North Carolina Locksmith Practice Exam 2025 - Free Locksmith Practice Questions and Study Guide

Question: 1 / 435

What does "Effective Plug Diameter" refer to?

The actual diameter of the key

The combined length of a key cut and its corresponding bottom pin

"Effective Plug Diameter" refers to the combined length of a key cut and its corresponding bottom pin. This concept is crucial in locksmithing because it determines the interaction between the key and the pins within the lock cylinder. The effective plug diameter is not simply about the physical size of components, but rather how the dimensions of the key cuts and the pins work together to ensure proper locking and unlocking mechanisms.

In locks, each key cut height corresponds to a specific pin length, and the effective plug diameter is essential for ensuring that when the key is inserted, the pins align correctly with the shear line, allowing the lock to operate smoothly. This understanding is vital for locksmiths to create or duplicate keys that will function accurately in the intended lock, making it an important concept in unlocking potential in the field.

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The size of the plug in the lock cylinder

The outer dimension of the lock cylinder housing

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