2016BS ISO 3601-2:2016 Fluid power systems. O-rings. Housing dimensions for general applications
2012BS ISO 3601-1:2012 Fluid power systems. O-rings. Inside diameters, cross-sections, tolerances and designation codes
0000 BS ISO 3601-1:2008
1989BS 1806:1989 Specification for dimensions of toroidal sealing rings ('O'-rings) and their housings (inch series)
BS ISO 3601-2:2008 Fluid power systems - O-rings - Housing dimensions for general applications has been changed from BS 1806:1989 Specification for dimensions of toroidal sealing rings ('O'-rings) and their housings (inch series).