Home Picking Security Pins (532) Chinese Push Button Lock from Tjita1

(532) Chinese Push Button Lock from Tjita1


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My vises are made by Panavise, a U.S. Company.  The one with the wide jaws is the model 350.  The smaller one is the model 301. Both have the 312 Base mount – www.panavise.com



  1. Is it necessary to click in sequence 2-4-5-7 or can you press in any sequence like 2-5-7-4 or 4-7-2-5. if there is a sequence then there are ( factorial8) combination (8x7x6x5x4x3x2x1) =40320. If sequence does not matter the 8x7x6x5 = 1680 only. combinations. It would not take long to try all.

  2. I had one of these, although it wasn't Chinese made I'm sure since this was back in the 80's when I was a kid. I remember him picking much the same way when I forgot the combination.

  3. There aren't even a lot of combinations for these kinda locks… the order of the numbers doesn't even matter, that makes this lock easy to figure out even without putting tension on the shackle. You just need the 4 pins to be pushed in in no particular order, so even if you'd just tried it systematically you'd only spent a couple of minutes cracking it.

  4. It kind of blows my mind to think that there's 1680* different ways to push in four of the buttons on that lock.

    *edit: actually only 70, I didn't realize that I had to divide that by the number of sequences which are just permutations of the same number sequence which is 4! = 24 so 1680 / 24 = 70.

  5. Does it work backwards? If you pressed 7 first would it show you one out of the four numbers, or does it only click the 2 if you press it first. Either way, it would still narrow the combos from 8! to 4! which is a world of difference.

  6. But would it work the same if the code was not sequential? If for example the code was 7542 and you were trying to press each number in order, the first number you would press would be 2. Would it still plunge even though it is not the first number of the code?

  7. I own one of these locks and it have followed med from workplace to workplace. I use it for my locker – nothing valuable in them, until now: in my next workplace I will work under germ-free clean conditions, so I must store my phone, watch and other valuables in my locker. I insist on having a combination-lock, so can you guys give me a some suggestions on a new lock for my locker that works better then this one? I mean – NO lock should be opened by handforce alone.

  8. You sir have some of the very best quality in your videos. Not only your resolution. Your information is clear, and easy to understand. I have never picked a lock before, but I must say this looks like a up and coming new hobby for me. Thank you sir. subscribed!!

  9. I had this lock as a kid! I used it with a cable as a bike lock all through college, and it didn't go missing until a particularly hurried move out of a house when I was 25. I really want to start looking for a few more.

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