What Locks Are Bump Key Proof?
"Bumping" a lock is a quick way to open many pin mechanism locks. Although the technique was first used in the early 20th century, it has received a great deal of popular attention in the media. Does this Spark an idea?
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Bumping
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A key-opened lock works by using a line of spring-tension pins. When a key of the right design is inserted, the pins align in a way that allows the lock to turn. The impact of a bumped key makes the pins jump. When the pins jump, the bump key can slide all the way in, then turn the lock just like the proper key.
Quality Locks
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Some high-quality locks are more bump-resistant, especially some of the newer models. Many older high-end locks are actually more vulnerable to bumping because these high-precision locks respond more smoothly, thus the springs will jump more readily. Stronger locks can take a harder hit with a hammer without jamming.
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Rotating Disk Locks
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A rotating disk lock uses a series of rotating disks rather than a series of spring-tension pins. Bumping doesn't work on these locks since there are no springs to allow the pins to jump.
Combination Locks
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Combination locks don't open with a key and are immune to bumping. This is true of all combination locks, from a simple bike lock to an electronic keypad.
High-tech Locks
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Key card locks and magnetic entry locks are also immune from bumping. Without pins or a keyhole, there's no place to put a bump key.
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