Associated Locksmiths of America (ALOA) Practice Test 2025 – Your Comprehensive All-in-One Guide to Exam Excellence!

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What is the diameter of a standard pin tumbler used in residential and commercial lock applications?

.115

.120

The diameter of a standard pin tumbler used in both residential and commercial lock applications is typically .120 inches. This size is commonly utilized because it provides the right balance of security and compatibility with standard lock designs. The pin tumbler mechanism relies on these pins to align at a specific shear line when the correct key is inserted, allowing the lock to turn and operate.

A diameter of .120 inches is considered standard across many types of locks, ensuring uniformity in manufacturing and components. This standardization allows locksmiths and manufacturers to efficiently produce and service locks using compatible parts.

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.100

.130

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