matt.c
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| posted on 19/4/09 at 09:33 PM |
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Is 1/8th NPT the same as M10x1?
Need to order my sender unit for my water temp guage so can you help? ^^^^^^^^^
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vinny1275
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| posted on 19/4/09 at 09:35 PM |
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Don't think so, NPT are tapered threads iirc....
Cheers
Vince
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JoelP
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| posted on 19/4/09 at 09:35 PM |
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i believe not, on the basis that google says you can buy adapters between them. May well be wrong though...
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owelly
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| posted on 19/4/09 at 09:39 PM |
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1/8" NPT has 27 threads per inch and 10mmx1 has 1 thread per mm. So no. They're not the same!
http://www.ppcmag.co.uk
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matt.c
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| posted on 19/4/09 at 09:46 PM |
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oh dear what the feck do i do now! 
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AdrianH
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| posted on 19/4/09 at 10:24 PM |
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1/8th NPT is as posted above 27 TPI with a taper. I ended up making an adapter myself after some messing around for my brake system.
For use with temp gauges there are adapters, what thread is on the temp gauge?
You could have a browse on here.
http://www.earls.co.uk/earls/index.html
or
https://www.europaspares.com/INSTRUMENTS/SENDER_ADAPTORS,_ETC/
Adrian
[Edited on 19-4-09 by AdrianH]
[Edited on 19-4-09 by AdrianH]
Why do I have to make the tools to finish the job? More time then money.
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BenB
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| posted on 19/4/09 at 10:29 PM |
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Get an adaptor as mentioned above???
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hicost blade
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| posted on 19/4/09 at 10:40 PM |
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I hope its your sender which is the 1/8npt bit because all you need to do is run an 1/8npt tap into to the M10x1 hole, it will open it out and cut it
perfectly.
M10x1 and 1/8npt are almost exactly the same pitch and the small end of the 1/8npt taper is almost an exact match to the M10x1, the tap will just wind
in without any cross thread at all.
Don’t go too far though, there is nothing like a sloppy taper!
Don’t use ptfe either as the sender will not earth properly (thread lock works a treat).
Job done.
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mad4x4
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| posted on 20/4/09 at 06:43 AM |
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YOu should n;t be using PTFE or thread lock on an NPT thread .
NPT is an interference Fit therfore creates a metal to metal seal.
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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Liam
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| posted on 20/4/09 at 12:33 PM |
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The hydraulic engineer in me is shuddering!
Standard NPT is not a sealing thread and should be used with a sealing tape/compound. The NPTF derivative is a sealing thread.
And 'adapting' NPT to metric with a tap - eek! We occasionally mate NPT to BSP at 1/2" and 3/4" where the pitch is the same,
but it's still a temporary get-out-of-jail-free bodge.
Your cooling system is critical and operates at an appreciable pressure - I'd recommend getting the correct fittings/adaptors and doing it
properly.
Sorry that's not in true locoster spirit
Liam
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hicost blade
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| posted on 20/4/09 at 04:30 PM |
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Sorry to be augmentative but
M10x1 to 1/8npt is easily done without a 'bodge' and has been 1,000,000's of times by 1,000,000's of people.
But I do agree 1/8npt to M10x1 is
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MikeRJ
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| posted on 20/4/09 at 05:34 PM |
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quote:
Originally posted by Liam
Your cooling system is critical and operates at an appreciable pressure
It would take an exceedingly poorly made thread to fail at the 15PSI or so that cooling systems run at.
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hicost blade
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| posted on 20/4/09 at 05:36 PM |
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quote:
Originally posted by MikeRJ
quote:
Originally posted by Liam
Your cooling system is critical and operates at an appreciable pressure
It would take an exceedingly poorly made thread to fail at the 15PSI or so that cooling systems run at.
Agreed
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minitici
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| posted on 20/4/09 at 05:41 PM |
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If you need an 1/8 NPT tap - they are sometimes hard to find and can be expensive - do what I did and but a complete tap and die set which includes
the 1/8 NPT tap - all for less than one tap!
e-bay link
I needed one to tap the R1 5VY oil cooler bolt for an oil pressure sender.
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