deadbolt
DED-bohlt
/ˈdedbəʊlt/
A lock bolt that is moved by turning a key or access knob, without the action of a spring.
A deadbolt is distinct from a spring lock because it cannot be forced open with a credit card or shim; it remains locked until physically turned.
The story behind the word. The term 'deadbolt' is a compound word. The 'bolt' is the heavy metal bar that slides into the door frame. It is called 'dead' because it has no spring mechanism to return it to the open position automatically; it is completely inert, or 'dead,' until a key or thumb-turn physically forces it to move.
Word relationships
- locking bolt: A general term for any sliding bolt, whereas a deadbolt specifically refers to a key-operated, springless mechanism.
- deadlock: Often used interchangeably, though a deadlock can refer to the state of a lock or a situation where no progress can be made.
- spring latch: A lock that automatically snaps shut using a spring, which is much easier to bypass than a deadbolt.
Commonly confused with
- latch: A deadbolt requires a key or turn to move and cannot be shimmied open, while a latch is spring-loaded and locks automatically.
Word family
- deadbolted (verb): Secured with a deadbolt lock.
Collocations
- double-cylinder deadbolt
- install a deadbolt
- deadbolt lock
- secure the deadbolt
Example sentences
- "He turned the key to slide the heavy deadbolt into the door frame." Upgrading physical locks.
Memory hook
Think of a 'deadbolt' as a bolt that is 'dead' to any attempts to push it open without a key. A deadbolt is dead to the touch; it won't budge without a key.
When not to use
Do not use 'deadbolt' for a simple spring latch on an interior bedroom door.
Fun facts
- Locksmiths recommend that a deadbolt should extend at least one full inch into the door frame to provide adequate resistance against physical force.
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