What caliber muzzle brake??
Muzzle brake threads are pretty industry standard now by caliber.
That prevents Billy Bubba from screwing a .223 muzzle device on a .308 rifle barrel, and clamping it on with set screws...
But in general, fine threads are used to get more thread purchase.
1/2"-28, 9/16"-24, and 5/8"-24 is industry standard, depending on caliber.
My best advice is to either do it right.
Or don't do it at all.
rc