Gunsmithing Question about muzzle thread length

[BoilerUP]

Is there an industry standard length of threads for 1/2-28 and 5/8-24 muzzle threading?

I've inquired to couple suppressor manufacturers, and it seems like most muzzle threads for 5.56 and 7.62 cans are 0.60-0.65" in length.

Would be any problems threading a muzzle a bit shorter (say 0.40-0.50") than spec for a given suppressor? Maybe cause issues with the cans, or off-the-shelf muzzle brakes, thread protectors, etc?

Thanks!

 

[LRI]

Re: Question about muzzle thread length

General terms here:

Thread length should be at least equal to thread diameter in order to locate position.

C.

 

[2156SMK]

Re: Question about muzzle thread length

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BoilerUP</div><div class="ubbcode-body">Is there an industry standard length of threads for 1/2-28 and 5/8-24 muzzle threading?</div></div>

In general, most centerfire autoloading "AR type" rifles have 5/8" long threads, give or take 0.025" or so.
That is by-far the most common thread length spec I run into at least.
Now, some muzzle brakes have considerably longer threads inside them.
You don't generally need to cut the barrel threads as long as the inside of the muzzle device though.
Sometimes it is quite desireable to have more room before the blast baffle or the first set of ports for gas to expand more before it hits that first surface.

Rimfire changes the game.
There are many 22 rimfire 1/2-28 threaded suppressors setup for 10mm barrel thread length spec.

 

[mtrmn]

Re: Question about muzzle thread length

thread specs for YHM suppressors

http://yhm.net/index.php?main_page=page&id=8

 

[x ring accuracy]

Re: Question about muzzle thread length

Safest answer is make them square. 1/2 = .50 long, 5/8 = .625 . I am sure I will get my ass ripped for this but if a customer comes into my shop. Wants a barrel threaded but has no idea the length, square at minimum.