The Mysterious Combination Lock


Comments • 106

  • Steeven DEDEHOU
    Steeven DEDEHOU  4 days back

    HELLO! What's the default lock?

    • James Sempy
      James Sempy  1 months back

      nice tutorial.
      thanks for sharing.

      • Jensen William
        Jensen William  2 months back


        • Michael Litzkow
          Michael Litzkow  4 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  4 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  5 months back

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

              • Hans Milling
                Hans Milling  5 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  7 months back

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

                  • Scrappy Cat
                    Scrappy Cat  8 months back

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

                    • redneckzen
                      redneckzen  8 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  8 months back

                        Bangladesh ---

                        • Security safe fire proof Locker

                          I'm requirement my WhatsApp 07618249129security safe India menufactaring safe

                          • Vendy Bird Švadl
                            Vendy Bird Švadl  10 months back

                            1:03 IT looks like hard drive

                            • B B
                              B B  10 months back

                              Nice tutorial. Like the dry humour too

                              • AESTACTIC
                                AESTACTIC  11 months back

                                yeah its a LIIIIVER

                                • Paul BERDAH
                                  Paul BERDAH  12 months back

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

                                  • Bigga Winna Crapsa
                                    Bigga Winna Crapsa  12 months 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  1 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  1 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  12 months 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  12 months 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  2 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  5 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  12 months 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  12 months 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. :)

                                                                      • Bigga Winna Crapsa
                                                                        Bigga Winna Crapsa  12 months back

                                                                        They've got something for that, too, but it'll cost ya.

                                                                    • 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  12 months 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

                                                                        • NachoCheese
                                                                          NachoCheese  3 years back

                                                                          4 because 2+2?

                                                                          • aterack833
                                                                            aterack833  3 years back

                                                                            anyone else click because they thought they were going to see a new type of lock? like how the xuputopha what ever.... has "alien tech"

                                                                            • Doctorbob F
                                                                              Doctorbob F  3 years back

                                                                              That was Great, narrating.
                                                                              Who is this gifted, entertaining speaker?
                                                                              I would watch Anything narrated by him.