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Thread: Threading CZ550 5/8 UNEF?

  1. #1

    Threading CZ550 5/8 UNEF?

    Morning all

    I have decided to put a mod on my CZ550 6.5x55 stalking rifle, it has a sporter barrel so there is not a huge amount of meat at the muzzle. I've been offered a S/H ASE mod that is 5/8 UNEF but my RFD thinks hat this ay not leave enough shoulder to seat the mod properly.

    Does this sound right ? Does anyone have any idea of what the minimum barrel diameter barrel for this thread would be?

    Cheers

  2. #2
    You should have a shoulder which is larger than the root diameter of the female thread in use.
    You will probably find you only have room for an M14 thread, and even that may be tight, in which case I would go for M14x1 with a spigot.

    Neil.

  3. #3
    Quote Originally Posted by Hornet 6 View Post
    You should have a shoulder which is larger than the root diameter of the female thread in use.
    You will probably find you only have room for an M14 thread, and even that may be tight, in which case I would go for M14x1 with a spigot.

    Neil.
    Ok, well he has a 14x1 30 cal mod at same price so not too end of the world. Excuse my ignorance but is the root diameter the outside diameter of the female thread, the bit where the sharp edge of the male thread meets?

  4. #4
    I cut 5/8 x 18 the other day, the barrel was turned to 0.625, which I'm guessing isn't much less than your Sporter barrel, so 14x1 would work giving you enough shoulder with relief cut before the thread.

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