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 – 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: