ALOA CML flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Shear line

The boundary between the plug and the bible in a pin tumbler lock. The correct key raises all pin stacks so their breaks align exactly at this line, allowing the plug to rotate.

Pin stack height

The combined length of the key pin plus driver pin (plus spring allowance). It must fit within the bible bore when the correct key is inserted and clear the shear line properly.

Master pin length

In a master-keyed pin stack, the master pin occupies the difference between the shallow change-key depth and the deep master-key depth, letting two different keys reach the shear line.

Bottom-of-keyway tension

Tension applied to the lower ledge of the plug's keyway. It is common but can reduce pick clearance; top-of-keyway tension often gives more room on tight keyways.

Warded lock

A lock using fixed internal wards that block all but a key with matching slots. It provides minimal security and is opened by a key passing the ward pattern.

Lever tumbler gate

A notch in each lever that the fence must enter. All lever gates must align for the bolt to throw; lever count determines the theoretical number of key differs.

Key bitting depth increment

The spacing between adjacent cut depths on a key, typically about 0.015 to 0.025 inch depending on the manufacturer's specification for that keyway series.

Mortise lock handing

Determined by the latch bevel and body orientation. Handing is changed by reversing the latch, not by swapping the lock body, so the door closes and latches correctly.

Backset

The distance from the door edge or face plate to the center of the cylinder or spindle hole. Common residential backsets are 2-3/8 and 2-3/4 inches.

Fail-safe electric strike

A strike that is unlocked when unpowered and locks only when powered. It is typically used where life-safety egress requires release on power loss.

Fail-secure electric strike

A strike that remains locked when unpowered and releases only when powered. It must be evaluated against egress and fire-code requirements before installation.

Request-to-exit (REX)

A sensor or button that signals the access system to release the lock for egress. It is required for code-compliant free egress on many electrified openings.

Anti-shim deadlatch

A plunger on the latch that prevents the latch from being slipped back with a card when the door is closed. Correct strike alignment keeps the plunger functioning.

Door closer backcheck

A valve setting that controls resistance as the door opens, protecting the door and wall. It is adjusted separately from sweep and latch speed valves.

Electronic lock audit trail

A firmware-maintained log of lock events such as key use and programming changes. Logs usually hold a fixed number of entries and overwrite the oldest first.

Transponder key programming

Registering the key's chip with the vehicle immobilizer so the engine will start. Cutting the blade alone does not satisfy the immobilizer on most modern vehicles.

All-keys-lost procedure

The workflow when no working key exists. It may require security access codes, an OBD programmer, or bench reading of the immobilizer module, varying by make, model, and year.

VATS resistor pellet

A resistor embedded in older GM keys. Its measured resistance must fall within the vehicle's stored value range before the starter circuit is enabled.

Transponder cloning

Copying an existing chip's data onto a clone chip so it matches the original. Unlike adding a key, cloning does not register a new key slot in vehicle memory.

Remote head key

A key combining a mechanical blade, transponder chip, and remote keyless entry transmitter. Programming usually does the immobilizer first, then remote synchronization.

Key code to bitting

The process of converting a manufacturer key code into cut depths using a codebook or key machine software, then test-fitting the cut key before programming.

TL-15 safe rating

A burglary rating indicating the container resisted a defined tool attack for at least 15 minutes in testing. Higher TL numbers indicate longer tested resistance.

Group 2 combination lock

A common three-number dial combination lock using a drive cam. It has looser tolerances and less manipulation resistance than Group 1 or Group 1R locks.

Combination dialing sequence

The ordered dial turns for a combination: to the first number in the set direction, past the second the required number of times, land the third, then open.

Safe relocker

A spring-loaded bolt that fires during attack, such as thermal or punch attempts, to keep the safe locked. A fired relocker often requires drilling and servicing to reset.

Safe fire rating

A certification limiting internal temperature for a stated time, such as 350°F for one hour, to protect documents or media. It is independent of burglary ratings.

Dial manipulation

A technique of reading wheel-pack contact points through the dial to derive a combination without drilling. Group 1 locks are designed to resist it better.

Proof of authorization

Verification that a customer has the right to access a vehicle or building, such as registration, ID, work order, or property-manager approval, obtained before work begins.

Locksmith licensing and bonding

Many jurisdictions require a locksmith license, surety bond, and insurance. Working outside those requirements can void coverage and create legal exposure.

Itemized estimate

A written breakdown of labor, parts, trip charges, and emergency premiums given before work. Customer approval is obtained before non-emergency add-on work.

Master key chart custody

The master key chart and restricted-keyway authorization are sensitive customer property. The locksmith delivers them to the owner and keeps no unauthorized copies.

Job record retention

Keeping authorization, work performed, and parts used for each job per local retention rules. These records support warranty claims and defense against liability claims.