Difference between MPT and NPT threads?

[p***@yahoo.com]

How can I tell by looking at it?

[s***@trailing-edge.com]

Post by p***@yahoo.com
How can I tell by looking at it?

MPT (M = male) is a male NPT.

I once actually tried to explain to someone why some threads are called
"male" and others "female". I failed completely. I won't try with you
either.

Tim.

[Percival P. Cassidy]

Post by s***@trailing-edge.com

Post by p***@yahoo.com
How can I tell by looking at it?

MPT (M = male) is a male NPT.
I once actually tried to explain to someone why some threads are called
"male" and others "female". I failed completely. I won't try with you
either.

I remember that when I was perhaps 8 or 9 years old I heard the plumber
who was working in our house refer to an "M and F" coupling. I asked
what this stood for, and he told me that it was short for "Male and
Female." When I asked why, he told me that I would understand when I was
older.

Perce

[m***@UNLISTED.com]

On Thu, 27 Jul 2006 13:41:19 -0400, "Percival P. Cassidy"

Post by Percival P. Cassidy

Post by s***@trailing-edge.com

Post by p***@yahoo.com
How can I tell by looking at it?

MPT (M = male) is a male NPT.
I once actually tried to explain to someone why some threads are called
"male" and others "female". I failed completely. I won't try with you
either.

I remember that when I was perhaps 8 or 9 years old I heard the plumber
who was working in our house refer to an "M and F" coupling. I asked
what this stood for, and he told me that it was short for "Male and
Female." When I asked why, he told me that I would understand when I was
older.
Perce

Do you understand yet?

I still dont understand because I have NEVER seen a pipe with either a
penis or a vagina. Have you? <lol>

(I did see several pipes that had nipples though, so I instantly knew
they were female) !!!!!!!!!!!! :)

[Frank Warner]

Post by m***@UNLISTED.com
On Thu, 27 Jul 2006 13:41:19 -0400, "Percival P. Cassidy"

Post by Percival P. Cassidy

Post by s***@trailing-edge.com

Post by p***@yahoo.com
How can I tell by looking at it?

MPT (M = male) is a male NPT.
I once actually tried to explain to someone why some threads are called
"male" and others "female". I failed completely. I won't try with you
either.

I remember that when I was perhaps 8 or 9 years old I heard the plumber
who was working in our house refer to an "M and F" coupling. I asked
what this stood for, and he told me that it was short for "Male and
Female." When I asked why, he told me that I would understand when I was
older.
Perce

Do you understand yet?
I still dont understand because I have NEVER seen a pipe with either a
penis or a vagina. Have you? <lol>
(I did see several pipes that had nipples though, so I instantly knew
they were female) !!!!!!!!!!!! :)

Hmmm. I'm a male, and I have nipples. What're you, some kind of
evolutionary freak?

-Frank

[m***@UNLISTED.com]

On Thu, 27 Jul 2006 14:59:54 -0700, Frank Warner

Post by Frank Warner

Post by m***@UNLISTED.com
On Thu, 27 Jul 2006 13:41:19 -0400, "Percival P. Cassidy"

Post by Percival P. Cassidy

Post by s***@trailing-edge.com

Post by p***@yahoo.com
How can I tell by looking at it?

MPT (M = male) is a male NPT.
I once actually tried to explain to someone why some threads are called
"male" and others "female". I failed completely. I won't try with you
either.

I remember that when I was perhaps 8 or 9 years old I heard the plumber
who was working in our house refer to an "M and F" coupling. I asked
what this stood for, and he told me that it was short for "Male and
Female." When I asked why, he told me that I would understand when I was
older.
Perce

Do you understand yet?
I still dont understand because I have NEVER seen a pipe with either a
penis or a vagina. Have you? <lol>
(I did see several pipes that had nipples though, so I instantly knew
they were female) !!!!!!!!!!!! :)

Hmmm. I'm a male, and I have nipples. What're you, some kind of
evolutionary freak?
-Frank

You DO??????
That's scarey......
Do men chase after you too????
I they do, get a bra :)

[Calvin Henry-Cotnam]

Post by Frank Warner
Hmmm. I'm a male, and I have nipples.

Did anyone else just think of cats and Robert De Niro in Meet the Parents?
--
Calvin Henry-Cotnam
"I really think Canada should get over to Iraq as quickly as possible"
- Paul Martin - April 30, 2003
-------------------------------------------------------------------------
NOTE: if replying by email, remove "remove." and ".invalid"

[Jonathan W]

Same with the pipe nipples themselves... Decisively male! Oh, and the traditional gender designations totally make sense to me in piping. Reminds me so much of the 'real thing', my mind remains in the gutter whenever I am laying pipe. Pun intended

[Chris Lewis]

Post by p***@yahoo.com
How can I tell by looking at it?

You can't. They're the same.

"MPT" means "male pipe thread". "FPT" means "female pipe thread".
"NPT" ("national pipe thread") is simply a generic term for
that same pipe thread, male or female.

In other words, "MPT" and "male NPT" means the same thing.

Similarly, MIP (male iron pipe) == MPT and FIP (female iron pipe) == FPT.

http://en.wikipedia.org/wiki/National_pipe_thread

[Richard J Kinch]

Post by Chris Lewis
"MPT" means "male pipe thread". "FPT" means "female pipe thread".
"NPT" ("national pipe thread") is simply a generic term for
that same pipe thread, male or female.

No, the "T" stands for "tapered", not "thread". As in NPS for straight
threads, etc. The designations "NPT", NPS, etc., are part of the national
standards (ANSI/ASME B1.20.1-1983 (R1992) etc).

"MPT" and "FPT" are bastardizations not in the standards. Likewise "FIP"
and "MIP": common galvanized or black pipe is steel, not iron, and besides
the thread standards have nothing to do with iron vs steel vs brass, etc.

[Stormin Mormon]

Just to confuse things. MPT is a subset of NPT. Because NPT can be MPT
or FPT. So, they aren't totally interchangable. Not to be a PIA, cause
a MPT would go nicely into a same size FPT, but can't guarantee that a
MPT would go into a NPT, only if it's a FPT NPT. If it were a MPT NPT,
that wouldn't work. So, if you have a NPT FPT on your SUV, you need a
MPT NPT, or you'll be SOL. KWIM? Then, you'll need a BFG, or BFH.
--
Christopher A. Young
You can't shout down a troll.
You have to starve them.
.

Post by p***@yahoo.com
How can I tell by looking at it?

You can't. They're the same.

"MPT" means "male pipe thread". "FPT" means "female pipe thread".
"NPT" ("national pipe thread") is simply a generic term for
that same pipe thread, male or female.

In other words, "MPT" and "male NPT" means the same thing.

Similarly, MIP (male iron pipe) == MPT and FIP (female iron pipe) ==
FPT.

http://en.wikipedia.org/wiki/National_pipe_thread

[Harry K]

Post by Stormin Mormon
Just to confuse things. MPT is a subset of NPT. Because NPT can be MPT
or FPT. So, they aren't totally interchangable. Not to be a PIA, cause
a MPT would go nicely into a same size FPT, but can't guarantee that a
MPT would go into a NPT, only if it's a FPT NPT. If it were a MPT NPT,
that wouldn't work. So, if you have a NPT FPT on your SUV, you need a
MPT NPT, or you'll be SOL. KWIM? Then, you'll need a BFG, or BFH.

I'm soooo confused.

Harry K

[Edwin Pawlowski]

Post by Harry K

Post by Stormin Mormon
Just to confuse things. MPT is a subset of NPT. Because NPT can be MPT
or FPT. So, they aren't totally interchangable. Not to be a PIA, cause
a MPT would go nicely into a same size FPT, but can't guarantee that a
MPT would go into a NPT, only if it's a FPT NPT. If it were a MPT NPT,
that wouldn't work. So, if you have a NPT FPT on your SUV, you need a
MPT NPT, or you'll be SOL. KWIM? Then, you'll need a BFG, or BFH.

I'm soooo confused.
Harry K

Not only that, it may even be BPPT. Looks the same, but no taper

[Peter Plumber]

replying to Stormin Mormon, Peter Plumber wrote:
All those TLAs! Is that because you're LDS? ;-)

--
for full context, visit https://www.homeownershub.com/maintenance/difference-between-mpt-and-npt-threads-132178-.htm

[Mark McKelvy]

Post by Chris Lewis
MPT and FIP (femal

Thank you!

[b***@sme-online.com]

Post by p***@yahoo.com
How can I tell by looking at it?

And you can tell it from machine-screw thread by the couple-degree
taper, not to mention the size. Guaranteed interference-fit, IOW.

J

[Richard J Kinch]

Post by b***@sme-online.com
Guaranteed interference-fit, IOW.

Threads that interfere are not necessarily interference-fit. Interference-
fit threads are not tapered.

[p***@yahoo.com]

Post by p***@yahoo.com
How can I tell by looking at it?

Okay thanks for your replies - but let me ask all of you this then
(this is the crux of the question):

I am trying to replace an air pressure gauge on a piece of equipment
(tire changer.) It has a male back mount. When I messure the diameter
of the threads I get more than 1/2" Is this considered 1/2" Male - NPT
? (It's more like 5/8") Or do I have some odd thing that is going to
cost me a fortune to replace. It doesn't appear to be tappered unless
it is "very" gradually tappered.

[r***@westnet.poe.com]

Post by p***@yahoo.com

Post by p***@yahoo.com
How can I tell by looking at it?

Okay thanks for your replies - but let me ask all of you this then
I am trying to replace an air pressure gauge on a piece of equipment
(tire changer.) It has a male back mount. When I messure the diameter
of the threads I get more than 1/2" Is this considered 1/2" Male - NPT
? (It's more like 5/8")

Pipe thread are sized to be on the OD of common pipe which is sized by the
Pipes nominal ID. Thus, 1/2" pipe is actually 0.840 inches in OD. 3/8"
pipe is 0.675 OD. So it would seem that you're looking at a 3/8 pipe
connection there if your 'more like 5/8"' observation is good. You can
check the pitch: 3/8NPT threads have 18 threads per inch, 1/2NPT has 14.

Easiest thing to do is to check it against some fittings of known size:
take it you local big box and screw some stuff from the plumbing aisle
onto it and see what fits.

Post by p***@yahoo.com
Or do I have some odd thing that is going to cost me a fortune to
replace.

Almost certanly not: if it's just a pressure gauge, you can even adapt it
to any old size and go from there.

Post by p***@yahoo.com
It doesn't appear to be tappered unless it is "very" gradually tappered.

The taper on NPT thread is about 1.75 degrees, about 3/4" in each foot,
it's easy to miss.


John

[Harry K]

Post by p***@yahoo.com

Post by p***@yahoo.com
How can I tell by looking at it?

Okay thanks for your replies - but let me ask all of you this then
I am trying to replace an air pressure gauge on a piece of equipment
(tire changer.) It has a male back mount. When I messure the diameter
of the threads I get more than 1/2" Is this considered 1/2" Male - NPT
? (It's more like 5/8") Or do I have some odd thing that is going to
cost me a fortune to replace. It doesn't appear to be tappered unless
it is "very" gradually tappered.

Most gauges will be 1/4" NPT. I just checked my well gauge and it is
1/4" NPT and measures roughly 1/2" OD by holding a tape measure to it.

Harry K

[too much information dude]

Post by Harry K
Most gauges will be 1/4" NPT. I just checked my well gauge and it is
1/4" NPT and measures roughly 1/2" OD by holding a tape measure to it.
Harry K

NPT is defined by ANSI/ASME standard B1.20.1.[3]

Pipe threads are different from machine-screw and bolt threads. Those are
designated NC (national coarse) and NF (national fine.) The biggest
difference is the taper on pipe threads.

The taper rate for all NPT threads is 1 in 16 (3⁄4 inch per foot or 62.5
millimeters per meter) measured by the change of diameter (of the pipe
thread) over distance. The angle between the taper and the center axis of
the pipe is tan−1(1⁄32) = 1.7899° = 1° 47′ 24″.

Nominal Pipe Size (NPS) is loosely related to the inside diameter of
Schedule 40 pipe. Because of the pipe wall thickness, the actual diameter
of the threads is larger than the NPS, considerably so for small NPS. Pipe
of other schedules with a certain NPS has different wall thickness, but
the same outside diameter and thread profile as Schedule 40, so the inside
diameter of the pipe is therefore different from the NPS.

Thread form[edit]NPTE and NPS threads have a 60° included angle and have
a Sellers thread form (flattened peaks and valleys).

NPTF[edit]A semi-compatible variant called National Pipe Taper Fuel
(NPTF), also called Dryseal American National Standard Taper Pipe Thread,
defined by ANSI B1.20.3, is designed to provide a more leak-free seal
without the use of teflon tape or other sealant compound. NPTF threads are
the same basic shape but with crest and root heights adjusted for an
interference fit, eliminating the spiral leakage path.



--

[HomeOwnersHub Advisor]

Post by p***@yahoo.com
How can I tell by looking at it?

MPT (Male Pipe Thread) and NPT (National Pipe Thread) are both types of tapered threads used for connecting pipes and fittings. The main difference between the two is that NPT threads have a sealant applied to them, typically Teflon tape or pipe dope, to create a leak-proof seal when the fitting is tightened. MPT threads do not have this sealant and rely on the threads themselves to create a seal when the fitting is tightened.

There is no quick way to tell the difference between MPT and NPT threads just by looking at them, but here are a few things you can look for to help identify the thread type:

NPT threads have a tapered design, which means the diameter of the threads gradually decreases as you move towards the end of the pipe or fitting. MPT threads are parallel, which means the diameter of the threads remains consistent along the entire length of the pipe or fitting.

NPT threads typically have a sharper angle, around 60 degrees, compared to MPT threads which typically have a more gradual angle of about 55 degrees

NPT threads have an angle of about 1/16" per foot, which means the distance between threads decreases as you move towards the end of the pipe or fitting. This is known as the "taper" of the thread. MPT threads are parallel and do not have this taper.

You can also use a thread gauge to check the threads, it will tell you the thread pitch and if it's tapered or parallel.

It's important to use the correct thread type when connecting pipes and fittings, as using the wrong type can lead to leaks or poor performance. If you're unsure which thread type you have, it's always best to consult the manufacturer or consult a professional

[%%]

On Thu, 26 Jan 2023 17:32:16 +1100, HomeOwnersHub Advisor

Post by HomeOwnersHub Advisor

Post by p***@yahoo.com
How can I tell by looking at it?

MPT (Male Pipe Thread) and NPT (National Pipe Thread) are both types of
tapered threads used for connecting pipes and fittings. The main
difference between the two is that NPT threads have a sealant applied to
them, typically Teflon tape or pipe dope, to create a leak-proof seal
when the fitting is tightened. MPT threads do not have this sealant and
rely on the threads themselves to create a seal when the fitting is
tightened.
There is no quick way to tell the difference between MPT and NPT threads
just by looking at them, but here are a few things you can look for to
NPT threads have a tapered design, which means the diameter of the
threads gradually decreases as you move towards the end of the pipe or
fitting. MPT threads are parallel, which means the diameter of the
threads remains consistent along the entire length of the pipe or
fitting.
NPT threads typically have a sharper angle, around 60 degrees, compared
to MPT threads which typically have a more gradual angle of about 55
degrees
NPT threads have an angle of about 1/16" per foot, which means the
distance between threads decreases as you move towards the end of the
pipe or fitting. This is known as the "taper" of the thread. MPT threads
are parallel and do not have this taper.
You can also use a thread gauge to check the threads, it will tell you
the thread pitch and if it's tapered or parallel.
It's important to use the correct thread type when connecting pipes and
fittings, as using the wrong type can lead to leaks or poor performance.
If you're unsure which thread type you have, it's always best to consult
the manufacturer or consult a professional.

You're 15 years late, you stupid bot.

[Peeler]

On Thu, 26 Jan 2023 19:19:58 +1100, %%, better known as cantankerous
trolling senile geezer Rodent Speed, wrote:

<FLUSH the abnormal trolling senile cretin's latest trollshit unread>