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Threading question

Posted: Fri Nov 06, 2009 4:01 pm
by Demon
I just have little question here;

Can i get a 3 inches long, 1/2 plumbing pipe threaded female at one end and male at the other one?

My rona has a threading machine but i dont know if they can do this.

Thanks for answers.

Posted: Fri Nov 06, 2009 4:04 pm
by c11man
they dont make them but just put a coupler on the one end to get to female threads

Posted: Fri Nov 06, 2009 4:09 pm
by Hubb
If it is to be done in this manner, you will have to flare the female end so that it will mate with a male end. As c11man said, just get a female adapter. It would probably be cheaper than paying someone to thread the interior of the pipe anyway.

Posted: Fri Nov 06, 2009 4:14 pm
by c11man
i tap the inside of 1/4inch pipe to 1/8inch for some projects but it is almost the exact size for that and i use my own pipe tap for it

Posted: Fri Nov 06, 2009 6:43 pm
by Demon
Yeah... but it needs to be short. i will have to find another way.

Thanks tough.

Posted: Sat Nov 07, 2009 7:42 am
by metalmeltr
Use a close nipple and a female to female coupler. The close nipple is the shortest available. It is threaded to where the threads are right up against each other back to back.

Posted: Sat Nov 07, 2009 10:07 am
by c11man
i came across this on a site when i was looking for some brass fittings
http://www.plumbingsupply.com/brass.html

scroll all the way to the bottom of the page

Posted: Sat Nov 07, 2009 1:39 pm
by D_Hall
Demon wrote:Yeah... but it needs to be short. i will have to find another way.
You said it needed to be 3" long. That should be PLENTY of space to do the ol' "pipe nipple into pipe coupler" stunt.

Posted: Sun Nov 08, 2009 10:02 am
by Demon
I have a little new question here;

Can i thread a metal rod(that is the exact size of the real plumbing pipe) to like 3/4" but all the way on 3 inches ?

Without that cone shaped thread that makes fitings stuck together?

With a threading machine.

Please tell me if you know.

Posted: Sun Nov 08, 2009 10:51 am
by D_Hall
Huh?

I've read that 3 times now and I still have no idea what you're trying to do.

Posted: Sun Nov 08, 2009 5:52 pm
by Demon
It would be making a threaded tit of 3/4 inch, but with a steal rod(i mean a plumbing pipe but not hollow), so i would be getting a tit, like a plumbing pipe one would, but not hollow, it would be full of steel.

Little paint here;


(i need that to then, after drill holes of right size in it)



Can it be made(with a threading machine) ?

Posted: Sun Nov 08, 2009 6:13 pm
by POLAND_SPUD
if you're asking if it's possible to thread a rod then the answer is yes

'cone shaped' threads are called tappered threads

Posted: Mon Nov 09, 2009 9:34 am
by Demon
if you're asking if it's possible to thread a rod then the answer is yes
Yea, but with npt threads, but not tappered...

Not shure if it can be done.

Posted: Mon Nov 09, 2009 10:18 am
by POLAND_SPUD
NPT is tapered (also notice the spelling I made a typo in my last post)
http://en.wikipedia.org/wiki/National_pipe_thread

so it's best if you use BSPP
http://en.wikipedia.org/wiki/British_st ... ipe_thread

but you might as well use NPT... you might experience some problems with sealing it if you thread it all the way but it should mate

Posted: Mon Nov 09, 2009 11:06 am
by dewey-1
Here is a good explanation and charts to show the thread differences for:
NPT, NPS, BSPT BSPP

http://pipeandhose.com/?q=node/19