1/4 BSP General Fuel
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14-16m 304 Stainless Steel Fuel Air Water LineMINI HOSE CLAMPS PACK OF 10
Part no: MHCSS14-16Excl. Tax: NZ$17.69 Incl. Tax: NZ$21.22
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