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Shooting & Reloading - Mausers, Big Bores and others >> Rifles
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Haverluk
.224 member


Reged: 18/01/17
Posts: 2
Loc: Graham, WA
BRNO ZKK barrel threads?
      #326467 - 27/03/19 03:51 AM

Looking to change out some barrels on some BRNO ZKK actions.

Curious of the barrel thread sizes.

The 602 and 550 magnum are M28x2
The 550 standard length is M26x2

What are the thread patterns of the ZKK 601 and 600 (short and standard length actions)?

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Homer
.416 member


Reged: 07/04/09
Posts: 3081
Loc: Canberra, Australia
Re: BRNO ZKK barrel threads? [Re: Haverluk]
      #326609 - 29/03/19 05:17 PM

G'Day Fella's,

Haverluk, according to my records, they are the following;

Brno ZKK 600-601 = 1.020" x 2.00mm Pitch

Brno ZKK 602 = 1.100" x 2.00mm Pitch

So if you divide the Imperial thread diameter (1020" and 1100") x 25.4, you will end up with the Metric diameter.

Hope that helps

D'oh!
Homer

--------------------
"Beware the Lolly Pop of Mediocrity,
Lick it Once and You Will Suck Forever"

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93x64mm
.416 member


Reged: 07/12/11
Posts: 3975
Loc: Nth QLD Australia
Re: BRNO ZKK barrel threads? [Re: Homer]
      #326612 - 29/03/19 06:03 PM

Quote:

G'Day Fella's,

Haverluk, according to my records, they are the following;

Brno ZKK 600-601 = 1.020" x 2.00mm Pitch

Brno ZKK 602 = 1.100" x 2.00mm Pitch

So if you divide the Imperial thread diameter (1020" and 1100") x 25.4, you will end up with the Metric diameter.

Hope that helps

D'oh!
Homer



1.020" = 25.908mm
1.100" = 27.940mm

&

Quote:

Looking to change out some barrels on some BRNO ZKK actions.

Curious of the barrel thread sizes.

The 602 and 550 magnum are M28x2
The 550 standard length is M26x2

What are the thread patterns of the ZKK 601 and 600 (short and standard length actions)?



So from Homer's notes the ZKK 600/601 barrels would then verify your notes against the CZ 550 standard action - had a win Haverluk

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Homer
.416 member


Reged: 07/04/09
Posts: 3081
Loc: Canberra, Australia
Re: BRNO ZKK barrel threads? [Re: 93x64mm]
      #326616 - 29/03/19 07:16 PM

Thanks for working that out for us 93x64, Very Much Appreciated.

Regards
Homer

--------------------
"Beware the Lolly Pop of Mediocrity,
Lick it Once and You Will Suck Forever"

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Haverluk
.224 member


Reged: 18/01/17
Posts: 2
Loc: Graham, WA
Re: BRNO ZKK barrel threads? [Re: Homer]
      #326618 - 30/03/19 03:30 AM

Thanks Gents!

Makes my life a little easier.

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Waidmannsheil
.400 member


Reged: 19/04/13
Posts: 2376
Loc: Melbourne Australia
Re: BRNO ZKK barrel threads? [Re: Haverluk]
      #326623 - 30/03/19 07:48 AM

When cutting a male thread the blank is always made about 0.1mm/0.004" smaller than the nominal size. If the thread is really small than you might only reduce it by 0.002 and if it is a big thread than you might make it 0.008". This is to allow for wear on the tips of the thread cutting tool and makes sure that there is clearance between the crest of the male thread and the root of the female thread. The same process is also used when boring out the hole in preparation for the female thread although to a lesser degree. A properly fitted thread locates on the flanks and not on the ID/OD. Hence why your Nominal thread of M28 actually measures 27.94mm.

If you are using a tap and die as opposed to cutting the thread with a single point cutter such as in a lather or mill, then depending on the material and the thread pitch you may have to increase the clearance to stop the thread tearing or spinning the job.

On some tougher materials and/or multiple lots if you want to speed up the process but only need a commercial thread as opposed to a fitted thread you can screw cut to 80% depth and then finish with a tap or die at high speed and feed in one pass.

Hope some of this helps.


Matt.

--------------------
There is nothing wrong with vegetarian food, so long as there is meat with it.

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