North Carolina Locksmith Practice Exam

Question: 1 / 435

What type of deadbolt can be operated by a key from both sides?

Single Cylinder Deadlock

Double Cylinder Deadlock

The correct choice is the double cylinder deadlock. This type of deadbolt can be operated by a key from both sides, which enhances security by preventing unauthorized access through a door that has glass panels or windows nearby, as a person cannot simply reach in to unlock it from the inside.

In contrast, a single cylinder deadlock typically allows for key operation from the outside, but has a thumb turn on the inside, which can be easily manipulated without a key. Chain locks and deadlatches also do not provide a key-operated function from both sides, as they are designed for different purposes and mechanisms, primarily focusing on convenience or additional security features rather than the dual-key operation that characterizes the double cylinder deadlock.

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Chain Lock

Deadlatch

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