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Deadbolt door locks. Keypad deadbolts. Electronic deadbolts. Wireless deadbolts. Key-less deadbolts
The latch bolt in a common door lock is spring loaded and can be retracted by applying force to the latch. Sometimes all it takes is a credit card to open a locked door! On the other hand, a deadbolt cannot be moved, either way, by force because the locking mechanism is different from the common spring loaded door lock. The deadbolt can not be moved to the open or closed position without a key or turn handle. In a common spring loaded lock the latch bolt, at the very best, extends up to 1/2" (13 mm) into the door jamb and is movable by external force. Compare this with a deadbolt lock where the locking bolt extends at least 1" (25 mm) into the door jamb and can not be moved by external force. Because of these reasons a deadbolt door lock is your best choice of making your home burglar proof. Not all deadbolt locks are created equal, so check out the features offered by different manufactures. Some of the features and models available are keypad deadbolts, electronic deadbolts, wireless deadbolts and key-less deadbolts. Just make sure that the lock is solid and made by a reputable manufacturer.
Single or double cylinder deadbolt locks?
There are basically two types of deadbolt locks: single cylinder and double cylinder.
I prefer single cylinder deadbolts as the double cylinder deadbolts could cause a fatal disaster. Let me explain. To operate a single cylinder deadbolt lock you need a key (from exterior side) or turn handle (from interior side). The drawback is that a burglar could smash a nearby window, reach inside and use the turn handle to gain entry to the house. But you still can stop him by reading TIP-1
A double cylinder deadbolt lock has no interior turn handle and a key is required to lock or unlock the door from either side and this could be a major safety issue in the event of a fire when people are rushing to exit the house. Please read TIP-2
Bottom lock: Spring loaded latch bolt.
Top lock: Single cylinder deadbolt.