Subject: Re: Pipe thread standards?

From: Mark Winlund <[email-masked]>
Date: 14 Dec 1996 13:26:45 GMT

There is a British pipe thread that is very close, but not the same... BSP (British 
Standard Pipe?)

Regards, Mark

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From: [email-masked] (Theodore Henry Phares)
Date: Sat, 14 Dec 1996 02:25:03 -0800

Hi,

I have a vacuum cup with a 1/8" dia. nipple coming out of it. 
Unfortunately, the nipple is not threaded NPT, and I can't figure out what
it is.  It's close to 1/8" NPT, but not quite.  Could it be NPS?  Or is
there another pipe thread standard w/o a taper?  Is NPS usually used on
pneumatic/vacuum stuff like this?  To confuse the situation, I have some
coiled air line that has NPT fittings.  

So, I have to ask:

When and where is NPT used?  When is NPS used?

Are there common U.S. pipe thread standards in addition to NPT and NPS? 
How about metric?

Can anyone suggest any references?

Thanks in advance.

-- 
ted phares
 human engineering laboratory
  department of mechanical engineering
   university of california at berkeley
    me.berkeley.edu/hel

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From: [email-masked] (ERich10983)
Date: 14 Dec 1996 21:52:41 GMT

1/8 inch diameter fittings may be 10-32 thread.  Some of these have a
built in O'ring to do the sealing, so don't need a tapered thread with
teflon tape.  Try threading a nut on this.  That will tell you.  Clippard
is a good source for these fittings.

Earle Rich
Mont Vernon, NH

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From: [email-masked] (Gagemaker)
Date: 14 Dec 1996 23:44:11 GMT

Yes, BSPP is a standard. It uses a 55 degree included angle for the thread
form. If you would like specs, send me an E-mail.
                                               Steve Walker
                                               Hemco Gage
Steve Walker
[email-masked]
 "It's up to those who can to help those who can't."

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From: "Dennis A. Armstrong" <[email-masked]>
Date: 14 Dec 96 22:25:15 GMT

All pipe sizes have both an ANSI B2.1 taper thread and an American Standard
Straight Pipe Thread.  While we do commonly see the taper pipe and fittings
for water piping, the straight thread also has many common applications. 
One popular use for the 1/8 inch size is with lamp hardware.  Other
applications include non-pressure tight joints such as free fitting
mechanical joints for quick assembly and other applications like filler
plugs and hose couplings.  Your garden hose is actually a 3/4 straight pipe
fitting.  In this case, the seal is accomplished with a gasket.  Some
electrical conduit hardware also employs the straight pipe thread.
- 
Dennis A. Armstrong
[email-masked]

Theodore Henry Phares <[email-masked]> wrote in article
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