A deadlock is a type of lock that can only be unlocked with a key when it’s in deadlock mode. Deadlocks can contain 3 or 5 levers, with additional levers increasing security. It can be operated using a key from either side of the door and usually works independently to any door knob/lever handles.
A deadbolt is very similar to a deadlock, but the bolt doesn’t contain levers, and instead of being locked and unlocked via a key, it’s often used in bathrooms where it’s operated via a thumbturn.
The only difference is the strength of the spring contained within the mechanism. Standard locks have a standard spring which is suitable for sprung lever handles/knobs. Heavy-duty locks have a much stronger spring which gives them the strength required to return an unsprung lever handle or door knob to its original position.
This depends on which door furniture you’re planning to use. With a lever handle, a 2.5” or 3” lock should be suitable. However, if you’re using a door knob, we recommend using a lock that’s 3” or bigger to ensure the knob is positioned far enough away from the edge of the door frame. If you use too small a lock, you risk catching your knuckles on the edge of the door when trying to turn the knob.
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