January 2008
Types: Consider your security needs and the type of lock that is already on your door
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Single-cylinder deadbolt Outside, a metal collar surrounds the lock cylinder. Inside, there’s a thumb-turn handle. Pluses Many models from which to choose. Least expensive. Relatively easy to install. But Not the best choice for doors with glass that could be broken by a would-be burglar. |
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Double-cylinder deadbolt Instead of a thumb-turn handle, the inside portion has a key slot, same as on the outside. Pluses More secure than single-cylinder for doors with glass in or around them. Easy to install. But Inside key needs to be readily accessible for a quick escape. Many municipalities ban these locks since they can hamper a quick exit in an emergency. |
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Surface-mount deadbolt A D-shaped housing is mounted on the back of the door; may be single- or double-cylinder. Pluses Less susceptible to being opened by hammering and sawing than other types of locks. But Housing may seem bulky and obtrusive. Can also be difficult to install on some doors. |
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High-security deadbolt Have unique pin configurations, hardened cylinders, and other burglar-thwarting designs. Pluses Most resistant to picking and drilling. Don’t allow unauthorized key duplication. But Most expensive. Can be inconvenient and expensive to get additional copies of keys made. |
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