Published 2026-03-01 · First Coast Lock

ANSI Grade 1 vs Grade 2 Deadbolts: What the Numbers Mean

What ANSI/BHMA grades actually measure

ANSI/BHMA A156.36 is the standard that governs auxiliary locks (which is what deadbolts are, technically). Locks are tested in a real lab against three criteria, and they have to pass all three to earn the grade. The criteria are operational cycles (how many open-close uses before the lock starts to fail), strike impact (how many sledgehammer-style hits the lock survives without opening), and surreptitious entry (whether the cylinder can be picked or bumped or shimmed open quickly).

Grade 1 is the highest. To earn it, a deadbolt must survive 250,000 open-close cycles (about 30 years of normal residential use), 10 impacts from a 75-pound test weight at 24 inches, and 75 inch-pounds of torque applied to the cylinder. Grade 2 cuts those numbers to 400,000 cycles, 5 impacts, and 50 inch-pounds (it has a higher cycle count but lower impact resistance, because Grade 2 is designed for higher-frequency residential use). Grade 3 is the lowest grade that ANSI/BHMA recognizes: 200,000 cycles, 2 impacts, and 25 inch-pounds. Below Grade 3, the lock is unrated and probably should not be used on an exterior door at all.

What the testing looks like in practice

The cycle test is the boring part. A robot turns the lock open and closed at a set speed until the lock fails or hits the cycle target. Failure means the bolt no longer throws cleanly, the cylinder seizes, or the latch retraction stops working. Grade 1 has to hit 250,000 cycles. Most Grade 1 commercial deadbolts in actual use exceed a million cycles in the field, because the test is conservative.

The impact test is the interesting part. The lock is mounted in a test door, locked closed, and a calibrated weight is dropped from a fixed height onto the lock face. The weight transfers the impact through the bolt and into the strike, mimicking a sledgehammer attack on the exterior of the door. Grade 1 takes 10 hits without opening. Grade 2 takes 5. Grade 3 takes 2. After the test, the door is opened and inspected for cylinder damage or bolt deformation.

The surreptitious-entry test rates how long the lock resists picking and bumping by a trained technician. Grade 1 cylinders are usually high-security keyways or proprietary patented cylinders that resist standard picking tools. Grade 2 cylinders are usually standard pin-tumbler with anti-bump pins. Grade 3 cylinders are basic pin-tumbler with no anti-bump features, which is why they fall in 30 seconds to a $5 bump key. This is the test where the gap between grades is widest.

Side-by-side: the three grades

Test	Grade 1 (commercial)	Grade 2 (residential)	Grade 3 (builder)
Open-close cycles	250,000 minimum	400,000 minimum	200,000 minimum
Strike impacts at 75 lbs	10 hits	5 hits	2 hits
Torque resistance	75 in-lbs	50 in-lbs	25 in-lbs
Typical hardware cost	$60-$150	$30-$60	$15-$30
Field lifespan (Jacksonville)	20-30 years	10-15 years	7-10 years
Common keyway	High-security or restricted	Standard pin-tumbler with anti-bump	Basic pin-tumbler, easy to bump
Common Jacksonville install	Commercial doors, security-conscious homes	Most residential upgrades	Builder-grade move-in stock

Which grade for which Jacksonville door

For an exterior front door on a Duval County single-family home, our default recommendation is Grade 1. The cost difference over a 25-year lock life is roughly $5 per year. The Grade 1 cylinder defeats casual bumping and picking, and the bolt-and-frame engagement survives more impact attempts than the lower grades. The most popular Grade 1 residential deadbolt we install is the Schlage B660 series, with the B560 (Grade 2) as the value option.

For interior doors, garage entry doors, and lower-traffic side or back doors, Grade 2 is the right answer. The Schlage B200 or the Kwikset 660 Smartkey both qualify. Smart-lock options at Grade 2 include the Schlage Encode, the Yale Assure series, and most August retrofits installed over an existing Grade 2 cylinder.

For interior pass-through doors where the deadbolt is only there for privacy (not security), Grade 3 is acceptable. The lock is doing storage-room duty, not security duty, and the cheaper hardware is fine.

Grade is not the whole story

A Grade 1 deadbolt installed on a builder-grade strike plate with half-inch screws into the trim is still defeated by a kick. The grade rates the lock, not the install. We see this on Jacksonville home inspections all the time: expensive Schlage Primus locks ($200 plus install), screwed into pine trim with stock 3/4-inch screws. The lock is fine. The kick still pops the door because the strike plate is held by the trim, not by the framing.

The full security upgrade is the lock plus the strike plate plus the jamb reinforcement. A Grade 2 deadbolt with a heavy-gauge strike held by 3-inch screws into the studs is more secure in real-world burglary defense than a Grade 1 deadbolt on a stock strike. See our deadbolt vs smart lock guide for the full strike-and-jamb conversation, and our lock change page for the full Jacksonville pricing on swap-in installs.

How to tell what you have on your Jacksonville door

Pull the deadbolt cover and look for the brand and model number stamped on the lock body. Then check the manufacturer's site for the grade. If you bought the home recently, look in your closing folder for the builder hardware schedule, which lists each lock model. If neither option works, a Jacksonville locksmith can identify the brand and grade on a service call in five minutes and tell you whether an upgrade is worth doing for your specific door.

Frequently asked

Need a deadbolt upgrade in Jacksonville?

Call (904) 454-8942 for an in-home consult on deadbolt grading, strike-plate upgrades, and jamb reinforcement. We quote the full hardware package before the truck rolls, and we provide an itemized grade-and-brand receipt for homeowner-insurance documentation.

Last updated: 2026-03-01.