Mortise Lock

A mortise lock is a lock that requires a pocket—the mortise—to be cut into the edge of the door or piece of furniture into which the lock is to be fitted. Mortise lock describes only a method of fitting the lock, and says nothing about the quality or key mechanism.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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The lock-grade and safe-rating figures throughout this site are drawn directly from the published ANSI/BHMA A156 and UL 72/687 standards — see the ratings reference. Calculators run real math, not AI estimates; guides and articles are written and edited in-house.