1/4 BSP General Fuel
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Laser Tools 5274 Butane Heating Torch
Part no: 5274Excl. Tax: £20.21 Incl. Tax: £24.25 -
Laser Tools 3483 Pipe Bender 3-in-1
Part no: 3483Excl. Tax: £21.06 Incl. Tax: £25.27
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