Q&A for How to Open Combination Locks Without a Code

Use a shim to find a flat spot next to each number and decode the lock until you have the correct combo. That's the basic process a locksmith would use with a Samsonite luggage lock with the wheels on it—they would use a shim and a flashlight and be able to determine what the code is just by looking at variations between those wheels.

Combination locks on school lockers usually have a series of numbers stamped on the back. A locksmith can plug that number into a program, which provides the original combo for that lock. With a Master Lock type of lock, move the dial and look for indicators from the shackle—as you get closer to the correct combo, the shackle will pop out a little bit further with each correct number.

Creating a "shim", as explained above, will allow you to open the lock without working the code.

Use the pulling process above, just like picking locks you need tension to set pins, so just enough tension (which varies with each brand) and it's half the job done. The wheels aren't all the same, minor imperfections are what you exploit. It might take a little time and practice.

Just take the number minus 40. If it locks on 39, then you add five, it would go to 44, which would be 4.

Most of the time, yes. My school provided us with a piece of paper with a combination on it. Some teachers should also have a key to open the lock. If you lose or forget your combination, you can ask for the combination from someone with authority.

It could, depending on the quality of the lock. Ball bearing locks cannot be shimmed, spring loaded ones can.

You need a master lock speed dial key to set a combination, so the answer is no.

Usually, that means you have one of the other numbers wrong. You can use the long method of dialing the first two numbers in each time you tray a new third number. Quite often, when you are lifting the shackle, the dial will shift slightly, this causes the whole process to reset.

Briefcase combination locks can be opened with bolt cutters or a hacksaw. Use caution though, to avoid harming either yourself or the briefcase. Wear protective gloves, eye protection, and ear plugs.

They usually come with a key. If not, then consult the owner of the lock and try the shackle method.

The default factory combination for Master combination locks is 0-0-0.

Try a different number. The easiest method to find it is trying every number for the third number.

Turn dial clockwise past '0' at least three times, stop on the first number to the combination. Then, turn dial counter-clockwise and pass your combination's second number once, stopping on that number the next time around. Finally, turn the dial clockwise to the third number in your combination. Open. This is how every school/gym style combo lock works. If your lock fails to open, you may have incorrectly identified a number in your combination. Using 'Method 1: Crack the Code' does work. It took me about a dozen tries/20 minutes. The second number gave me the most difficulty, and was the last that one I discovered. Patience and perseverance are most helpful.

There is a master key that most teachers have to open built-in locks. That is the only way you can get into it.

Unfortunately that means that the only real option you have is to either go to a locksmith to give you a master key, or just use bolt cutters.

If you can find its serial number, then you can send it to the manufacturer and they should be able to give you the combination or key code for it.

Shims are usually best used on locks with dials, such as school or gym locks. However, the may work on key locks as well, typically the older ones.