Is there an industry convention for threads?

mbogo · Post by **mbogo** » Mon Jul 03, 2017 4:08 pm

I want to thread a barrel for a muzzle device, and while looking for the die, I see several types of threads:

- UNEF
- UNF
- UNC
- UNS
- NPT

I'd think UNEF would be preferable to allow a tighter seal.

mbogo

doubloon · Post by **doubloon** » Mon Jul 03, 2017 9:52 pm

There's the AAC guide http://www.silencertalk.com/AAC-thread-guide.pdf

jreinke · Post by **jreinke** » Tue Jul 04, 2017 8:24 am

Here's the link to Silencerco's specs: https://silencerco.com/product-support/#tab-4

Some where I've got Sig specs too, I'll see if I can find them.

ETA - Sig: http://www.ar15.com/forums/t_6_20/47879 ... rakes.html

doubloon · Post by **doubloon** » Tue Jul 04, 2017 9:23 am

Yay!

8% of the "standards" finally in one thread

mbogo · Post by **mbogo** » Tue Jul 04, 2017 11:49 am

UNEF for both of those

mbogo

jreinke · Post by **jreinke** » Wed Jul 05, 2017 7:16 am

mbogo wrote:I want to thread a barrel for a muzzle device, and while looking for the die, I see several types of threads:

- UNEF
- UNF
- UNC
- UNS
- NPT

I'd think UNEF would be preferable to allow a tighter seal.

mbogo

BTW all of these thread specs assume that you cut the threads on a lathe. Cutting barrel threads with a die is a recipe for disaster. There's virtually no chance that you could get the die to cut concentric or parallel to the bore or to get the correct thread pitch measurement.

mbogo · Post by **mbogo** » Wed Jul 05, 2017 9:24 am

jreinke wrote:BTW all of these thread specs assume that you cut the threads on a lathe. Cutting barrel threads with a die is a recipe for disaster. There's virtually no chance that you could get the die to cut concentric or parallel to the bore or to get the correct thread pitch measurement.

Even with one of those thread alignment tools?

mbogo

fishman · Post by **fishman** » Wed Jul 05, 2017 1:28 pm

jreinke wrote:
mbogo wrote:I want to thread a barrel for a muzzle device, and while looking for the die, I see several types of threads:

- UNEF
- UNF
- UNC
- UNS
- NPT

I'd think UNEF would be preferable to allow a tighter seal.

mbogo
BTW all of these thread specs assume that you cut the threads on a lathe. Cutting barrel threads with a die is a recipe for disaster. There's virtually no chance that you could get the die to cut concentric or parallel to the bore or to get the correct thread pitch measurement.

As long as the shoulder is cut on a lathe you should be fine. The shoulder is what squares the silencer not the threads( or the muzzle on .578 45acp threads)

mbogo · Post by **mbogo** » Wed Jul 05, 2017 1:37 pm

Thanks! I think I'll stick to sending my barrels off for threading. There are no capable gunsmiths here in Vegas or its immediate environs.

mbogo

Is there an industry convention for threads?

Is there an industry convention for threads?

Re: Is there an industry convention for threads?

Re: Is there an industry convention for threads?

Re: Is there an industry convention for threads?

Re: Is there an industry convention for threads?

Re: Is there an industry convention for threads?

Re: Is there an industry convention for threads?

Re: Is there an industry convention for threads?

Re: Is there an industry convention for threads?