How To Pick A Yale Lock

First, let's know how a lock works. I'll only be describing the common pin-tumbler lock (usually called a Yale lock, after its inventor in 1860). This is the kind you possibly have on your front door, with a key containing a series of mountains and valleys of various heights. While your key may slide into other locks, the height of those bumps causes whether or not it will roll.

Brass pins stop the lock cylinder from turning and un-latching the door. Each pin is in two parts, and has to be lined up accurately for the cut in the pin to match the edge of the turning cylinder. If even one of those pins (most of the locks have got five) is too high or too low the pin will bind and prevent turning.

The right key matches the cuts in the pins to set everything in alignment. If you've ever seen an old lock, or a poorly cut key, you might have to jiggle the key to get the lock to work. That's actually very similar to the process of picking a Yale lock.

Basically, finding out how to pick a Yale lock you randomly drift the pins up and down until you get them to the proper height. However, if they move easily up and down it seems impossible that you'll suddenly find them all aligned at once. Even if you did, you would not know if you didn't turn the lock then. So, step one of picking a lock is to put some torque.

You turn the cylinder of the lock, winding it with a small screwdriver, so that the pins are gripped against the chamber walls. Next, with friction the pins will not slide freely up and down, but they can be moved by tapping slightly with your lock pick. (an advanced lock pick will have a small steel spring included to help you 'twang' it and create a subtle tapping movement).

The torque should really hold that in place when you move to the second pin, and so on.

For any current Houdini picking a standard Yale lock is not too big a problem, which is why a lot of apartments and offices employ more advanced locks (for instance Medeco brand). These require accurate pin rotation combined with height.

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