O-Ring BS

BS O-rings follow the British Standard BS1806, defining standard inside diameters and cross-sections for sizes BS001 to BS932, identical in dimensions to the AS568 US system.
Overview of BS O-Ring Standards
The BS1806 standard is the British Standard sizing system for O-rings, widely used in UK engineering and manufacturing 
It defines inside diameters (ID) and cross-sections (CS) for standard O-ring sizes, originally based on imperial measurements but also expressed in metric units 
The standard covers sizes from BS001 to BS932, with cross-sections ranging from 1.27 mm to 7 mm

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