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This NFCOMBO1630 Master Lock built-in combination lock features a metal dial which has a grip ring that has a non-slip coating. The coating makes it easier to enter a combo. Recessed lift handles are standard on single tier, double tier, and triple tier Lyon metal lockers. A recessed handle has a finger lift with a clean flush mount look. We also have the NFCOMBO1654 Master Lock Combination Lock for multitier steel lockers with pull handles.
Scrolling combination padlocks open by turning a scrolling mechanism to the correct combination. They secure access to property and don't require users to keep track of a key. These padlocks are commonly used on construction equipment, industrial storefront and business gates, and utility boxes.
In my last guide, I showed how you could crack the combination of any Master Lock combination padlock in 8 tries or less using my online calculator. Now, as promised, I'll be showing you how I devised the attack, which is based off the well-known technique that reduces the 64,000 possible combinations of a Master Lock down to just 100. Here, I will be drilling open a Master combo lock to show you how the insides work.
Using a Dremel, I removed the vast majority of the lock's backplate so that you could actually see what's going on inside when turning the dial. Inside, there's a collar that keeps the shackle from coming out when the lock is opened.
There is also a lever (which falls into the disk indentations when the combination is entered), a latch (which the shackles pulls up, and which controls the lever), and a return spring (the bar that pushes the lever/latch back in place after opening or closing the shackle).
Also, there are three combination disks, one for each number of the combination. The first two are attached to the shaft on the backplate, with a spring in-between the first disk and the backplate, and small plastic spacers in-between the disks. The third is connected to the actual dial.
Each combination disk has a tooth on each side of it. When the dial is rotated a couple times, these teeth all connect and turn all of the disks simultaneously. This is where you would enter in the first number in the combination, so that the recess lines up with the lever.
Next, you would enter in the second number going the opposite way. The tooth on disk 3 catches on disk 2 and moves disk 2's recess into place, without moving disk 1. When the second number is set, moving the other direction will secure the recess of disk 3 in place with the final number.
As you remember from my last guide, you had to find a resistant location. To do that, you would pull on the shackle, turn the dial, and wait for resistance. What is happening is that the unneeded tooth on disk 1 is actually slightly hitting the shackle collar, which also gets pulled up as you hold the shackle up.
To get an idea of how that affects the turn we need to make, we then have to find the circumference of the disk, which we do by measuring the distance across the disk and multiplying that number by pi (3.14). We then divide the circumference by the number of digits on the dial to get the distance in-between each digit, which can then help us figure out how many digits are needed to move the recess in the disk to under the lever.
For the third number, we take advantage of all of the notches surrounding disk 3, which interact with the lever when pulling up on the shackle with a lot of force. When you pull up on the shackle, you're looking for the resistant locations to plug into my online calculator, which is what makes my attack much simpler than the other well-known one that makes you find all of the resistant locations to see which has the biggest gap.
This is possible because of the congruency between all of the three different numbers of the combination. The first and third numbers will be congruent, and have the same modulo of 4. So, if you divide the first number by 4, whatever the remainder is will be the same as the third number divided by 4. So, we can find the two possible third numbers by comparing the locked positions with the possible numbers for the first one (ex. 2, 6, 10, 14, 18, 22, 26, 30, 34, 38).
But we can reduce it to 8 possible combinations because of the way that the lock is built. The tooth in disk 2 cannot be too close to the tooth in disk 3, which removes the possibility of the second and third number from being too close to each other, so we can cancel out any of the possible second numbers that are within 2 of the third number. So 28 and 32 are out in our example.
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The "Tooth that is not used" actually is used. Its meant to be hit by the shackle collar when opened to Relock the lock. As the shackle is fully opend the collar hits that tooth and spins it. Without that the lock would remain in the open setting unless the dial was spun. :) Excellent exploit find by the way!
Interesting point RRIS CENTAUR, but I didn't see that tooth get hit by the shackle collar when he pulled the shackle at 6:15 after demonstrating the opening process. Although that may be because his was all loose and broken apart, however.
Edit: Something I discovered as a kid (and just thought about again), is that after the correct unlock sequence you can push in/down & hold on the number dial when pulling the shackle up and pushing it back down and it does not re-lock. But yea, normally at least one of those teeth is getting hit during the shackle release or reinsert so it can re-lock.
Double Edit: Did some isolation testing and the re-locking feature happens when you put the shackle back in (not when pulling up). Could be something else other than the shackle collar that is hitting a tooth on one of the discs. Haven't opened the back of one yet (for this purpose) to see what exactly happens though.
Triple Edit: Definitely not the shackle collar, as I can swivel the shackle to the outside of the lock and move it up and down freely several times, then push in & hold on the number dial, re-insert the shackle into the lock, pull up on the shackle (while still pressing in on the dial) and it is still unlocked.
This is just what I was looking for. Ive been trying to generate it myself using online tools but I cant find anything that works. MY only issue is that my letter disks have different letter. Would it be possible to generate a list off words with the new disks.
Same letter distribution in WordLock CL-422-BK. (I just bought one from Amazon, and apparently it was a return. Someone changed the default password (SHED) before returning it.) Trying to look for an alternative to trying out all 10,000 random letter possibilities.
We just bought a bike that has a letter lock on it. We are trying the different ways to force it open, but have thus far been unable to. I found your site and wonder if there is an algorithm that will give me all the possible words with the following letters:
Hi Rob, I think I can help you out. This post shows you how you can make any 4 letter word on a combination lock (the catch is that you might have to buy two locks and mix up the parts to make it work): -any-4-letter-word-lock/
The Master Lock No. 4696D Set Your Own Combination TSA-Accepted Luggage Lock features a 1-5/16in (35mm) wide metal body for durability. The 1/4in (6mm) diameter shackle is 1-7/8in (48mm) long, offers extended reach for use on equipment cases and is made of steel, offering resistance to cutting and sawing. Transportation Security Administration (TSA) screeners can open, inspect and relock bags and cases locked with a TSA-Accepted lock. Lock your checked baggage with the lock TSA screeners won't cut! The Limited Lifetime Warranty provides peace of mind from a brand you can trust.
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Weight: 0.5 lbs.
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The Master Lock No. 175D Set Your Own Combination Padlock features a 2in (51mm) wide solid body for strength and reliability. The 5/16in (8mm) diameter shackle is 1in (25mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The 4-digit dialing allows for thousands of possible numeric combinations. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.
The Master Lock No. 1525 3-digit combination padlock includes key control feature for supervisory access along with many enhanced security features like the exclusive BlockGuard Anti-Shim technology, hardened steel shackles and double-reinforced stainless steel casing. Designed to fit lockers with a padlock eye of at least 5/16in (8mm) diameter, these locks provide multiple customization options to fit your needs.
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