 131/SC 7
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