To explain further, a bump key is made by taking a key that already fits into a particular brand of lock and filing it down; then when using the newly filed down key in a lock along with using a tool or some sort to hit the key, or bump it, until the pins bounce and open the lock. The action being similar to the motion of the parts of this popular desktop toy. This sort of burglary accounted for more than two thirds of the United States burglaries in according to Consumer Reports.
Thankfully, there are ways to help to prevent the damages that could result from this happening; homeowners can take steps to help to protect their family AND their property. We use cookies to make wikiHow great. By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article parts. Tips and Warnings. Things You'll Need. Related Articles.
Article Summary. Part 1. Start with an ordinary key. Locks and keys come in all different makes, but many keys will fit into a standard cylindrical home lock. Try it out in a few cylinder locks to see if it fits before filing it to the right specifications.
Lock bumping is such a potential problem because it can be performed with almost any key. Identify the position of the valleys in the teeth. Look at the key and observe the spacing of the teeth. In order to be able to disengage the pins of the lock, these valleys will need to be filed down all the way to the main shaft of the key.
When it comes time to modify the key, be careful not to file the valleys too shallow or deep. If the spaces between the teeth are not at the right depth, the key will be useless.
File the valleys down to their lowest position. Use a manual file a wedge or triangular shape will work best to shave down the valleys between each tooth on the key. Once the valleys are as deep as they can be, the teeth will be long enough to push up the pins in the lock when the key is struck a certain way. Make sure the teeth are level. File each valley down to the same point along the shaft of the key. If the valleys in the back are deeper, you may have difficulty pulling the key out of the lock after bumping it.
There should be a very small triangular depression in the shaft of the key at the bottom of each valley. Part 2. Insert the key into the lock. Fit the key into the lock. Push it in until it stops, then pull back slightly until you hear or feel the last pin click. This puts the pins in the right position to be manipulated by the teeth of the modified key. Keys of roughly the same size will often fit any lock with the same mechanism like a cylindrical lock.
The deeper valleys might make it prone to getting caught on the pins. Begin turning the key. Try turning the key in the unlock direction usually counterclockwise.
Keep constant pressure on the key as you work. Grip the key near the teeth to allow yourself room to hit the back end of it. It will be weaker since you removed metal from the body, and twisting it forcefully while striking it might cause it to break off in the lock.
Strike the back of the key with a blunt object. Using a mallet, the handle of a screwdriver or another broad, blunt object, strike the rear edge of the key as you continue trying to turn it in the lock.
Pull back on the key until you hear the first click before attempting the strike. Repeat until the key turns in the lock. Repeat this process, turning the key in the unlock direction the entire time, until the pins catch. Part 3. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance.
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