Thread Pitch - Anyone know????

[Missing Something]

Does anyone know the proper thread pitch for the CZ-858 rifle muzzle break?

I am also looking for the thread pitch for the Canadian C6 flash hider. (Mag 58)

Any help would be greatly appreciated.

Information

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[Missing Something]

OK... CZ858 and VZ 58's are M14x1 RH.

Anyone... CF armourers..... MAg 58 thread pitch for flash hider???????

[gunasauras]

I'll check and get back to you all...

[Missing Something]

I'll check and get back to you all...

Thanks gunasauras... here is what I found out...

A buddy contacted FN Herstal-USA (FNH-USA) about the M240 GPMG threads and received this reply today.

M240 Barrel thread pitch is English non-standard. The call out is (25/32) 0.7812-24 UNS-3A Special. So while the pitch is a standard 24 threads per inch, the diameter is non-standard.
I hope this helps!
Bob Ailes
Customer Support Manager
703-288-3500 ext. 122
roberta@fnhusa.com

[ireload2]

The term "Special" may mean that either the major diameter or the root diameter or both have been modified from what you might calculate for a normal 24 TPI thread.

[lisa wilson]

it's difficult to tell as only a professional knows this type of specifications.

but will get back to u wid these soon..

[jmoore]

The obvious answer would be that the major diameter is non-standard, or am I missing something? Just about all non-metric firearms threads are "special", much to our consternation!

[Missing Something]

The obvious answer would be that the major diameter is non-standard, or am I missing something? Just about all non-metric firearms threads are "special", much to our consternation!

Thats correct. Thread is standard 24 TPI but the diameter is 25/32"...

Gotta love that European stuff.... I think they do that just so people dont mess with it

[Mick]

I think it would be simpler to rethread than that worry about a difference.

[Missing Something]

I think it would be simpler to rethread than that worry about a difference.

I needed to make an adapter... it worked...