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

[George/Helen Myers]

Page 1347 of 18th Edition of the Machinery's Handbook indicates that;
NPT refers to it as "American National Standard Taper Pipe Thread".  Which word do you want to drop?

Helen
George L. & Helen S. Myers
The Ottawa Caretakers   ottawa at pa.net
http://albums.photo.epson.com/j/AlbumList?u=1751540
----- Original Message ----- 
  From: Tommy Turner 
  To: The SEL email discussion list 
  Sent: Monday, January 31, 2005 11:20 PM
  Subject: Re: [SEL] OT - what is NPT REALLY........


  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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