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compression fitting threads?

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compression fitting threads?

Unread postAuthor: mopherman » Sat Aug 04, 2007 7:28 pm

does anybody know if the threads on compression fittings fit in normal npt threaded fittings? sorry if i phrased that kind of weird. thanks
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Unread postAuthor: hi » Sat Aug 04, 2007 9:25 pm

no they dont, ive tryed.
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Unread postAuthor: Hotwired » Sat Aug 04, 2007 9:27 pm

I know that 15mm compression fittings have practically identical threads to 1/2" BSP, just a bit shorter than normal.
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Unread postAuthor: mopherman » Sat Aug 04, 2007 10:14 pm

hi wrote:no they dont, ive tryed.

oh. bummer. would have looked great to.
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Unread postAuthor: SpudBlaster15 » Sun Aug 05, 2007 12:03 am

They do. I am using a 1/2" compression fitting to hold a rubber schrader valve against a 1/2" steel pipe nipple on my hybrid cannon.
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Unread postAuthor: Hawkeye » Sun Aug 05, 2007 6:58 am

Did you force fit it? They really aren't designed to thread onto other types of Thread. I certainly wouldn't just blindly buy them and expect them to fit.
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Unread postAuthor: mark.f » Sun Aug 05, 2007 7:07 am

The 1/4" ones fit into the threaded outlet left when you remove the torch stem from a Bernzomatic head.

The 3/8" ones ALMOST thread into the neck of a 20 oz. CO<sub>2</sub> bottle.
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Unread postAuthor: jrrdw » Sun Aug 05, 2007 7:21 am

Guys, guys, GUYS! It depends on thread count per inch/mm and the pitch.
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Unread postAuthor: joannaardway » Sun Aug 05, 2007 7:39 am

Hotwired wrote:I know that 15mm compression fittings have practically identical threads to 1/2" BSP, just a bit shorter than normal.

I love this equivalence - so many uses. Just add a little more PTFE tape, and it's all fine.

For others, examples of this one can be seen here (Ragnarok's work where a 28mm-15mm reducer leads into the cylinder port of a 1/2" QEV, and a 15mm tee is leads from the exhaust), and here (Jim/LucyintheSky's work, where a 15mm elbow leads into the 1/2" QEV's chamber port).

I assume that's what you want to do?

If you can get your hands on a thread gauge and set of Vernier calipers, then you should be able to measure the threads of different things to compare them.
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Unread postAuthor: mopherman » Sun Aug 05, 2007 11:02 am

yeah, well if the threads dont end up working, do you guys have any idea to get a 1/2 copper barrel into a threaded tee coaxialy ?
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Unread postAuthor: SpudBlaster15 » Sun Aug 05, 2007 12:21 pm

Hawkeye wrote:Did you force fit it? They really aren't designed to thread onto other types of Thread. I certainly wouldn't just blindly buy them and expect them to fit.


No, it has 1/2" NPT threads, and threaded directly onto a 1/2" pipe nipple.
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Unread postAuthor: Hawkeye » Sun Aug 05, 2007 1:57 pm

A compression fitting doesn't have NPT though....
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Unread postAuthor: SpudBlaster15 » Sun Aug 05, 2007 2:20 pm

I will go take a picture in a few minutes to prove you wrong.
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Unread postAuthor: frankrede » Sun Aug 05, 2007 3:52 pm

I have tried using compression female fittings on a length of iron pipe and the threads were not similar.
But speaking of co2 and 3/8" threads, a co2 bottle threads are close to 3/8 npt but not the same, so I just tapped some 3/8" ones in with ease.
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Unread postAuthor: noname » Sun Aug 05, 2007 11:10 pm

Hawkeye, SpudBlaster said that the compression fitting was threaded onto a pipe nipple. This leads us to believe that it was a female compression fitting, which have female NPT threads on them.
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