Associated Locksmiths of America (ALOA) Practice Test 2026 – Your Comprehensive All-in-One Guide to Exam Excellence!

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What is the stack value and pin increments for an A3 core system?

14 stack and 0.021 increments

16 stack and 0.018 increments

The A3 core system is a cylinder used in various locking mechanisms that feature a specific design for stack value and pin increments. The correct stack value of 16 represents the number of pins within the core that can be accommodated, enabling a variety of key combinations and enhancing security. The pin increment of 0.018 indicates how much each pin can move within the cylinder to allow for precise alignment with the key cuts; this ensures that each unique key can effectively engage the pins to operate the lock.

The combination of a 16 stack and a 0.018 increment is essential for maintaining the proper function of the locking mechanism, allowing for reliable locking and unlocking actions. This setup impacts how keys are manufactured and how easily they can be duplicated, which is vital information for locksmiths when working with different lock systems.

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12 stack and 0.025 increments

18 stack and 0.015 increments

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