1/8" BSP Small Fuel

British Standard Pipe (BSP) is based on the inside diameter (I.D) of the pipe - not the outside diameter (O.D) of the thread, which in the case 1/8" BSP has a O.D. of 0.383"
The root diameter is 0.337" and there is 28 T.P.I.
The motoring industry use the outside diameter of the pipe for it's size and for 1/4" BSP you have the options of 3/16" OD or 1/8" OD pipe.

Abbreviations: O.D. Outside Diameter - I.D. Inside Diameter - T.P.I. Threads Per Inch

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