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Measuring Threaded Female Things
01-20-2018, 08:43 AM
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#1
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Join Date: Jun 2006
Posts: 12,880
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Measuring Threaded Female Things
Hey, don't blame me for the provocative thread title. It's appropriate!
While installing our new range, I made a wasted trip to the hardware store, and this is why:
I measured the gas input threaded female "port" and determined that it was larger than half-inch:
Turns out, it did indeed mate with a half-inch adapter. Perhaps "half-inch" refers to the inner diameter?
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Al
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01-20-2018, 08:46 AM
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#2
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Thinks s/he gets paid by the post
Join Date: May 2014
Posts: 1,867
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Click bait alert!
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01-20-2018, 08:48 AM
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#3
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Join Date: Jul 2008
Posts: 35,712
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WARNING: Things are often smaller than they appear to be.
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"Old age is the most unexpected of all things that happen to a man" -- Leon Trotsky (1879-1940)
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01-20-2018, 08:49 AM
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#4
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Join Date: Mar 2003
Posts: 18,085
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I run into this all the time with reloading stuff, where a difference if a thousandth of an inch can make a real difference. A pair of digital calipers can help a lot.
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"All animals are equal, but some animals are more equal than others."
- George Orwell
Ezekiel 23:20
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01-20-2018, 08:58 AM
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#5
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Thinks s/he gets paid by the post
Join Date: Oct 2013
Location: Cholula
Posts: 1,595
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Hmmm.....only another half-inch?
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01-20-2018, 09:01 AM
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#6
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Thinks s/he gets paid by the post
Join Date: Dec 2014
Location: St. Charles
Posts: 3,919
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Actually, in the case of pipe size, the stated size is "nominal". Depending on the pipe size and wall thickness it may not match either the inside or outside diameter. In smaller size pipe, the OD is always greater than the nominal size.
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If your not living on the edge, you're taking up too much space.
Never slow down, never grow old!
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01-20-2018, 09:15 AM
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#7
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Join Date: Jul 2014
Location: Spending the Kids Inheritance and living in Chicago
Posts: 17,099
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Well I'm disappointed I clicked on this thread
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01-20-2018, 09:31 AM
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#8
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Moderator
Join Date: Feb 2010
Location: Flyover country
Posts: 25,362
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Size matters.
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I thought growing old would take longer.
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01-20-2018, 09:37 AM
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#9
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Moderator
Join Date: Nov 2014
Posts: 9,182
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Quote:
Originally Posted by CardsFan
Actually, in the case of pipe size, the stated size is "nominal". Depending on the pipe size and wall thickness it may not match either the inside or outside diameter. In smaller size pipe, the OD is always greater than the nominal size.
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So how do you get the right size from the store? Buy various sizes and return the ones that don't work? I agree with OP, That doesn't look like 1/2 inch. I would have bought 3/4.
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01-20-2018, 09:47 AM
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#10
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Full time employment: Posting here.
Join Date: Aug 2014
Posts: 584
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Pipe is done by the inside diameter. But even then you have different thread types and fine vs coarse. For nuts and bolts you can get a plastic template or something like a giant keyring with small threaded segments/nuts to test the real part to know what the thread is. Never seen that for pipe before but you could make a test board like they often have in the plumbing sections of the hardware store.
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01-20-2018, 10:14 AM
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#11
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Thinks s/he gets paid by the post
Join Date: Apr 2016
Location: Dutchess County
Posts: 1,599
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Quote:
Originally Posted by Jerry1
So how do you get the right size from the store? Buy various sizes and return the ones that don't work? I agree with OP, That doesn't look like 1/2 inch. I would have bought 3/4.
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^This^
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01-20-2018, 10:22 AM
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#12
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Join Date: Sep 2005
Location: Northern IL
Posts: 26,896
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Quote:
Originally Posted by ArkTinkerer
Pipe is done by the inside diameter. .....
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ding-ding-ding - winner!
I too was confused about this for a long time, until you realize that the way they do it makes perfect sense. If you have a 1/2" pipe, you never want the flow cross-section diameter to go below 1/2". So the threaded parts associated with 1/2" pipe will always be quite a bit larger than 1/2". They need to account for wall size, threads, etc.
And that carries over to non-threaded adapters ("couplers") for copper pipe for example - the coupler's ID will be a fit to the OD of the copper pipe. If the coupler fit on the inside, it would restrict the pipe to less than 1/2".
And earlier it was mentioned these are nominal sizes, I think generally 1/2" is just a bit larger, to allow for tolerances and still not be < 1/2" (or whatever size you are dealing with).
Solid metal rods and "tubing" (versus pipe) are the opposite - the OD is what matters, and they might spec a wall thickness (which in turn sets the ID).
So, specific to the OP picture/question: "Turns out, it did indeed mate with a half-inch adapter. Perhaps "half-inch" refers to the inner diameter? " Yes, the ID of the male part should be ~ 1/2", so female ID needs to be large enough to accommodate all the wall thickness I mentioned. Is that what you found?
-ERD50
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01-20-2018, 10:30 AM
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#13
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Thinks s/he gets paid by the post
Join Date: Jan 2011
Location: Fair Lawn
Posts: 2,963
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My easily successful DIY jobs are far outnumbered by the multiple-attempts jobs. To try to minimize the latter, I learned one thing a long time ago. To wit, despite my best good faith measurement efforts, I buy different sizes and later return the ones that don't fit.
BTW, loved the thread title.
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01-20-2018, 10:56 AM
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#14
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Thinks s/he gets paid by the post
Join Date: Dec 2014
Location: St. Charles
Posts: 3,919
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Quote:
Originally Posted by ERD50
ding-ding-ding - winner!
I too was confused about this for a long time, until you realize that the way they do it makes perfect sense. If you have a 1/2" pipe, you never want the flow cross-section diameter to go below 1/2". So the threaded parts associated with 1/2" pipe will always be quite a bit larger than 1/2". They need to account for wall size, threads, etc.
And that carries over to non-threaded adapters ("couplers") for copper pipe for example - the coupler's ID will be a fit to the OD of the copper pipe. If the coupler fit on the inside, it would restrict the pipe to less than 1/2".
And earlier it was mentioned these are nominal sizes, I think generally 1/2" is just a bit larger, to allow for tolerances and still not be < 1/2" (or whatever size you are dealing with).
Solid metal rods and "tubing" (versus pipe) are the opposite - the OD is what matters, and they might spec a wall thickness (which in turn sets the ID).
So, specific to the OP picture/question: "Turns out, it did indeed mate with a half-inch adapter. Perhaps "half-inch" refers to the inner diameter? " Yes, the ID of the male part should be ~ 1/2", so female ID needs to be large enough to accommodate all the wall thickness I mentioned. Is that what you found?
-ERD50
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Here is a handy chart, showing OD, ID, and thread count for various sizes of standard wall (schedule 40) NPT (National Pipe Thread) pipe
https://www.engineeringtoolbox.com/a...pes-d_305.html
This one shows the variation in wall thickness and ID, depending on the schedule
http://www.tiogapipe.com/assets/files/pipe-chart.pdf
For each size pipe, the OD is constant. Only the ID and wall thickness vary based on the pressure rating.
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If your not living on the edge, you're taking up too much space.
Never slow down, never grow old!
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01-20-2018, 12:09 PM
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#15
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Join Date: Sep 2012
Posts: 11,702
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I'm more confused by Al's ruler than the problem at hand. Never seen one like that!
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01-20-2018, 12:26 PM
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#16
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Full time employment: Posting here.
Join Date: Jun 2015
Location: Redmond
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Quote:
Originally Posted by JoeWras
I'm more confused by Al's ruler than the problem at hand. Never seen one like that!
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I am more afraid with him doing gas piping not knowing pipe sizing or thread style. If he uses a flare adaptor thinking its a pipe thread, it will leak. Yikes!
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01-20-2018, 12:56 PM
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#17
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Join Date: Mar 2016
Posts: 8,968
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Yeah, it's internal pipe size. The OD of a half inch pipe is bigger than three quarters.
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01-20-2018, 01:40 PM
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#18
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gone traveling
Join Date: Oct 2016
Posts: 255
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Quote:
Originally Posted by Happyras
I am more afraid with him doing gas piping not knowing pipe sizing or thread style. If he uses a flare adaptor thinking its a pipe thread, it will leak. Yikes!
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+1, with all due respect!
Are you using pipe dope? Is it dope or tape specifically approved for gas?
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01-20-2018, 01:44 PM
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#19
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Give me a museum and I'll fill it. (Picasso) Give me a forum ...
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Location: South Texas~29N/98W Just West of Woman Hollering Creek
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This thread indicates why plumbers have secure jobs.
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01-20-2018, 01:54 PM
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#20
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Administrator
Join Date: Jan 2008
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A thread about threading threads?
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