ALOA CML key terms

The boundary between the plug and the shell of a pin tumbler lock where the driver pins rest when the lock is locked. When the correct key is inserted, the pin breaks at this line and the plug can rotate.

The rotating cylindrical part of a pin tumbler lock that the key enters. It turns within the shell only when all pins align at the shear line.

The fixed outer body of a pin tumbler lock that houses the plug and the pin chambers. It does not move; the plug rotates inside it.

The raised section of a lock shell containing the vertical chambers that hold driver pins and springs above the plug. It sits over the plug's pin chambers.

The pin in the upper chamber of a pin tumbler lock, pushed downward by a spring. It blocks plug rotation until the correct key raises it clear of the shear line.

The lower pin in a pin tumbler lock that rests in the plug and contacts the key directly. Its length determines how high the key must lift that stack.

The pattern of depths cut into a key blade that positions each pin stack at the shear line. Each depth corresponds to a numbered cut, commonly from 0 to 9.

A fixed obstruction inside a lock or keyway that only permits a correctly shaped key to pass. Warded locks use wards instead of pins to provide minimal security.

The shaped slot in a lock plug or cylinder that accepts the key blade. Its profile, called the keyway section, restricts which key blanks will enter.

A system in which two or more keys operate the same lock at different authority levels. It relies on extra pins or split pins that allow a change key and a master key to both work.

The lowest-level key in a master key system, operating only its own individual lock. It will not operate other locks or higher-level master keys in the system.

A key that operates a group of locks in a master key system in addition to each lock's own change key. Higher-level masters may operate progressively larger groups.

The highest-level key in a multi-level master key system, operating all locks under it, including those controlled by subordinate masters. It sits above master keys in the hierarchy.

A lock mechanism using spring-loaded pin stacks that must be raised to the shear line by a key before the plug turns. It is the most common cylinder type in North America.

Changing a lock's keying by replacing key pins so that a new key operates it and old keys no longer do. It is commonly done after a move or a lost key.

A non-destructive locksmithing technique of making a working key by marking and filing a blank against the lock's internal components. It is used when a key is lost and no code is available.

A number or alphanumeric sequence assigned by a lock manufacturer that corresponds to a specific bitting. Locksmiths use code books or software to cut a key from the code.

A device that duplicates or originates a key by tracing a pattern or following code settings to cut a blank. It may be mechanical, semi-automatic, or computer-controlled.

An automotive key containing a small electronic chip that communicates with the vehicle's immobilizer. The vehicle will not start unless the chip is recognized and programmed.

An electronic anti-theft system in a vehicle that disables the engine unless a correctly coded key or fob is present. It reads a transponder chip or passive signal before allowing starting.

Adding or programming a key or remote to a vehicle through the on-board diagnostics port using a scan tool. It is a common method for registering new transponder keys.

A unique 17-character code assigned to each vehicle that identifies make, model, year, and production details. Locksmiths use it to look up key codes and key specifications.

A key cut with angled or side cuts and often a restricted keyway, designed to resist picking and unauthorized duplication. It usually requires authorization to copy.

A keyway design that limits blank availability so only authorized persons can obtain copies. It protects the integrity of a key system by controlling duplication.

A dial or electronic lock on a safe that requires a correct sequence of numbers or codes to open. Mechanical versions use wheels and a fence; electronic versions use a keypad and motor.

A spring-loaded bolt inside a safe that fires and jams the boltwork if the lock is attacked or removed. It prevents opening even after the lock is defeated.

The assembly of bolts, linkages, and levers that secures a safe door to its frame. It is driven by the lock or handle and must retract to open the door.

The graduated ring around a safe's combination dial that provides reference marks for aligning numbers. Its index mark is used to dial the combination accurately.

A container tested and rated to protect contents from heat and fire for a specified time. Ratings are expressed in hours and temperature limits under standard test conditions.

A safe tested and classified by its resistance to forced entry using tools and time. Ratings such as TL-15 or TL-30 indicate the tool class and minutes of resistance.

The removable lock unit containing the plug and pin chambers that a key operates. It is often installed in a knob, lever, or mortise lock body.

A lock body installed into a rectangular pocket cut into the edge of a door. It typically contains a latch bolt, a deadbolt, and often a cylinder.

A lock bolt that extends and retracts only by turning a key or thumbturn, with no spring latch action. It provides stronger resistance to forced entry than a spring latch.

The metal plate on the door frame that receives the latch or deadbolt when the door closes. Its alignment and strength affect both security and smooth operation.

An electronic door frame device that releases the latch when powered or signaled, allowing access control. It may be fail-secure or fail-safe depending on wiring.

An electronic system that grants or denies entry based on credentials such as cards, codes, or biometrics. It typically controls an electric strike or magnetic lock.

A lock or access device that unlocks when power is lost, allowing free egress. It is common on life-safety doors where exit must always be possible.

A lock or access device that remains locked when power is lost. It prioritizes security over free passage and is used where egress is not a life-safety concern.

Coverage that protects a locksmith business against claims of injury or property damage arising from work performed. It is a common requirement for commercial clients and contracts.

A legal claim against property for unpaid work or materials, such as an unpaid locksmith bill. Procedures and rights vary by jurisdiction and must be followed carefully.