Associated Locksmiths of America (ALOA) Practice Test 2025 - Free Locksmith Practice Questions and Study Guide

The required height of the pin stack in an IC (Interchangeable Core) cylinder is critical for ensuring the proper operation of the locking mechanism. The correct height of 23, when measured in thousandths of an inch, is standardized to accommodate the varying lengths of pins that can be used within the cylinder. This height ensures there is adequate space for all pins to function effectively, allowing for smooth operation of the lock and compatibility with the keying system.

When the pin stack is set to this specified dimension, it allows for the most efficient engagement of the key with the pins, facilitating the smooth pulling of the core from the cylinder when the correct key is inserted. Any deviation from this required height can lead to malfunctions, such as the inability to turn the key or the core sticking, which can compromise security.

The other height measurements listed do not align with industry standards for IC cylinders, leading to potential operational issues within the locking mechanism.