Posted this question on the gunsmith board and can't get an answer......maybe someone here knows?

What other Mauser actions (military included) would a CZ 550 Safari rifle take-off barrel fit? I found a barrel threaded for a 550 and want to use it on another action if the threads will work???? (don't have an action yet)

[ 01-13-2003, 04:20: Message edited by: GonHuntin ]

Mauser 98 threads are 1.100x12tpi. Except the Peruvian & Turk 1904

Doug
Maybe I'm just dense......but that doesn't tell me what size the 550 threads are?

Kevin Jenkins tells me that the CZ 550 Magnum and the BRNO(CZ) ZKK 602 have the same metric threads that are not quite the same as an M98 Mauser, but very close.

The threads have a 2 millimeter pitch. This is 25.4 mm/2mm >>> 12.7 tpi

The threads measure 1.092" on a BRNO(CZ) take-off barrel I just measured, and this equates to the 1.100" nominal thread of a Mauser 98.

Whatever the metric designation for these threads is, I do not know, but the CZ 550 is close to a 1.100" x 12.7 tpi thread.

The correct metric designation for the CZ threads?

27.9mm (O.D.) x 2mm (thread pitch) = 1.100 x 12.7 tpi? = 1.10"-12.7 tpi (UN)?

Here are some actions that it won't work on:

Pre-64 M70 = 1.00"-16 tpi
Rem. M700 = 1.06-16
Wby Mark V = 1.06-16
Win. M70 1968 version = 1.0"-16 tpi
BBK-02 = 1.10-12
Ruger M77 Mk I and Mk II = 1.000"-16 tpi (UN)
M98 = 1.10-12 (UN)?
CZ 550 = 1.10-12.7 (UN)?

I do not think that a CZ barrel will work on a standard Mauser, unless the Mauser is actually 12.7 tpi and a 2mm thread pitch.

Now where are the experts on barrel threads?

Sum buddy who know?

Gone Hunting,
what barrel did you find? If it's a 458, you MIGHT can squeeze it into a mexmauser (smallring 98) as a 458.. or certainly as a 458x2/450 marlin.. which I am going to do this spring.
jeffe

DaggaRon is almost exactly right. The CZ 550 major diameter is 1.095 X 2mm threads. These are metric threads and it's a waste of time trying to equate this to tpi. The closest tpi is 13. Fundamentally, only a Bruno602 action uses the same threads and I believe shank dimensions as the CZ550. If memory serves me, the old Brevex Mauser actions used a 2 MM thread, but the major diameter was 1.114 or something like that( a little larger than the CZ). A CZ barrel would be too loose on a Brevex assuming you could find one anyway. The only thing you could possibly do is turn off the threads to produce a shank with the major diameter of a small ring Mauser( .980X12 tpi) and rethread the barrel for a Turkish Mauser action. This may not be a bad way to go. I've made a few RemTurks and they work quite well. Good luck with timing the barrel band and sights!-Rob

[ 01-13-2003, 07:09: Message edited by: Robgunbuilder ]

Rob,
Thanks, that makes sense to me. I just wonder if the Czechs mix inches and millimeters in their thread nomenclature?

Or how about the Germans, Scandinavians, other Europeans? How do they describe their barrel threads?

Any Euro-gunsmiths or gun nuts out there?

Maybe Walter could answer this one?

Thanks for the help so far.....but I think I need to back up just a bit......the barrel is new and has been threaded for a CZ 550, but, it hasn't been chambered.....it is a 458 1 in 18" twist, number 6 contour. I mentioned the "cz takeoff" because I thought it would be less involved than explaining the whole situation.....I was thinking about the "jungle carbine" thread from awhile back and thought that this might be a good barrel for that type of project....an inexpensive Mauser action.....an inexpensive barrel......well, you get the idea.

So, would this barrel be of any use for this type of project?

Thanks, Mark

The Turkish Mauser is as cheap as they come right now. About $50. at Big Five for a complete rifle. I'd turn off the CZ threads down to .980 and shorten the shank for a Small ring Mauser ( .645). Build yourself a 458 Win Mag. Use about 20 inches of barrel and a cheap synthetic or wood stock. I built just such a rifle a year ago using a Remington take off barrel and could not be more pleased with it. Just the thing to take to Africa as a backup rifle and just leave there as a present!
DaggaRon- Machineries Handbook has just about everything you ever want to know about threads in it. If it's not covered there, it probably isn't important!-Rob

[ 01-13-2003, 08:49: Message edited by: Robgunbuilder ]