[SEL] OT - what is NPT REALLY........

[Tommy Turner]

Bill,

    I think possibly you're both right.  Read the text below that I 
copied from a site.  I think the "proper" name of NPT is "National Pipe 
Taper Thread"

Tommy Turner
Magnolia, KY


  NPT- National Pipe Taper Threads - ANSI B1.20.1 


    NPT  pipe threads - dimensions according ANSI/ASME B1.20.1

Common American National Standard Pipe Taper Threads 

    * NPT - National Pipe Taper Thread
    * FPT - female (internal) National Pipe Taper threads 
    * MPT - male (external) National Pipe Taper threads 
    * NPTF - Dryseal American National Standard Taper Pipe Thread (ANSI
      B1.20.3)

For NPT threads a sealant compound or Teflon tape must be used for a 
leak-free seal. For NPTF no sealant is needed for a sealing.

Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, 
General Purpose):

    * tapered thread 1o 47'
    * truncation of roots and crests are flat
    * 60o thread angle
    * pitch is measured in threads per inch





Bill Dickerson wrote:

> 
>Need word from experts - not "opinions" so I can avoid a pissing match with
>someone.
>
>NPT - I've been told national pipe thread.
>I'm BEING told, no, it's national pipe taper
>
>I showed a fellow a site by Kohler, the plumbing fixture folks, that states
>national pipe thread, he came backwith an engineers toolbox site that says
>national pipe taper.
>
>If I'm wrong, I want to know so I can go back and tell him he's
>right.........
>
>Bill
>
>
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