1/4 BSP General Fuel
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1/4" BSP Swivel Nut & Tail Brass To Suit 5/16" ID Fuel Hose Pipe Made in UK
Part no: D82/20/162Excl. Tax: $5.86 Incl. Tax: $7.03
The root diameter is 0.451" and there is 19 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 5/16" OD or 1/4" OD pipe.
Abbreviations: O.D. Outside Diameter - I.D. Inside Diameter - T.P.I. Threads Per Inch