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

Question: 1 / 435

What does the 'plug' in a cylinder do?

Houses the keyway and tumbler chambers

The term 'plug' refers to a critical component of a cylinder lock. In this context, the plug is the part that houses the keyway and the tumbler chambers. When a key is inserted into the plug, it aligns the pins inside the tumbler chambers, allowing the cylinder to turn and engage or disengage the locking mechanism. This intricate function is central to the operation of most pin tumbler locks, facilitating the secure opening and closing of doors.

Understanding the role of the plug is essential for locksmiths, as it directly relates to the design and functionality of a lock. By housing the keyway, the plug allows for the controlled access that the lock system is designed to provide, ensuring that only the correct key can manipulate the internal components to lock or unlock the door.

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Secures the door in place

Connects the latch to the locking mechanism

Transitions between a key and a lock

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