Oklahoma Locksmith Practice Exam

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What is the standard residential backset dimension?

2 1/2"
2 3/8"
3"
3 1/4"

The correct answer is: 2 3/8"

The standard residential backset dimension is 2 3/8 inches. This measurement refers to the distance from the edge of the door to the center of the borehole where the lock is installed. Most residential doors in the United States are designed to accommodate this standard dimension, making it the most common size found in homes. Understanding the standard backset is crucial for locksmiths when installing or replacing locks, as using the correct backset ensures proper alignment and functionality of the locking mechanism. This facilitates a smooth operation of the door and maintains security standards. While other measurements do exist, they are typically less common for residential applications.