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Thread: Need help figuring out NPT thread fit dimensions

  1. #1
    Associate Engineer
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    Jun 2014
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    Need help figuring out NPT thread fit dimensions

    Hey all, I am currently designing some plugs that will seat into npt threads. I have the machinery handbook and it is not giving me what seems to me the correct dimensions for a plug to seat into a female npt pipe and seal and protect the threads. What dimension should I use from the handbook or does anyone know this type of information? Thanks.

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
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    ot giving me what senms to me the correct dimensions for a plug to seat into a female npt pipe and seal and protect the threads.


    Because, why, and what happened?

  3. #3
    Associate Engineer
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    Jun 2014
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    For people that need to protect their threads during shipping, storage, etc. I am trying to find out what sizes can fit into the female end. Like on regular UNC threads and everything I can just take the minor diameter and use that dimension... NPT is a lot different and is quite a bit more confusing... I am just looking for the dimensions of the inside diameter of NPT that a plug can seat into under compression fit...

  4. #4
    Technical Fellow Kelly_Bramble's Avatar
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    I would search the internet for "NPT Thread Protectors". Lots on competition out there and you can those things in bulk really cheap.

  5. #5
    Technical Fellow jboggs's Avatar
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    Check this company. They should be able to answer all your questions.
    http://www.caplugs.com/

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