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BS ISO 3601-1:2012+A1:2019
Fluid power systems. O-rings Inside diameters, cross-sections, tolerances and designation codes (British Standard)
ISO 3601-1:2012 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 3601-1:2012 are suitable for any elastomeric material, provided that suitable tooling is available.
British Standards Institution [bsi]