ALOA CPS key terms

A fixed obstruction inside a lock case or keyway that blocks a key from turning unless the key has a matching cut or profile to pass it. Wards are one of the oldest key-control methods.

A flat pivoting metal plate inside a lock that must be raised or lowered to a precise height by the key before the bolt can retract. Multiple levers increase security because all must align.

The notch or slot cut into a lever tumbler that catches the bolt stump or fence only when the lever sits at the correct height. A lever whose gate misses the stump keeps the lock from opening.

The bar or pin that rides in the keyway and drops into the gates of levers or the notches of discs once they align. On high-security locks it is often part of a side bar.

A movable bar that engages notches in the side of key pins or discs only when they reach the correct depth or position. It adds a second independent locking condition beyond the shear line.

The boundary between the plug and the shell of a pin tumbler cylinder. The lock opens when every pin break sits exactly on this line so the plug can rotate freely.

The top pin in a pin tumbler stack, usually spring-loaded, that sits in the shell and presses the key pin down into the plug. It crosses the shear line when the correct key is inserted.

The bottom pin in a pin tumbler stack that contacts the key directly. Its length determines the cut depth required on the key for that chamber.

The rotating cylindrical core inside a lock that holds the key pins and turns when the correct key is inserted. Also called the cylinder or barrel depending on region and lock type.

The cross-sectional shape of the slot a key must pass through, formed by the warding in the plug. It restricts which key blanks will enter the cylinder and is a basic level of key control.

The numeric or alphanumeric pattern describing the depths and spacings of cuts on a key. Locksmiths use bitting charts to originate keys and to record a lock's combination.

A number or letter sequence assigned by a manufacturer that maps to a specific bitting for a lock series. Codes let a locksmith cut a working key without the original.

A key-cutting device that uses manufacturer code books or software to translate a key code into the correct cuts and produce a finished key. It is central to automotive and commercial key origination.

A key containing a small electronic chip that broadcasts an identification code to the vehicle's immobilizer. The vehicle will not start unless the chip is present and programmed to match.

An anti-theft system that prevents engine start unless it receives a valid electronic signal from a programmed key or fob. It works independently of the mechanical lock and requires electronic matching.

The process of electronically registering a key or remote to a vehicle's computer so the vehicle recognizes it. Methods vary by make and may require diagnostic tools, PIN codes, or on-board procedures.

An uncut key body of the correct profile, groove, and thickness for a given lock or vehicle. Choosing the right blank is the first step in duplicating or originating a key.

A non-destructive technique of opening a lock by inserting a blank or specially prepared key and working the tumblers until marks reveal the correct depths. The marked key is then cut to finish.

A spring-loaded bolt or plate inside a safe that fires and blocks the boltwork if the lock is attacked, removed, or the lock body is disturbed. It protects the container when the primary lock is defeated.

The system of bolts, linkages, and levers that secures a safe door to its frame. Its strength and the number of active bolts largely determine resistance to prying and forcing attacks.

A tempered glass panel mounted inside a safe door that shatters on attack, releasing a spring-loaded relocker to jam the boltwork. It is a common secondary defense on commercial safes.

A lock opened by dialing a sequence of numbers that position internal wheels or discs to release the bolt. Three-wheel mechanical combination locks are standard on many safes.

The stack of numbered wheels or discs inside a combination lock that rotate with the dial and store the combination positions. Their alignment allows the fence to drop and the bolt to retract.

The graduated ring around a safe dial that provides the reference index for reading numbers. Accurate alignment with the index mark is essential for dialing a combination correctly.

A mechanism that prevents a safe or vault from being opened until a preset time has elapsed, regardless of the combination. It is common on bank vaults and retail safes holding cash overnight.

A large reinforced room or structure, typically with thick walls and a heavy door, built to secure high-value assets. Vault construction and door ratings are distinct from those of movable safes.

The professional service of gaining entry to a locked safe, whether by manipulation, decoding, drilling, or other techniques. It requires documented authorization and careful protection of the container's contents.

Opening a combination lock by sensing wheel contact points and interpreting dial feedback rather than by force or drilling. It is a skilled, non-destructive technique that leaves the safe undamaged.

Documentation or evidence confirming that a customer has the right to have a lock, safe, or vehicle opened or rekeyed. Locksmiths should obtain it before performing work on property the customer may not own.

A written record of the service requested, the scope of work, pricing, and customer authorization. It protects both the locksmith and the customer and documents what was agreed before work begins.

Legal responsibility for harm, loss, or damage arising from a locksmith's work or advice. Insurance and careful documentation help manage exposure when opening, installing, or servicing locks.

A system in which one key opens several locks while individual keys open only their own. It relies on additional pins or discs that create a second shear line for the master key.

The policies and practices that limit who can obtain or duplicate keys, such as restricted blanks, patented keyways, and signed authorization. Good key control reduces unauthorized duplication and liability.

Changing the tumblers or pins in an existing lock so old keys no longer work and new keys do. It is commonly done after a move, a lost key, or a change in tenants.

The measurement of how far a key is cut at a given position, expressed in increments defined by the manufacturer. Correct depths are essential for smooth operation and proper pin alignment.

A service call in which a customer is locked out of a home, business, or vehicle and needs entry. Locksmiths must verify identity and authority before opening to avoid assisting unauthorized entry.