Lock Bumping Derby

What Is Lock Bumping?

Lock Bumping is the name given to the technique that is widely used by locksmiths

to open pin tumbler locks when people have lost their keys and locked out of either their home or workplace.

Unfortunately, due to the internet, it has become public knowledge, and burglars are now using it

to break into properties usually leaving no evidence that a break-in has occurred, making insurance claims very difficult!

There are lots of videos on YouTube showing you how to make bump keys and how to bump locks,

there are also lots of websites on the internet now selling ready-made bump keys and hammers including Amazon!

The Picture Below Shows a Typical Bump Key:lock bumping derby

Lock Bumping Derby – Video Demonstrations

American and Australian news channels have both highlighted the problem, these videos can be viewed again below:

What Makes Lock Bumping Possible?

A typical pin tumbler cylinder consists of five main parts,

the body, the plug, the keyway, upper pins, lower pins and springs,

with the correct key inserted into the keyway in the plug both the

upper and lower pins will line up at what is known as the “shear line”,

 creating a slight gap between the body and the plug

 allowing the plug to rotate inside the body and the cylinder to open.

Lock Bumping involves using a specially cut key with all of the grooves cut to their lowest points.

When inserted into a cylinder lock with a matching keyway and struck with a suitable object

it allows for the transfer of kinetic energy to go through the upper pins

and into the lower pins, this action will enable them to all jump up at the same time

and for a split second settle at the shear line, so when the key turns at the very moment when the pins clear the shear line it will

allow the cylinder lock to open just in the same way as it would do if the correct key was inserted and turned.

Lock Bumping Derby – References

Further information about lock bumping is available on the following websites:

Wiki Info

Lock Advisor

Derby Locksmith- Ultion Locks

Ultion – The Ultimate Protection Against Lock Snapping & Lock Bumping!