CRL flashcards
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20 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Keyway
- The shaped opening and associated profile admitting a compatible key blade, distinguished from the key cutting pattern that operates the mechanism.
- Key blank
- An uncut or partly prepared key form whose profile, dimensions and locating reference must match the intended cylinder or mechanism.
- Shoulder stop
- A locating feature used by a shoulder-stopped key to establish insertion position, distinguished from a tip reference on another key type.
- Tip stop
- A locating arrangement using the key tip as the relevant insertion or cutting reference, rather than assuming every key stops at a shoulder.
- Bitting
- The sequence or pattern of operating cuts on a key under the relevant system, distinct from the keyway profile and from universal interchangeability.
- Shear line
- The relevant boundary permitting movement in a specified tumbler mechanism when the operating components are aligned as designed.
- Cylinder
- The lock component containing the relevant key-operated mechanism, whose replacement or rekeying does not automatically change every other access-control function.
- Plug
- The rotating portion of an appropriate cylinder mechanism, distinguished from the surrounding housing and the complete door lockset.
- Master key
- An authorized key designed to operate a defined group of locks in a keying system, with scope established by that system design.
- Change key
- A key intended to operate its assigned lock or defined limited group under the keying arrangement, distinguished from a higher-level master key.
- Master pin
- An additional pin segment used in an appropriate pin-tumbler master-key arrangement to create additional operating interfaces under the specified design.
- Adjacent-cut limit
- A manufacturer-specific constraint on the difference between neighboring cut depths, reducing the usable set below a simple theoretical combination count.
- Lockset function
- The intended relationship between locking, unlocking and lever or knob operation on each side, distinct from appearance or brand name.
- Egress
- Movement toward an exit through the relevant route, whose permitted door operation must be distinguished from authorization to enter from outside.
- Fail-secure
- A defined device behavior remaining secure on its controlled side when power is lost, which does not alone describe every egress function.
- Fail-safe
- A defined device behavior releasing its controlled locking function when power is lost, requiring evaluation within the complete approved door arrangement.
- Door closer
- Hardware controlling door closing under its design and adjustment limits, whose behavior interacts with hinges, latch, seals and air pressure.
- Electric strike
- An electrically controlled strike component interacting with a compatible latch, with operation and approval depending on the complete door assembly.
- Key control
- The organized authorization, issue, recordkeeping and recovery of keys or relevant duplicates, rather than merely keeping spare keys in one drawer.
- Service authorization
- Evidence that the requester may authorize the agreed work on the specified property, which should be established before access or modification.