Picking a Deadbolt Lock: What to Look For

A deadbolt only protects your home if it is built to a tested standard, sized to your door, and anchored into the frame. Skip any one and a lock that looks sturdy can still fail under a good kick. This guide covers the rating to check, the door measurements that decide fit, and the install details that separate a real upgrade from a cosmetic one.

Which Deadbolt Rating Actually Matters?

The BHMA Certified Secure Home label, tied to the ANSI/BHMA A156.40 residential deadbolt standard, is the rating system to check first.

Deadbolts and locksets earn A, B, or C category ratings, with Best/A at the top tier and Good/C at the entry level. You want the label itself, not just a marketing claim.

• Best (A) — the highest tested tier for security and durability.
• Better (B) — a solid middle rating.
• Good (C) — the baseline tier, the lowest of the three.

A box or product page that never states its grade is a red flag. Check the spec sheet or the lock body for the marking before you buy. For a side-by-side look at models that disclose their grades, see our tested roundup of deadbolt locks for home security.

One caveat: BHMA certification is a performance standard, not a promise against every attack. A top-rated lock bolted to a weak frame still loses.

How Do You Match a Deadbolt to Your Door?

Three measurements decide fit: door thickness, backset, and bore prep.

Most residential deadbolts are built for a standard thickness range listed in the instructions — the Schlage B60/B62 manual has you verify thickness before mounting. An unusually thick or thin door rules a lock in or out.

Backset is the distance from the door’s edge to the center of the bore hole, commonly 2-3/8 or 2-3/4 inches. A lock made for one will not drop into a door prepped for the other without an adapter or new hole.

Bore prep is the third. If your door already has a deadbolt hole, matching the new lock’s bore size saves drilling. For a fresh hole, follow the included template — an off-center bore means the bolt drags or misses the strike.

What Separates a Real Install From a Cosmetic One?

The strike plate and screws matter as much as the lock body. The Schlage B60/B62 instructions walk through installing the latch and bolt, mounting the exterior and interior assemblies, securing all fasteners, then testing the lock from outside — each step affects whether the bolt lines up with the frame.

Most guides call for a reinforced strike plate and longer screws that reach into the wall framing, not just the jamb trim. Short screws into soft trim can pull free under force even with a high-rated bolt. Check that the bolt extends fully into the strike plate when locked.

Finish and hardware size are the last details. A bolt that only partially seats, or a plate that shifts, undermines the whole assembly.

What Else Should You Check Before Buying?

Decide your lock type first, because it changes everything downstream. Single-cylinder locks key from outside and turn from inside; double-cylinder locks key from both sides; smart models add keypads, Bluetooth, Wi-Fi, or RFID. Each type has trade-offs, and compatibility gets more complicated with smart locks.

For smart deadbolts, verify the exact model’s connectivity and access method before purchase — published examples include Bluetooth and Wi-Fi, RFID, keypad passcodes, and Touch-to-Lock. Model-specific code compliance and fire ratings vary, and applicability can extend to commercial openings, so the spec sheet matters more than the feature list.

Confirm the lock is rated for interior versus exterior use, and re-check the fit measurements. Matching the deadbolt to the door and frame construction is what makes the rating mean something. A great lock on a weak frame is still a weak door.