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where do you measure nptf threads?
blakep82 - 20/6/09 at 05:19 PM

http://www.edsmotorsport.co.uk/straight-union-68-p.asp

1/8" is very very small...

miikae - 20/6/09 at 06:00 PM

this may help you

Mike

blakep82 - 20/6/09 at 06:13 PM

certainly does mike! thanks for that, so the hole is 0.4 of and inch, so its 1/8" lol terrible system

miikae - 20/6/09 at 06:28 PM

Yes it has always confused me from what i remember i think it revolves around the pipe bore size , nominal bore.

Mike

blakep82 - 20/6/09 at 06:29 PM

yeah, its something like that. all sorted now, i can go order my fuel lines and fittings, except they don't seem to have the hose in stock. great...

miikae - 20/6/09 at 06:36 PM

One door opens and another slams in your face , argh thats life as we know it.
Keep smiling.

Mike

blakep82 - 20/6/09 at 06:39 PM

they've got a ebay store which seem to show stock, so maybe i'll just call them

daviep - 21/6/09 at 12:59 AM

quote:
Originally posted by blakep82
certainly does mike! thanks for that, so the hole is 0.4 of and inch, so its 1/8" lol terrible system


I could be reading this wrong but I would suspect that you are possibly looking for 1/4" npt.

The measurement of the external 1/8 npt is 0.405" so there for the measurement of the internal hole would have to be smaller (2x depth of thread)

1/8" npt has an internal measurement of 11/32" (0.34" or 8.7mm)

1/4" npt has an internal measurement of 15/32" (0.47" or 11.9mm)

Sorry if I've picked you up wrong.

Davie

daviep - 21/6/09 at 01:03 AM

Also gut feeling is that 1/8" npt would be too small for a fuel system unless it was for a gauge or something similar.

Again sorry if I'm barking up the wrong tree.

Cheers
Davie