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Thread: NC and NCS series Threads

  1. #1
    Associate Engineer
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    Apr 2012
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    Belflower, CA
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    NC and NCS series Threads

    Gentlemen,

    I have to design a valve which required the folowing threads:

    Internal: 7/16-14 NCS-1F and 1/2-13 NCS-1F
    External: 7/16-14 NC-5HF and 1/2-13 NC-5HF

    I can't find specifications for this kind of threads (minor, major and pitch diameters, tools, etc.).
    Can you help me?
    Thank you and season greetings.

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
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    2,206
    Quote Originally Posted by bcojocneanu View Post
    Gentlemen,

    I have to design a valve which required the folowing threads:

    Internal: 7/16-14 NCS-1F and 1/2-13 NCS-1F
    External: 7/16-14 NC-5HF and 1/2-13 NC-5HF

    I can't find specifications for this kind of threads (minor, major and pitch diameters, tools, etc.).
    Can you help me?
    Thank you and season greetings.
    I suspect that the "S" is actually a "5" and the "1" is actually a "I" in the thread designation.

    So, if I'm correct the designation should actually be:

    Internal 7/16-14 NC5IF and 7/16-14 NC5IF

    and

    External: 7/16-14 NC5HF and 1/2-13 NC5HF

    I ~ think this is an interference thread designation of the American National Course Fit, 60 degree Entire Ferrous class "5".
    Last edited by Kelly Bramble; 12-18-2012 at 08:03 PM.

  3. #3
    Associate Engineer
    Join Date
    Apr 2012
    Location
    Belflower, CA
    Posts
    7
    Thank you, Kelly. It makes sense.
    Happy Holidays!

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