A good door lock is only as strong as the door, the frame and the strike plate around it. Most forced entries happen when the door frame splits, not when the lock fails. This guide explains lock grades, smart lock choices and the upgrades that make a real difference. Disclosure: This article contains affiliate links. As an Amazon Associate I earn from qualifying purchases, at no extra cost to you. Understand lock grades In the United States, residential locks are rated by ANSI/BHMA grades. Grade 1 is the most durable, Grade 2 is a solid residential level, and Grade 3 is basic. For an exterior door, choose Grade 1 or Grade 2 where possible. The package or manufacturer's site shows the grade. Use a deadbolt A deadbolt extends a solid metal bolt into the frame and cannot be pushed back by a card or thin tool the way a spring latch can. Choose a bolt that extends at least one inch into the frame. Schlage single-cylinder deadbolt is a widely used keyed deadbolt with a high residential ...
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