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What pipe slips OVER Standard 1in-14 thread. (male)?

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What pipe slips OVER Standard 1in-14 thread. (male)?

Old 01-19-2019, 05:23 AM
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Question What pipe slips OVER Standard 1in-14 thread. (male)?

I need to slide aluminum pipe over a standard 1"-14 thread (male) pipe. It is actually a marine VHF antenna mount that is the standard 1"-14 thread.(male)... I am looking for aluminum. I currently do not have the actual mount so I can't put my caliper on it - but I'm trying to get an idea of what I need.

I believe the Schedule 40 1" will give me the tightest possible fit, but I'm not certain. I am not looking to thread the pipe - I'm looking to slip it over the 1"-14.

Does 40-1" look right?

Thanks,
Pete

Old 01-19-2019, 05:42 AM
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There is a 1" x 8 UNC, a 1" x 12 UNF, a 1" pipe thread that is 11-1/2 Threads per inch.

I have never heard of a 1 x 14 thread before. There are lots and lots of weird threads that are specific to a particular industry that nobody else ever uses. What is this thing?
Old 01-19-2019, 05:42 AM
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Tough answer. Somewhere (size) they switch from OD to ID it seems. After 50 years I still don't know pipe sizes.
Old 01-19-2019, 05:47 AM
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Google nominal pipe sizes and you'll find charts of all the standard pipe schedules. But you'll need to know the OD of our thread first. Pipe is measured by ID - although it's really some size that's close to the given ID. Tubing is measured by OD and is true to size.
Old 01-19-2019, 05:50 AM
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Originally Posted by maintenanceguy View Post
There is a 1" x 8 UNC, a 1" x 12 UNF, a 1" pipe thread that is 11-1/2 Threads per inch.

I have never heard of a 1 x 14 thread before. There are lots and lots of weird threads that are specific to a particular industry that nobody else ever uses. What is this thing?
It is a VHF male threaded end.

It is actually this:




...and what we are looking to do is find aluminum schedule 40 (or 80, if it can happen) that will slide over that threaded fitting (the pipe will NOT be threaded).
Old 01-19-2019, 05:52 AM
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1" sch40 is 1.315od x .133" wall , 1.049 id
Old 01-19-2019, 05:54 AM
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Originally Posted by Flatland fisher View Post
1" sch40 is 1.315od x .133" wall , 1.049 id
You have the spec for what that threaded 1"-14 thread is? I can't find drawings for any VHF male or female thread... and I don't have one to put my caliper on...
Old 01-19-2019, 06:08 AM
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Standard 3/4" NPT (National Pipe Thread) is 14 threads per inch and would be about 1" outside diameter, pipe is measured by the inside diameter.
Old 01-19-2019, 06:14 AM
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You can also spend a few minutes here:

https://www.mcmaster.com/standard-pipe-fittings

I had to get some odd SS pipe to extend some rubber playground ball mounts last year and McMaster was a big help.
Old 01-19-2019, 06:17 AM
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Looks like your pic is NPT rolled cut
Old 01-19-2019, 06:28 AM
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I just measured an antenna mount at 0.964 and it's really lose in a 1" piece of pipe.
Old 01-19-2019, 06:40 AM
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Originally Posted by OldPete View Post
You have the spec for what that threaded 1"-14 thread is? I can't find drawings for any VHF male or female thread... and I don't have one to put my caliper on...
Sorry, I do not have that information right now. I don't deal with fittings much, just sell lots of structural and sheet product.
Old 01-19-2019, 06:52 AM
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Originally Posted by mfix View Post
I just measured an antenna mount at 0.964 and it's really lose in a 1" piece of pipe.
Ah! Ok. So you measured a male threaded VHF mount and you get .964" OD, correct?
Old 01-19-2019, 06:54 AM
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maybe do a little reaming on the inside of a 1" pipe. use a flapper wheel on a drill motor if you don't have a rotary tool.
Old 01-19-2019, 07:02 AM
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Originally Posted by OldPete View Post
Ah! Ok. So you measured a male threaded VHF mount and you get .964" OD, correct?
That's correct.
Old 01-19-2019, 07:19 AM
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A 3/4" NPT coupling screwed on to the mount.
Old 01-19-2019, 01:15 PM
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Terrific info guys. Thank you!
Old 01-19-2019, 02:11 PM
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Originally Posted by billinstuart View Post
Tough answer. Somewhere (size) they switch from OD to ID it seems. After 50 years I still don't know pipe sizes.
12" and down measured by the ID, sched 40 pipe.
14" and up is measure by the OD.
Old 01-21-2019, 06:06 AM
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1" NOM. (1.32" OD X 0.18" WALL X 0.957" ID) ALUMINUM 6061-T6 PIPE SCHEDULE 80

Ok... I'm still waiting on the actual part so I can put eyeballs on the OD, but if mfix is spot-on, it would appear that with almost zero hassle some 1" schedule 80 will slip over and provide a nice bite.

The fitting is: .964
The ID of the pipe is .957

.0007 of an inch, I'd have to think that's a non-issue.

Thanks again for the help on this one.

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