I really dislike NPT.

NPT is National Pipe Thread not to be confused with MPT which is a Male NPT – NPT could also be FPT (female). Don’t put the F at the end because then you’ll get NPTF which is Tapered Fine, a.k.a. Dryseal, although FPT and MPT can be used with NPTF without a problem. MPTF is male NPTF and can be used with NPTF, NPT, NPSM, and NPSH. NPSM is straight mechanical, not tapered. NPSH is straight hose. MPSH is go with FPSM and FPSH but FPSH is good with MPSM, MPT, MPTF, AND MPSH. BSPT is British Standard Pipe Taper, and can’t be used with NPT or NPTS. Meanwhile, NPS is Nominal Pipe Size not National Pipe Size and deals in schedules not threads not to be confused with NPF which is the National Psoriasis Foundation.

I really dislike Plumbing threads.

3 thoughts on “I really dislike NPT.

  • 4/14/2009 at 8:40 pm
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    A “monkey wrench” with a very long handle usually solves most of the problems this variety presents.

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  • 4/15/2009 at 8:34 am
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    I’m glad somebody else understands how annoying plumbing is. Even in the limited amount I deal with it, Mike D has left out the whole arena of compression fittings, 37 vs 45 degrees, flare fittings, BSP vs. JIC, hydraulic fittings, double vs. single flares, and ORFS (O-Ring Face Seal), all of which may or may not be several names for the same thing.
    Luckily, I know just enough about all of this to royally muck things up whenever I get involved with them. Hooray!

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  • 4/15/2009 at 8:22 pm
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    I recently learned how to cut tapered threads on a lathe. And you can cut them to any pitch or diameter you want, so you can really mess with the poor soul who has to work on your project next. 8″-200? Why not!!

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