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Locks Keys

Minimal Movement Bump Key

Key bumping is a underground door technique alongside pin-tumbler locks that makes use of a specially equipped key to “bump” top pins on top of the shear-line to allow the plug to rotate. There are two sorts of key bumping, pull-out and minimal movement, but both build like forensic facts to the bump key and also the lock.

Key bumping is analogous in function to pick guns

To bump a combination lock, a key’s acquired that matches the keyway in the lock. The key is bespoke so that each one the cuts are at their lowest depths or lower. This is commonly known as a “999 key,” since 9 will likely be the designated lowest cut depth. If done by hand, a key gauge or micrometer can be utilized to measure the key furthermore make sure cuts are deep enough. If done using a key contraption, the key could possibly be duplicated from the working bump key, or cut by code to the lowest depths.

During the pull-out manner, the key is inserted into the combination lock completely then withdrawn one pin space. Inside minimal movement method, the key is more bespoke by removing objects from the tip and shoulder of this key. The minimal-movement key is inserted totally inside the lock. In both cases, easy pressure is applied to the key and a device (often called a bump hammer) is used to bang the bow of the key, causing the key to become forced into the padlock. The impact on the key causes kinetic energy to go from your key to the pins, causing the top pins to momentarily budge.

If all of the  top pins jolt over the shear-line at the same time as tension is applied the plug is free to rotate.

As with pick guns, the leading supply of forensic indication of bumping is in the pins themselves. The engagement of striking the bump key within the lock creates apparent dents and scratches on the bottom pins. Bumping as well impacts the face among the plug, the keyway profile, pin chambers, topmost pins,  bump key itself. For forensic examination of bump keys, see the Key Analysis page.

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Key Lock Bumping

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