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List of ZTs that Don't Have Lock Failure Issues

Discussion in 'General Knife Discussion' started by Horizon7, Nov 2, 2018.

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  1. Horizon7


    Jun 16, 2018
    Since the list of Zero Tolerance models having lock failure issues is so long, it may be easier to list the models that have NOT had issues.

    After reading several threads, I haven't seen reports of the Les George or Ken Onion collabs being affected. I also heard the 0470 is good to go.

    Any others?
    NG VI likes this.
  2. unwisefool

    unwisefool Gold Member Gold Member

    Jan 22, 2007
    None of mine have it, if that helps.
    bad_juju, brancron and 115Italian like this.
  3. SpySmasher

    SpySmasher Lead Guitar Platinum Member

    Sep 1, 2016
    The heavily modified ZT 0055 that I carry quite a bit.

    I call her "Gus."

    I can't account for the other 9 bajillion ZT 0055s out there though so you might want to hold off adding Gus to your list.
  4. Gideons


    Dec 9, 2015
    Here a list of models I haven't had this issue with...
    4 x ZT 0301, 3 X ZT 0560BW, ZT 0566BW x6, ZT 0350TS x4, 2x ZT 0350BW, 1 x ZT 0450, 1x ZT 0450CF, 2x ZT 0562BLK, 1x ZT 0630.
    Knives I had issues with...
    1x ZT 0620, 1x ZT 0630ORBLK.

    Frankly, this issue in my opinion is way overblown.
  5. Horizon7


    Jun 16, 2018
  6. Tommy-Chi


    May 25, 2017
    The failure seems to be on several ZT models, as well as several other brands models. It's just a fact that you have to acknowledge and treat every folder with a little bit of suspicion. Some types of locks are NOT prone to failure. There are good and bad locks. I do not have an extensive list of good lock types but that would be a better question if you are looking for a very good lock.

    What I would do for every new folder from every manufacturer is to check the lockup visually when you get the knife. Then with the knife in a gloved hand, YOU MIGHT want to lightly press down (1lb to 2lbs of pressure max) on the back of the blade with the other hand. If it passes this it is probably never going to fail you in normal duty.

    Don't bother spine whacking the knife because that would probably not be a normal function for any folder to pass. You can test a knife any way that you want, but spine whacking does not prove the integrity of a lock.

    If you buy a new folder that has a lock that fails return it to the manufacturer explaining what happened and ask them to fix it.

    I have quite a few folders and one ZT lock did fail(Zero Tolerance Factory Custom 0450FCZDP), but they fixed it. I'm still buying folders, but I'm looking for fixed blades that I can EDC and leave most of the folders at home. Again, you need to do your due diligence (testing) when you get a new folder. This should be part of your experience in carrying a folder.
    Bryan J Ball and Horizon7 like this.
  7. Boozoo Chavis

    Boozoo Chavis

    Oct 18, 2003
    I've had zero problems with the 0900, 0609, 0450, 0452, 0460, 0462, 0470
    RBid and Horizon7 like this.
  8. Stumpy72

    Stumpy72 Basic Member Basic Member

    Jul 5, 2018
    Never any problems with my 0450 or 0452.
    Horizon7 likes this.
  9. AF

    AF Gold Member Gold Member

    Jan 14, 2000
    I don't think most people test them. Personally I never spine whack although I don't see anything wrong with doing so against the palm of the hand. I do always test for blade play including lock rock. I also note how much a liner or frame lock moves over when cutting forcefully. But I never manually push over the lock.
    My first gen 0801 had a lock that would move all the way over when cutting forcefully. It would jam and be difficult to disengage.
    Since then I've owned a 0562, 0630, 0301, 0450 and 0462. I didn't detect any lock issues.
    I'm interested in the 0470.
    Lapedog and Horizon7 like this.
  10. scottyj


    Jan 29, 2009
    My 0909 will close if tapped lightly on the spine.
    NG VI, Lapedog, taste.blade and 3 others like this.
  11. Horizon7


    Jun 16, 2018
    Well, there goes my Les George theory
    NG VI likes this.
  12. jill jackson

    jill jackson

    Sep 5, 2006
    My 0909 fails light taps. The rest I own seem fine although I don't like to beat them hard as some do.
    NG VI, Lapedog, Gideons and 1 other person like this.
  13. unwisefool

    unwisefool Gold Member Gold Member

    Jan 22, 2007
    My 620 locks up like a vault
  14. Mo2


    Apr 8, 2016
    I wouldn't say it's model specific but a qc issue. They have issues with lock geometry on random knives. The guy who tested this had all 7 of his knives fail. And there have been failures many years ago too. So technically it could happen to any of them. Though I suspect some models won't have the issue at all, it's too hard to tell.
    NG VI likes this.
  15. Schwifty

    Schwifty Basic Member Basic Member

    Nov 26, 2015
    It’s random, I read all about 450’s failing and mine was fine, same with my 561. But that is a gen 1 with no lock bar insert so there you go.
  16. Tommy-Chi


    May 25, 2017
    I have an 0900, 0452 CF, 0609BLK, 0450FCZDP, (TWO) 0095TANBLK. I like my 0095TANBLKs the best, really solid knives. All of my ZT knives work as designed right now.
    Old Man of the Desert likes this.
  17. tony281sc2


    Feb 13, 2017
    I hardly ever beat the hell out of my $200+ knives but my 0462blk and my 0562 seem to lock up very early (<25%). Those are the only ones I can think of that lock up extremely early and might fail a spine-whack-abuse test but I’m not gonna hammer on my ZT for no reason. If I’m cutting something the pressure is going the other way, and my finger is under the flipper tab which means it ain’t gonna close anyway. I don’t get why people care about that dumb test in the first place.
  18. Mo2


    Apr 8, 2016
    No one's ever hammered on these to get these failures. . They are light spine whacks on say a roll of tape or the palm of your hand.

    ZT says they do spine whack testing in qc. But they don't do light spine whacks like this.

    Apparently they have a fix if you send them in. But I'm not sure if they are fixing the issues on the assembly line for new knives.
    marrenmiller likes this.
  19. MolokaiRider

    MolokaiRider Gold Member Gold Member

    Sep 13, 2017
    My 0770 is a liner lock but holds solid. The liner mates evenly and is seated very well.

    I used the spine to crack open nuts and had no issue with the lock disengaging.
  20. bflying

    bflying Gold Member Gold Member

    Mar 4, 2014
    I wasn't going to, but at the height of that last thread, I just had to play with the tough kids. Even got out a roll of tape to keep the test as close as possible. I think I tested 15+, without a single failure. Soooo, yeah.
    Bryan J Ball, mqqn and AF like this.
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