1/4 BSP General Fuel
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10-16mm W1 Zinc Coated Steel Clip Fuel Air Water Worm Hose Clamp 10 Pack
Part no: W1HC10-16Excl. Tax: £2.28 Incl. Tax: £2.74 -
10-16mm 304 Stainless Steel Clip Fuel Air Water Worm Hose Clamp 10 Pack
Part no: STSTHC10-16Excl. Tax: £7.22 Incl. Tax: £8.66
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