The Mysterious Combination Lock


Comments • 110

  • Matt E
    Matt E  3 weeks back

    I get this urge to throatpunch the narrator.

    • Elmer Buckwhistle
      Elmer Buckwhistle  2 months back

      A 30 dollar tubular key pick available on eBay or Amazon opens this "safe" in about 20 seconds. You can learn how to use this simple pick here:

      • Christine Walker
        Christine Walker  2 months back

        Great video. Always wondered and now I know!

      • Steeven DEDEHOU
        Steeven DEDEHOU  3 months back

        HELLO! What's the default lock?

        • James Sempy
          James Sempy  5 months back

          nice tutorial.
          thanks for sharing.

          • Jensen William
            Jensen William  5 months back


            • Michael Litzkow
              Michael Litzkow  7 months back

              I'd like to see the mechanism by which it takes a different number of turns to move each subsequent gate.

              • david,r. massey
                david,r. massey  7 months back

                With out a long story i can get in any of these 1 thru 100 dials in these safes in usually less than two minutes. This illustration only points out what i learned the hard way. Once you realize that all the com #'s are at 45 degree angles to a cross hairs on a rifle scope it's just mathmatics , geometry, and odds. Math possibilities are substantially reduced by knowledge of the layout of the tumblers. Went in a safe store walked up to the most expensive ,heavest safe that was locked, and opened it in under 2 minutes. The owner, who was grinding keys for 4 Mexicans up front said - - "who the "F" are you", while the 4 guys laffed their sides off.

                • Martin Gonzalez
                  Martin Gonzalez  8 months back

                  Muy interesante, muy entendible y muy divertido...Jajaja muchas gracias por compartir esta enseñanza... Saludos desde Monterrey México..!!

                  • Hans Milling
                    Hans Milling  8 months back

                    Awesome, I am going to make a 3D model for 3D printing. I always wondered how a combination lock works, and now I know, so now I want to build my own as a proof of concept to show others.

                    • allenc a
                      allenc a  10 months back

                      how do you know the number 55-23-62 is right?

                      • Scrappy Cat
                        Scrappy Cat  11 months back

                        I've often wondered HOW my safe lock works. Thanks for an excellent but very informative explanation !

                        • redneckzen
                          redneckzen  11 months back

                          Excellent! Thanks so much for this. I have a stuck lever that requires dialing to the number 8 and banging on the door. I really need to get that replaced, don't ya think? Thanks again. I now understand why my lock is giving me fits!

                          • md mizanur Rahmna
                            md mizanur Rahmna  11 months back

                            Bangladesh ---

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                              • Vendy Bird Švadl
                                Vendy Bird Švadl  1 years back

                                1:03 IT looks like hard drive

                                • B B
                                  B B  1 years back

                                  Nice tutorial. Like the dry humour too

                                  • V i B E S
                                    V i B E S  1 years back

                                    yeah its a LIIIIVER

                                    • Paul BERDAH
                                      Paul BERDAH  1 years back

                                      How do you set the combination and how you select the order. PLS

                                      • Bigga Winna Crapsa
                                        Bigga Winna Crapsa  1 years back

                                        There is a 'change key' that can be inserted into the back of the lock. There is a video on here showing it being done.

                                    • Lockpicking Pete
                                      Lockpicking Pete  1 years back

                                      Amazing kind of humor and still very educative!

                                      • ashok salve
                                        ashok salve  1 years back

                                        It is nassesary to chick possibly

                                      • joseph johnson
                                        joseph johnson  1 years back

                                        I forgot my code an dering my move some how the ss# sticker got scratched off does anyone know the answer to what is the factory code for a 4 number combination s&g combination lock on a centurion safe

                                      • capt Midnite
                                        capt Midnite  1 years back

                                        Brilliant vid and thank you for posting, I'm on the first rung,

                                        • I'll never Tell
                                          I'll never Tell  2 years back

                                          So basically, based on what I've seen here, the 'click, click, clunk' method you see in the movies just doesn't work

                                          • howard inheaven
                                            howard inheaven  2 years back

                                            My Sargent and Greenleaf combination lock has to be turned right to zero after the last number, held stationary while a small knob in the center is turned 45 degrees to the right, and the complete dial is then turned to the right until the lock is released. It takes two hands to operate it successfully.

                                            • FlyToChina0071
                                              FlyToChina0071  2 years back

                                              Nice video with a sense of humor. Not sure if I ever gonna need the informtions, but still worth watching for 7 minutes or so

                                              Cheers from Denmark - Adam

                                              • oriana garrido
                                                oriana garrido  2 years back

                                                I like this narrator
                                                It makes me feel compelled to entering the door on my left

                                                • alex Lo
                                                  alex Lo  2 years back

                                                  It doesn't show how anyone wheel can rotate stick to each numbers of revolution.

                                                  • Bigga Winna Crapsa
                                                    Bigga Winna Crapsa  1 years back

                                                    There are little 'catches' on each wheel that pick up the next wheel as the dial is turned in the same direction.

                                                • Steffen Hansen
                                                  Steffen Hansen  2 years back

                                                  Does he have a cat scratch-tree in his safe??? :O :D

                                                  • Dave Joseph
                                                    Dave Joseph  2 years back

                                                    Doesn't the drive cam gate and level nose make a slight sound that would give away the position of one of the combination positions?

                                                    • Bigga Winna Crapsa
                                                      Bigga Winna Crapsa  1 years back

                                                      It would actually be the lack of sound - the slow turning of the dial, a few numbers at a time, listening until you hear LESS sound, indicating the fence is over empty space. That is why the Manipulation Proof version of this lock holds the fence above the wheels until the combination is dialed, then a knob in the center of the dial is turned, lowering the fence into the 3 wheels. Beyond that they have locks with plastic wheels to foil x-rays.

                                                  • theAsocialApe
                                                    theAsocialApe  2 years back

                                                    That was illuminating. Thank you.

                                                    • lesmoor kelly
                                                      lesmoor kelly  2 years back

                                                      wow i learnt so much i had no idea how they worked

                                                      • タンゴ Txngo
                                                        タンゴ Txngo  2 years back


                                                        • dcpc08161992
                                                          dcpc08161992  3 years back

                                                          Wow, great video. I feel like I know more about the combo lock than I ever thought.

                                                          • Chad Chadman
                                                            Chad Chadman  3 years back

                                                            I was with you up until... Welcome !

                                                            • elton laos
                                                              elton laos  3 years back

                                                              this is so nicely explained, i always wondered how it works. THANK YOU :D

                                                              • Wood 'n' Stuff w/ Steve French

                                                                Haha, I enjoyed the humor.

                                                              • Harvard
                                                                Harvard  3 years back

                                                                Who else fell asleep

                                                                • Aunt Floyd
                                                                  Aunt Floyd  3 years back

                                                                  Moved into a house that has an old school Mosler, its weights a ton and I don't know the combination and don't know what the prior tenants left in it? Any suggestions?

                                                                  • HighSpeedNoDrag
                                                                    HighSpeedNoDrag  9 months back

                                                                    Find a Security and or Safe Manufacturing/Sales Company and they should be able to directly assist in the matter. If they can't, they will most likely Know Whom to contact.

                                                                  • Bigga Winna Crapsa
                                                                    Bigga Winna Crapsa  1 years back

                                                                    Yes. Learn how to spell 'weighs'.

                                                                • Saharuddin Salleh
                                                                  Saharuddin Salleh  3 years back

                                                                  hi...i have this type of safe at home..the brand name 'kano' from korea just cost me around 300usd for smallest one..

                                                                  • meowsthi
                                                                    meowsthi  3 years back

                                                                    Ha, well written. Love it!

                                                                    • Derek Broestler
                                                                      Derek Broestler  3 years back

                                                                      AWESOME video... been trying to explain safe locks to both friends and customers alike... USUALLY they just tune out (then again, I've never tried the "this is a thumb, but that's not important right now" approach)

                                                                      • HifiCentret
                                                                        HifiCentret  3 years back

                                                                        I'd very much like to see a cut away group 2M lock in action! Somehow all the videos here on youtube only show the regular Group 2 lock. Curious about the extra security against manipulation looks in action.
                                                                        Perhaps also a Group 1 would be nice.

                                                                        • sed6
                                                                          sed6  3 years back

                                                                          Great video! What's the difference between the brass level and the steel (grey) levers? Saw it in this or another video and can't find it again.

                                                                          • Bigga Winna Crapsa
                                                                            Bigga Winna Crapsa  1 years back

                                                                            The brass bolt is operated by the dial in front of the safe. The steel rod is activated if someone knocks the dial off with a hammer and then pounds the center spindle out, trying to sneak in cheaply. That would knock the back off the lock and trigger the steel bolt which would prevent the door from being opened. Examine 6:39 closely.

                                                                        • Jan Werbiński
                                                                          Jan Werbiński  3 years back

                                                                          Possible to fast breach with xray camera. :)

                                                                        • Miles Jackson
                                                                          Miles Jackson  3 years back

                                                                          Informative AND entertaining! Kudos to S&G and Mr. Costley for an outstanding production!

                                                                          • Ronan Smith
                                                                            Ronan Smith  3 years back

                                                                            At 0:47 in the video, what is second cutout in the cam for? The one that looks like that spring loaded bolt is pointed at it. Some kind of fail safe? Does lock tampering engage that bolt into the gear if someone tries to break into the safe?

                                                                            • Bigga Winna Crapsa
                                                                              Bigga Winna Crapsa  1 years back

                                                                              Also, at 6:39 you can see a spring-loaded bolt stop effectively stopping the brass bolt from being retracted (because the back of the lock is off.) The back of the lock, once screwed back on, will press down on the trigger, pulling the stopper out of the brass bolt.

                                                                            • Ronan Smith
                                                                              Ronan Smith  3 years back

                                                                              Thank you

                                                                            • Miles Jackson
                                                                              Miles Jackson  3 years back

                                                                              Yes, you've answered your own question correctly. More specifically, hammering the dial off the front of the safe can be done in a way that the spindle shears off. One could then hammer (with a punch) on the spindle and drive the back off the lock. In some earlier lock designs, this attack COULD allow the bolt to be pushed away from the big gear, allowing the safe to open. In the design shown, if the back of the lock is compromised, that spring-loaded bolt is released, permanently locking the safe.

                                                                          • Landon Stewart
                                                                            Landon Stewart  3 years back

                                                                            Painful to watch