what is specification for 1/8 npt 27 tpi thread?

I am mfg. of brass adopter. i want to do 1/8 npt 27 tpi thread for male adopter. so what should i do ?

is it taper turning on brass rod ? 0.375" to 0.400 before threading ? any one help me?


i need 1/8 npt 27 tpi thread 0.355" long. what is rod dia meter before threading?

5 Answers

  • 9 years ago
    Favorite Answer

    BALAK covered the details but, just so you know, the taper is built into the tap or die that you use to thread the part.

    Hope this helped.

  • wexler
    Lv 4
    4 years ago

    Npt Tpi

  • 9 years ago

    Below noted are the details of the specification for 1/8" national pipe thread

    spcn 1/8" NPT

    Thread per inch 27

    Normal lenghth of thread 3/8"

    Nominal outside diameter 0.405"

    Taper required 1 degree 47 minutes

    Drill bit to be used for female thread size ' R'

    truncation of roots and crests are flat

    thread angle 60o

    Source(s): Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose): http://www.engineeringtoolbox.com/npt-national-pip...
  • Anonymous
    6 years ago

    if you need 1/8 npt 27 tpi thread gauge for your thread checking, please contact me


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  • Anonymous
    9 years ago

    The rest of the world uses the metric system, catch up.

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