Where to get a .578-28 threaded flash suppressor?


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FourTeeFive
August 15, 2008, 06:10 PM
Anyone have any ideas?

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a-sheepdog
August 29, 2008, 11:42 PM
You might check some of the suppressor manufacturers. I would think that a machinist could take a standard flash hider and recut the threads. You might check Brownells.com and see if any of their Smith Enterprise flash hiders are threaded to that pitch. Shot in the dark but all that I could think of.

FourTeeFive
August 30, 2008, 01:36 AM
Thanks. I've been in touch with a few flash hider guys and they might do it, but they don't own the taps for that thread. We'll see how far I get.

rcmodel
August 30, 2008, 10:57 AM
What in the world is this for?

I don't think that is a standard thread anywhere in the world, so there aren't going to be any taps for it.

Might be much simpler to just have the barrel re-threaded to fit a standard flash hider thread.

rcmodel

FourTeeFive
August 30, 2008, 03:22 PM
What in the world is this for?

I don't think that is a standard thread anywhere in the world, so there aren't going to be any taps for it.

It's a standard .45ACP suppressor thread. Sig uses it, among others. Most aftermarket threaded barrels for Glocks in larger calibers are available with this thread as well.

I had a .45ACP carbine barrel threaded for it and would like something other than a thread protector.

kingjoey
August 31, 2008, 02:23 PM
We do a lot of flash hiders and brakes, but nothing for the standard .45 ACP stuff. Check with SEI, I believe they make a Vortex FH in .578

Sunray
August 31, 2008, 09:58 PM
.578-28 isn't a standard tap or die size. The only 28 TPI count is #12 or 1/4". 1/2" taps come in 13 and 20 TPI.
It may be metric. The .578 converts to 14.68mm, but the 28 TPI still doesn't apply. The TPI will be Threads Per MM. 14 mm taps come in 1, 1.25 and 1.5 TPMM.

highorder
August 31, 2008, 10:14 PM
I believe you are looking for a nominal 9/16-28 UNS (unified national special, finer than UNF)

Ext. 9/16-28 UN 2A 0.0011 0.5614 0.5549 - 0.5382 0.5345 0.5188

http://www.efunda.com/DesignStandards/screws/unified.cfm?start=64&finish=147

It's a standard .45ACP suppressor thread.

Correct.

FourTeeFive
August 31, 2008, 11:01 PM
I certainly did pull the number out of thin air. Check out Bar-Sto, EFK, FTF, and others and they all list this thread.

I was told the closest tap would be 37/64-28.

highorder
September 1, 2008, 12:12 AM
In theory; but I have never seen a tap that size. It would fall outside of the UN series, but could be made custom.

Gemtech uses the .578-28tpi as well as the M16x1 or M16x1-LH.

FourTeeFive
September 1, 2008, 01:38 AM
One guy I talked to found a 37/64-28 tap for $95.

I wonder if the suppressor manufacturers are using taps or special machining tools to provide the inner threads.

highorder
September 1, 2008, 01:55 AM
I would hope that suppressor manufacturers are single-point CNC turning threads for concentricity's sake.

Any reason not to install a can instead of a flash suppressor?

kingjoey
September 1, 2008, 03:05 AM
.578x28 is an SAE thread, but it isn't a standard 16ths type. It is approximately a 37/64", but it is a size pretty much unique to threading 45cal firearms. We thread barrels for it on centers with the lathe using a single point cutter, the female thread on the attachment can be done the same way.

kingjoey
September 1, 2008, 03:06 AM
I would hope that suppressor manufacturers are single-point CNC turning threads for concentricity's sake.

+1, its the only way to ensure good concentricity and alignment.

FourTeeFive
September 1, 2008, 12:14 PM
Any reason not to install a can instead of a flash suppressor?

In Washington state where I live I can own a suppressor but can't use it.

Ok, stop laughing... it's the law.

:banghead:

toolman6061dude
February 14, 2009, 05:43 PM
If you are looking for a .578-28 tap you can go to. http://stores.ebay.com/Stoners-Tools-and-Raw-Materials
They have them in stock.

FourTeeFive
March 4, 2009, 12:43 AM
Thanks Toolman!

Viper5243
March 15, 2009, 07:10 AM
Not to steal the thread but i bought a .45 AR15 upper and it had a vortex like muzzle break/flash hider on the end. Went to remove it and ended up splitting it right down the middle. We found a new muzzle break but it wouldn't fit. Turns out the threading is left hand. now where can i find a left hand threaded muzzle break or flash hider. I have e-mailed a couple companies so far but haven't heard back anything yet

woodsoup
March 22, 2009, 12:01 PM
Have you contacter the upper manufacturer, or the barrel manufacturer?

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