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2. Dead bolt - Wikipedia

   en.wikipedia.org/wiki/Dead_bolt

   Door with two locks, one in the doorknob and a separate deadbolt. A deadbolt or deadlock is a type of lock morticed into a wooden door. Then, using a key from either side of the door, a bolt is thrown into the door frame, thus securing the door. [1] It is distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle.

3. Latch - Wikipedia

   en.wikipedia.org/wiki/Latch

   Latch. A latch or catch (called sneck in Northern England and Scotland) is a type of mechanical fastener that joins two (or more) objects or surfaces while allowing for their regular separation. A latch typically engages another piece of hardware on the other mounting surface. Depending upon the type and design of the latch, this engaged bit of ...

4. Mortise lock - Wikipedia

   en.wikipedia.org/wiki/Mortise_lock

   Mortise lock. The two main parts of a mortise lock. Left: the lock body, installed in the thickness of a door. This example has two bolts: a sprung latch at the top, and a locking bolt at the bottom. Right: the box keep, installed in the doorjamb. A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket ...

5. Deadlock - Wikipedia

   en.wikipedia.org/wiki/Deadlock

   Livelock is a special case of resource starvation; the general definition only states that a specific process is not progressing. Livelock is a risk with some algorithms that detect and recover from deadlock. If more than one process takes action, the deadlock detection algorithm can be repeatedly triggered. This can be avoided by ensuring that ...

6. Glossary of climbing terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_climbing_terms

   Sequence of bolts that are so close together, they can be used by aid climbers as a ladder. bolt hanger. Also hanger. A piece of metal that is pre-attached to a bolt (i.e. before the bolt is screwed in) into which quickdraw s can be clipped. bolt runner A term to describe a bolt that has no bolt hanger; will require a rivet hanger to be used by ...

7. Glossary of locksmithing terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

   The bible is the part of a pin tumbler lock that contains the pins and pin stack springs as well as the pin stacks themselves. The driver pins of a pin-tumbler lock are located in the bible. Bit The section of a key which enters a lock, which has the key cuts formed in it and which engages the bolt or tumblers of the lock.