BS ISO 3601-2:2008 - Fluid power systems. O-rings. Housing dimensions for general applications – BSI British Standards

BS ISO 3601-2:2008

Fluid power systems. O-rings. Housing dimensions for general applications

Status : Superseded, Withdrawn   Published : August 2008 Replaced By : BS ISO 3601-2:2016,

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In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under pressure within an enclosed circuit. To avoid leakage or to seal different chambers of a component from each other sealing devices are used. O-rings are one type of sealing devices. To seal properly, an O-ring has to be used in an appropriate housing for the application.

BS ISO 3601-2:2008 specifies the housing (gland) dimensions for class A O-rings for general industrial applications conforming to BS ISO 3601-1, as well as housing dimensions for class B O-rings used on selected metric-dimensioned hardware. These O-rings are for use in general hydraulic and pneumatic applications without and with anti-extrusion (back-up) rings. The dimensions, size codes and tolerances of the O-rings conform to BS ISO 3601-1.

BS ISO 3601-1:2008 incorporates O-ring sizes corresponding to those previously given in BS 1806 in the size tables for general industrial applications. This part of the standard gives specifications for the housing sizes for these O-rings.

BS ISO 3601-2:2008 contains:

  • Normative references 
  • Terms and definitions
  • Symbols 
  • O-ring housings: typical O-ring applications; surface roughness; housing dimensions; corners and edges of undefined shape; lead-in chamfer; calculation of housing dimensions for radial sealing applications
  • Requirements: housing dimensions, determining O-ring size for custom housing dimensions; gland fill consideration in design of housings; temperature consideration in design of housings
  • Identification statement

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

Together with BS ISO 3601-1:2008, BS ISO 3601-2:2008 supersedes BS 1806:1989 which is withdrawn.

Standard NumberBS ISO 3601-2:2008
TitleFluid power systems. O-rings. Housing dimensions for general applications
StatusSuperseded, Withdrawn
Publication Date29 August 2008
Withdrawn Date31 July 2016
Normative References(Required to achieve compliance to this standard)ISO 5598, ISO 4287:1997, ISO 3601-1:2008, ISO 8015, ISO 3601-4
Informative References(Provided for Information)ISO 8785, SAE MAP 3340, ISO 286-2, ISO 286-1, ISO 3601-3, EN 3748, ISO 1101:2017, ISO 13715:2017, ISO 4288, ISO 1302
ReplacesBS 1806:1989
International RelationshipsISO 3601-2:2008
Draft Superseded By07/30144373 DC
DescriptorsToroidal sealing rings, Dimensions, Hydraulic transmission systems, Rod seals, Diameter, Stuffing boxes, Hydraulic equipment, Aircraft components, Size, Sealing rings, Seals, Designations
Title in FrenchTransmissions hydrauliques et pneumatiques. Joints toriques. Dimensions des logements pour applications générales
Title in GermanFluidtechnik. O-Ringe. Maße der Einbauräume für allgemeine Anwendungen
ISBN978 0 580 56329 4
File Size716 KB

*To ask about withdrawn titles contact the
Customer Relations, +44 345 086 9001
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