Thread Pitch - Anyone know????

**Missing Something** · 06-21-2007 07:46 PM

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 icon

C6 flash hider. (Mag 58)

Any help would be greatly appreciated.

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**Missing Something** · 06-25-2007 06:54 PM

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

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

**gunasauras** · 07-25-2007 08:44 PM

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

**Missing Something** · 07-25-2007 11:05 PM

Originally Posted by gunasauras

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** · 06-17-2009 10:37 PM

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** · 07-24-2009 05:02 AM

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

but will get back to u wid these soon..

**jmoore** · 07-24-2009 05:49 AM

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** · 07-24-2009 12:23 PM

Originally Posted by 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!

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** · 07-24-2009 02:53 PM

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

**Missing Something** · 07-24-2009 03:51 PM

Originally Posted by Mick

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

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

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