Historical
BS ISO 3601-1:2008
Fluid power systems. O-rings. Inside diameters, cross-sections, tolerances and designation codes (British Standard)
ISO 3601-1:2008 specifies the inside diameters, cross-sections, tolerances and designation codes for O-rings used in fluid power systems for general industrial and aerospace applications.
The dimensions and tolerances specified in ISO 3601-1:2008 are suitable for any elastomeric material, provided that suitable tooling is available.
British Standards Institution [bsi]