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Glossary of locksmithing terms

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This is aglossary oflocksmithing terms.

Glossary

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This sectionneeds expansion. You can help byadding missing information.(July 2025)

Bible: Thebible^[1] is the part of apin tumbler lock that contains the pins and pin stack springs as well as the pin stacks themselves. Thedriver pins of a pin-tumbler lock are located in the bible.
Bit: The section of a key which enters a lock, which has the keycuts formed in it and which engages the bolt or tumblers of the lock.The bit is called a blade in the case of a cylinder key.^[2]
Bitting: Thebitting of a key is the physical arrangement of thebit of the key that engage with the locking mechanism. The bitting instructs a locksmith how to cut a certain key, to replace a lost key or make an additional copy.
Blade: The segment of a key which enters the keyway of a lockand has key cuts machined into it. On a bit key the blade is called abit.^[3]
Bolt stump: Inlever tumbler locks, abolt stump is a rectangular part located above the talon, and passes through the slot in the levers as the bolt moves.^[4]
Bottom pin: Seekey pin.
Break: Abreak in thepins is a separation in one or more sections of the pin used toencode the lock for a specifickey or set of keys in amaster keying system.
Driver pin: In apin tumbler lock, the driver pin is in contact with the spring and interferes with the rotation of the plug when no key is inserted. When the pins are above the plug, the driver pin is also known as the top pin.
Dual custody: Adual custody locking system is one where two different keys, generally given to different people, are required to open the lock. These are often used insafe deposit boxes.^[5]
Face plate: Ametal plate on thelockset itself (on the door, not the jamb) is called aface plate.
False gate: Afalse gate is a mechanical element on levers inlever tumbler locks or discs indisc tumbler locks to make the lock more difficult topick.
Glass relocking device: A glass relocking device is a piece ofglass, usually tempered, placed where it might be expected to break in a burglary attack. It is attached, usually with wires, to one or more spring-loaded bolts, which are often randomly located. A drill or torch may break the glass, releasing the bolts.
Key cut: A square, rounded or V-shaped depression, filed ormachined into a key, to allow the key to turn in its lock. Inpin tumbler locks,the series of key cuts on a key causes the pins to line upat the shear line or gate so the lock will open. In warded locks, the key cuts bypass the wards so the key can push or pull the bolt.^[6]
Key pin: In apin tumbler lock, the key pin is in contact with the key. It has varying lengths, corresponding to the key's bitting cuts. When the pins are above the plug, the key pin is also known as the bottom pin.
Lock housing: Thelock housing is the part of the lock that does not move when the lock is opened. It is responsible for transferring the action of the key to the bolt.^[7]
Master pin: In apin tumbler lock, a master pin is an optional, usually short, disk-like pin placed between thetop andbottom pins. Its purpose is to allow two differently-cut keys to open the lock. Master pins are also called master wafers.
Plug: Theplug is the part of a cylinder lock which is designed to turn when a key is inserted.
Plug follower: Aplug follower is a device used in the assembly and disassembly of locks; it is a solid cylinder that is used to push theplug out of the lock, while preventing the springs and driver pins from moving.^[8]
Relocking device: Arelocking device (RLD) (a.k.a. "external relocker") is an auxiliary locking device intended to be activated during an attemptedburglary of a safe orvault. Such a device will keep a safe or vault locked even if the primary lock is defeated. This independent mechanism is designed to maintain the locked state of a safe even if the lock itself is destroyed. This auxiliary locking device usually consists of a spring-loaded bolt of some type, held in check by a bracket or cable that is rigged to release the mechanism in a burglary attempt. The device will either block the main boltwork from retracting or block the door from opening. Glass relockers are one of the most common types of relockers used in today's safes. Relockers are typically designed for one-time activation, meaning that once they are triggered the device is locked "permanently" and can only be opened by brute force.
Security pin: Asecurity pin is apin designed in a non-standard way to makepicking the lock more difficult.^[9] Examples of security pins include serrated pins,spools, and mushroom pins.^[9]
Shear line: In acylinder lock, theshear line (also known as thesplit line in Australia), is where the inner cylinder (plug) ends and the outer cylinder begins. When abreak in the pin is reached bypicking, the pin will "hang" at the shearline due to the space between the inner and outer cylinder. This "imperfection" in the lock mechanism is an unavoidable defect in the manufacturing process that allows forlock picking.
Snib: Asnib is a device to engage or disengage a lock without the use of a key. InScottish English orIrish English, the word is sometimes used as a synonym for lock.^[10]
Spool pin: Aspool pin is a type ofsecurity pin used to prevent picking in apin tumbler lock. The pin is shaped like acable reel.^[9]
Strike plate: Astrike plate is ametal plate affixed to adoorjamb with a hole or holes for the bolt of thedoor. When the door is closed, the bolt extends into the hole in the strike plate and holds the door closed. The strike plate protects the jamb against friction from the bolt and increases security in the case of a jamb made of a softer material (such aswood) than the strike plate.Some strike plates have their hole size and placement calculated so a spring-bolt extends into the hole, but an adjacent anti-retraction device remains depressed, preventing the bolt from being retracted unless the lock is turned.
Talon: The part of the bolt of a lock upon which the key presses as it is turned.^[11]
Thermal relocking device: Designed as a defense againsttorch attacks, these are simplyrelocking devices equipped with afusible link designed to melt and release the relocking device if the temperature inside the door exceeds a certain temperature (usually 65 °C), as would happen in a torch attack.
Top pin: Seedriver pin.
Warding: The grooves and protrusions of an irregularly shaped keyhole and/or the internal passage of a lock that requires a key be of a certain shape to be inserted.

References

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^"What Is A Lock Bible?".Apex Security. 15 Sep 2018. Archived fromthe original on 23 November 2021. Retrieved23 Nov 2021.
^Keith Mayers (1979),A Dictionary of Locksmithing(PDF), p. 3,ISBN 0-9604860-0-3, archived fromthe original(PDF) on 2022-01-20, retrieved2021-06-21
^Keith Mayers (1979),A Dictionary of Locksmithing(PDF), Joseph Mayers & Company, p. 4,ISBN 0-9604860-0-3, archived fromthe original(PDF) on 2022-01-20, retrieved2021-06-21
^Mick Friend (2004),The Encyclopaedia for Locksmiths, Authors OnLine, Ltd., p. 34,ISBN 0-7552-0117-5
^"What Is a Safe Deposit Box?".NerdWallet. 31 October 2016. Retrieved2 November 2018.
^Keith Mayers (1979),A Dictionary of Locksmithing(PDF), p. 35,ISBN 0-9604860-0-3, archived fromthe original(PDF) on 2022-01-20, retrieved2021-06-21
^"Lock Housing with Bolt".Historical Locks. Retrieved23 Nov 2021.
^Ollam, Deviant (2012).Practical lock picking : a physical penetration tester's training guide. Syngress/Elsevier. pp. 102–106.ISBN 978-1597499903.
^^a ^b ^c"Security Pins".Art of Lock Picking. 24 February 2016. Retrieved8 October 2018.
^"snib | Definition of snib in English by Oxford Dictionaries".Oxford Dictionaries | English. Archived fromthe original on September 14, 2017. Retrieved1 November 2018.
^"snib | Definition of talon in English by Your Dictionary".Your Dictionary | English. Retrieved4 March 2020.

External links

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v t e Locks,locksmithing,lock picking, andsecurity alarms
Fundamental concepts	Access control Authentication Key control Key duplication Key relevance Master keying Password Physical security Rekeying
Lock hardware	Bitting Interchangeable core Key blank Key code Key retainer Lockrod Lockset Bored cylindrical lock Mortise lock Rim lock Single-point locking Three-point locking
Keys	Berlin key Car key Keychain Skeleton key Smart key
Mechanical locks	Warded lock Pin tumbler lock Disc tumbler lock Lever tumbler lock Magnetic keyed lock Padlock Combination lock Rotary combination lock Time-delay combination locks Time lock Tubular pin tumbler lock Wafer tumbler lock
Electronic locks	Electromagnetic lock Electronic lock Electric strike Keycard lock
Other lock types	Bicycle lock Bramah lock Chubb detector lock Child safety lock Kensington Security Slot Latch Luggage lock Power door locks Protector lock Real-estate lock box Steering-wheel lock The Club
Lock picking	Lock bumping Locksport Slim Jim Snap gun
Door hardware	Dead bolt Door chain Door closer Door frame Door furniture Door handle Door security Doorstop Hinge Night latch
Emergency access/exit	Crash bar Electromagnetic door holder Emergency exit Emergency light Exit control lock Exit sign Knox Box
Security alarms	Alarm device Alarm monitoring center Car alarm Card reader Closed-circuit television Door loop Dual loop Fingerprint scanner Glass break detector Heat detector Key switch Keypad Miniature snap-action switch Motion detector Occupancy sensor Passive infrared sensor (PIR) Perimeter intrusion detection Photoelectric sensor Piezo switch Pressure switch Proximity card Reed switch Tripwire Ultrasonic transducer Vandal-resistant switch Water detector Window security
Miscellaneous	Glossary of locksmithing terms John M. Mossman Lock Museum Key to the City Lock Museum Lock Museum of America Musée de la Serrure Puzzle lock
Category:Locksmithing Keys Locks Book

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