Plug The plug is the part of a cylinder lock which is designed to turn when a key is inserted. Master pins are also called master wafers. Its purpose is to allow two differently-cut keys to open the lock. Master pin In a pin tumbler lock, a master pin is an optional, usually short, disk-like pin placed between the top and bottom pins. It is responsible for transferring the action of the key to the bolt. Lock housing The lock housing is the part of the lock that does not move when the lock is opened. In warded locks, the key cuts bypass the wards so the key can push or pull the bolt. The series of key cuts on a key causes the pins to line upĪt the shear line or gate so the lock will open. Machined into a key, to allow the key to turn in its lock. Key cut A square, rounded or V-shaped depression, filed or A drill or torch may break the glass, releasing the bolts. It is attached, usually with wires, to one or more spring-loaded bolts, which are often randomly located. Glass relocking device A glass relocking device is a piece of glass, usually tempered, placed where it might be expected to break in a burglary attack. False gate A false gate is a mechanical element on levers in lever tumbler locks or discs in disc tumbler locks to make the lock more difficult to pick. Face plate A metal plate on the lockset itself (on the door, not the jamb) is called a face plate. These are often used in safe deposit boxes. Dual custody A dual custody locking system is one where two different keys, generally given to different people, are required to open the lock. Break A break in the pins is a separation in one or more sections of the pin used to encode the lock for a specific key or set of keys in a master keying system. The bottom pin is also known as the key pin. It has varying lengths, corresponding to the key's bitting cuts. Bottom pin In a pin tumbler lock, the bottom pin is in contact with the key. Bolt stump In lever tumbler locks, a bolt stump is a rectangular part located above the talon, and passes through the slot in the levers as the bolt moves. ![]() Blade The segment of a key which enters the keyway of a lockĪnd has key cuts machined into it. The bitting instructs a locksmith how to cut a certain key, to replace a lost key or make an additional copy. Bitting The bitting of a key is the physical arrangement of the bit of the key that engage with the locking mechanism. The bit is called a blade in the case of a cylinder key. ![]() Bit The section of a key which enters a lock, which has the keyĬuts formed in it and which engages the bolt or tumblers of the lock. The driver pins of a pin-tumbler lock are located in the bible. Glossary Bible 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. ![]() This is a glossary of locksmithing terms.
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