Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Posted: 1/13/2006 6:58:32 PM EDT
I want to thread my barrel to 1/2x20mm. Is that possible to go from 1/2x28mm to 1/2x20mm using the same barrel? I want to put on a home made flash-hider that is tap thread at 1/2x20.
Link Posted: 1/13/2006 8:47:04 PM EDT
I think you're confused on the thread designations. The standard AR thread is 1/2"-28 TPI (threads per inch). If your FH is 1/2"-20 TPI there is no way you are going to modify the existing threads to make it work. Not without butchering the threads. You would need an adapter, which would look rather clumsy, or the barrel would have to be cut shorter and rethreaded.
Link Posted: 1/13/2006 9:10:46 PM EDT
ive done some minor re threading and it works on some stuff. Just wasnt sure if I should do it on my barrel.
Link Posted: 1/13/2006 11:20:11 PM EDT
you could.


more trouble than its worth imo unless you are going to cut it down and then thread it.
Link Posted: 1/14/2006 4:47:25 AM EDT
[Last Edit: 1/14/2006 4:48:16 AM EDT by demusn1979]
You cannot rethread existing threads with a different pitch,that would be cross threading.
Link Posted: 1/14/2006 10:35:43 AM EDT
I will have to cut it and then thread it like he said. thanks guys
Link Posted: 1/14/2006 10:42:59 AM EDT
Wouldn't it be better to make another flash suppressor with the correct threads than have a barrel with oddball threads?
Link Posted: 1/14/2006 11:53:11 AM EDT

Originally Posted By M4Madness:
Wouldn't it be better to make another flash suppressor with the correct threads than have a barrel with oddball threads?




+1
Link Posted: 1/14/2006 1:56:52 PM EDT
If you dont want to make another FH you can bore out the 1/2-20 threads (if you have enough wall thickness) and silver solder in place a threaded bushing with the proper 1/2-28 threads... just an idea. PATRIOT ARMORY 07 FFL
Link Posted: 1/14/2006 11:08:19 PM EDT
Link Posted: 1/15/2006 6:53:08 AM EDT
You could buy an adaptor. 1/2 x 28 tpi to 1/2 x 20 tpi. Just a thought.......
Link Posted: 1/15/2006 11:27:08 AM EDT
Just a thought, but could you JB weld the threads smooth and then try to rethread it?
Link Posted: 1/15/2006 9:31:34 PM EDT

Originally Posted By kc8ard:
Just a thought, but could you JB weld the threads smooth and then try to rethread it?



It is better to leave this type of machining to professionals. Some of these ideas are just crazy. On the other hand when you screw it up, we professionals get to charge more money.
Link Posted: 1/15/2006 9:44:01 PM EDT
Don't listen to these guys. It'll fit.

You just need to start it, and get a big, really big pipe wrench and maybe a breaker bar. Be sure to clamp the barrel in a vice good and tight. The tighter the better. Put some pressure on it. It won't be flying off after a few shots either. No need to change the thread, it'll adapt to the new ones pretty easy....

These guys just want you to spend money you don't have to.

Adaptors and thread pitch. Bull puckey I say. They didn't make muskets like that back in the day....
Link Posted: 1/16/2006 6:32:36 AM EDT
[Last Edit: 1/16/2006 6:33:43 AM EDT by Bandit68]

Originally Posted By rtech:
Don't listen to these guys. It'll fit.

You just need to start it, and get a big, really big pipe wrench and maybe a breaker bar. Be sure to clamp the barrel in a vice good and tight. The tighter the better. Put some pressure on it. It won't be flying off after a few shots either. No need to change the thread, it'll adapt to the new ones pretty easy....

These guys just want you to spend money you don't have to.

Adaptors and thread pitch. Bull puckey I say. They didn't make muskets like that back in the day....





Oh and
Link Posted: 1/16/2006 8:03:30 PM EDT

Originally Posted By Bandit68:

Originally Posted By rtech:
Don't listen to these guys. It'll fit.

You just need to start it, and get a big, really big pipe wrench and maybe a breaker bar. Be sure to clamp the barrel in a vice good and tight. The tighter the better. Put some pressure on it. It won't be flying off after a few shots either. No need to change the thread, it'll adapt to the new ones pretty easy....

These guys just want you to spend money you don't have to.

Adaptors and thread pitch. Bull puckey I say. They didn't make muskets like that back in the day....





Oh and



Humor is way beyond you I see. Don't worry, there are plenty of people who don't understand funny things. You are not alone.
Top Top