Key Systems & Key Control Flashcards

In a master key system, what term describes a key that operates all locks within a single department or zone?

Answer: Sub-master key

A sub-master key operates all locks within a specific department or zone, sitting between the change key and master key in the hierarchy.

What is the primary purpose of a key control log in a commercial facility?

Answer: To track who has been issued which keys and when

A key control log tracks key issuance, returns, and accountability to maintain security and audit trails.

Which key system feature prevents unauthorized key duplication at a hardware store?

Answer: Patent-protected keyway restrictions

Patent-protected keyways are restricted by law, preventing blanks from being sold to non-authorized dealers.

A 'do not duplicate' stamp on a key is considered:

Answer: An honor system with no legal force

'Do not duplicate' markings are not legally enforceable and any locksmith or hardware store may still copy the key.

In a large master key system, what is a 'grand master key' (GMK)?

Answer: A key that operates all locks across all groups in the system

A grand master key operates every lock in the entire system, sitting at the top of the key hierarchy.

What is 'key bitting'?

Answer: The specific cut depths and spacing on a key blade

Key bitting refers to the precise cut depths and positions on a key blade that correspond to pin heights in the cylinder.

When expanding an existing master key system, what is the main risk to avoid?

Answer: Cross-keying, where unintended keys operate locks

Cross-keying occurs when a key unintentionally operates a lock it was not designed for, compromising security.