Combination Locks

Dial-up security

If you’re looking for a convenient keyless lock, combination devices are a good option. With a combination lock, a number of different numbers or symbols are arranged into a pattern to open the latch. If you’re looking for residential uses, most combination locks will have a single dial that must be turned in a particular sequence.

Combination locks are also popular for portable uses. If you’re using it as, for example, a bicycle lock, the combination will usually be worked out in a row on a number of dials.

How They Work

By entering the correct combination, you’ll position a number of latches within the lock so that as the code is completed the latches will release the fastener.

With portable versions, the locking mechanism and the combination dial are all one piece. The row of dials will usually be connected directly to a number of pins or latches that fall into a plug when turned correctly. When the pins are securely in place, the lock will be able to slide out of its casing.

The single-dial locks found on padlocks or door security work a little differently because they don’t have all the pins connected to individual dials. You’ll have to dial the numbers in a certain order and a certain direction to properly enter the combination. By entering the combination properly a number of notches within the lock will line up and release the mechanism.

Lock Picking

While it’s possible to pick a combination device, it’s not as easy as working with a key lock, such as a pin tumbler. Because of the casing that holds the locking mechanisms, it’s not possible to manipulate the pins or latches to simply override the need for a combination.

The most common weakness found with combination mechanisms is that it can sometimes be easy to figure out the code. Some locks will even give subtle clues as to the combination! An experienced lock picker will be able to hear or feel things like the drop of a pin or the latch of a notch.

Furthermore, some manufacturers have known patterns for their codes. If someone gets a hold of only one or two of your combination numbers, they may be able to figure out the rest simply by following these patterns. To avoid this problem, make sure you purchase a lock that you can change the combination to and then make sure you change it!

Portable combination devices can also be easy to break. Because the combination dials and the lock are all one piece it’s possible to snap the entire mechanism with the right amount of force.

While there are certain weaknesses to a combination lock, most security experts agree that, as a keyless lock, they’re still more reliable and durable then a key model that can be relatively easily picked.