34mm rad hose adaptor npt fitting Q

[Bigsyke]

I got 2 of those rad hose adaptors for my breather tank setup. However the 1/8th npt fittings arent threading in all the way - maybe 1/2 if even. Its a very very tight fit, as if im crossthreading, however ive tried about 4 different fitting styles and all are the same.

Isnt the NPT fittings supposed to be a looser fit, because you have to use teflon tape? I couldnt even use thread locker because the fit is so tight. I even snapped a fitting half way in, which required me to order another 34mm rad hose adaptor.

[orion::S14]

No...NPT is a tight fight, it's tapered.

It get's tighter as you turn it...so there's no need for teflon tape or anything.

- Brian

[Bigsyke]

Sweet, is there a general torque setting for it? I think I snapped the other fitting at about 15lbs.

[DreamN]

Hand tight should be more than enough.

[j87w]

No...NPT is a tight fight, it's tapered.

It get's tighter as you turn it...so there's no need for teflon tape or anything.

- Brian


What do you use teflon tape on? Teflon tape (PTFE) is designed for pipe thread (NPT) . You can get away without using teflon tape on pipe but I have had much better luck when using teflon to eliminate leaks. Thread seal tape - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Thread_seal_tape)


Also when tapping NPT threads the general rule I have always gone by is to run the tap in 2/3 way. So you should never run up the fitting until its out of threads.

[japslapsilvia]

what hose adapter are u using? greddy sard? and are u using a provided fitting or did u just get a NPT fitting?

if you are using a Jap brand (greddy sard etc) then the hole is not NPT it BSPT or PT, they are a little different from NPT.

[Bigsyke]

I got one off ebay for $15

34mm Water temp Gauge Radiator Hose Sensor Adaptor:eBay Motors (item 290305177970 end time Jun-21-09 21:41:50 PDT) (http://cgi.ebay.com/ebaymotors/34mm-Water-temp-Gauge-Radiator-Hose-Sensor-Adaptor_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el1 116QQhashZitem4397897972QQitemZ290305177970QQptZMo torsQ5fCarQ5fTruckQ5fPartsQ5fAccessories)