North Carolina Locksmith Practice Exam 2026 – 400 Free Practice Questions to Pass the Exam

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What does a "key profile" refer to in locksmithing?

The external shape of a key

The series of cuts and grooves on a key

The term "key profile" in locksmithing refers specifically to the series of cuts and grooves on a key. These cuts and grooves are what define the unique shape and functionality of the key, allowing it to operate a specific lock. Each key profile is designed to match the internal components of a corresponding lock cylinder, guiding the key into the lock and interacting with the pins or tumblers to unlock it.

A key profile is crucial because it ensures that a key can fit into the lock it is intended to operate. This differentiation is essential for maintaining security, as different locks require different profiles; thus, keys with the same external shape (or "bit profile") but different cuts will not work interchangeably. Understanding key profiles is fundamental for locksmiths as they work to create or duplicate keys that must align perfectly with the intended lock's mechanism.

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A designation for key types by manufacturers

The theoretical design of a key

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