<![CDATA[ - BLOG]]>Fri, 15 Dec 2017 19:06:03 -0800Weebly<![CDATA[How to Bump a Lock]]>Mon, 02 Jun 2014 13:35:54 GMThttp://discount-locksmiths.com/3/post/2014/06/how-to-bump-a-lock.html"Bumping" a lock vs. picking a lock. - Bumping, also referred to as "rapping" is not a new technique for opening locked car doors. In fact, it's been around for at least half a century! When this method is used correctly it is extremely effective in over 90% cylinder type locks. As with any other lock picking technique it requires some time and patience to be able to master. A bump key is a key in which all the cuts are at the maximum depth (999). Bump keys can be cut for standard pin tumbler type locks as well as "dimple" locks.
Make sure the key you use fits inside the lock you intend to circumvent. In most cases, a particular model of lock will accept all keys from that model because only the teeth of the keys are different. In other words: once you have an Acme-model bump key, it could open all other Acme-model locks.
Obtain a bump key. There are two ways to produce a bump key: one way is buy the type of key for the model lock in question and ask the locksmith to lathe a "999" key, a kind of key where all the valleys are at the deepest possible setting. Asking for a 999 key might be considered somewhat dubious.
Cut your own bump key. Have a copy of the key in question made, then use a metal file to create your own bump key at home. Simply file all the valleys down so that they are even with the lowest point in the teeth. If you do this, the bump key may not necessarily open all locks for the corresponding model because a different lock may need a key with even lower valleys.
Insert the key into the lock, then pull it out one "click," so it is almost in all the way, but not quite. While pushing or pulling on the edge of the key in the desired turning direction, sharply strike the back end of the key with a solid object such as the back of a screwdriver. If done correctly, the key will turn in the direction it is being pushed or pulled in, and the door can then be unlocked. If not, simply repeat this step until it works or you decide to stop.
  • Bumping works best on high-quality locks because the tumblers and cylinders move more smoothly.
  • If you want to go undetected, place a small strip of soft, shock-absorbent material on the top edge of the key where it physically touches the lock. Otherwise, when you bump the key, it could dent the lock.
  • Almost all locks operate the same way: Tumblers are pins that are cut in two at different points, thus the term, "pin stack." When you insert a key into a lock, the angled teeth aid in raising the pins to allow for eventual rest at an appropriate height in the valley. If you're using the right key in the right lock, the divisions in the pins match-up with the top part of the cylinder, called the shear line. Now the top pins are outside the cylinder and the bottom pins are inside, allowing the lock to turn freely. When you bump a lock, the energy from the strike is transferred from the key, to the bottom pins, producing enough energy to essentially bounce the top pins outside the cylinder so the lock can turn.
  • Not all locks are able to be bumped. Here is a list of Bump Proof Locks