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

[Bill Dickerson]

And most folks have dropped the "taper" because of the length, I suspect.
Ken also sent me some details from the society of mechanical engineers.
The other fellow was more correct and I've told him, but it's also partly
semantics (not to be confused with Symantec!)

Bill 

-----Original Message-----
From: sel-bounces at lists.stationary-engine.com
[mailto:sel-bounces at lists.stationary-engine.com] On Behalf Of Tommy Turner
Sent: Monday, January 31, 2005 10:21 PM
To: The SEL email discussion list
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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