The ANSI/BHMA (American National Standards Institute/Builders Hardware Manufacturers Association) grading system is the most common rating used to provide consumers with quality assurance. These organizations put consumer locks through a series of tests to determine operational function, pull strength, key torque cycles, and impact resistance. Look for locks with an ANSI/BHMA Grade 1 or Grade 2 for the best security. These industry standards ensure your locks work for years to come. Depending on the lock, you might see a letter rating instead—like AAA. The letters cover three categories: durability, strength/security, and finish. Grade A is the highest rating in a given category, and Grade C is the lowest.