Buying Guide
Standards
Grade 1 vs 2 vs 3
The Number on Your Lock Actually Means Something
ANSI Grade 1, 2, and 3 aren't marketing tiers. They're the results of real laboratory tests — a million door cycles, 10 kicks from a battering ram, 360 pounds of lateral force. Here's exactly what each grade proves, and which one your front door actually needs.
By the NPZ Team
·
Buying Guides
·
March 2026
·
11 Min Read
Walk into any hardware store and flip a deadbolt box over. Somewhere in the fine print you'll find it: ANSI/BHMA Grade 1. Or Grade 2. Or, if you're looking at the $19 unit near the floor, Grade 3. Most people read it the same way they read a nutrition label — technically informative, practically ignored. That's a mistake.
Those grades aren't assigned by the manufacturer. They're awarded by an independent testing laboratory after a lock survives a very specific series of attacks, torque loads, cycle counts, and impact blows. A Grade 1 lock has literally been through more than a million open-and-close cycles under load before it earned that designation. A Grade 3 lock survived a quarter of that. The difference isn't cosmetic.
The system is run by two organizations most people have never heard of: ANSI (the American National Standards Institute), which provides oversight and accreditation, and BHMA (Builders Hardware Manufacturers Association), which actually writes the tests. BHMA is the only organization accredited by ANSI to develop and maintain performance standards for locks and door hardware in North America — they've been at it since 1983, and the A156 series of standards they publish is the benchmark the entire industry uses.
This guide breaks down what each grade actually requires, which tests are involved, and — most importantly — which grade you need for which door. No fluff. Just the numbers.
Before we get into each grade, one thing worth understanding: the A156 series covers many different lock types. A156.2 covers cylindrical locks (your typical knob or lever lockset). A156.5 covers deadbolts. A156.13 covers mortise locks. The cycle counts and specific test values can vary between standards, but the grade tiers — 1 being the toughest, 3 being the baseline — are consistent across all of them.
Grade 1 is the standard that earns the word commercial. To get there, a cylindrical lockset has to survive one million open-and-close cycles — each one under a 10-pound axial load pushing against the door, simulating real-world use. That's not a marketing claim. That's the test. After a million cycles, the lock still has to operate within specification: the latch must retract with no more than 28 inch-pounds of torque, close against a door with no more than 4.5 pounds of force.
The durability test is only the beginning. Grade 1 locks then face a locked-lever torque test: 1,200 inch-pounds of rotational force applied to the lever while it's locked. That's roughly 100 foot-pounds — more than most people can generate by hand. The lock body, the trim, the cylinder housing — none of it can fail or dislodge. Then comes the lever strength test: 360 pounds of horizontal force applied to the lever. This one is shared with Grade 2 and Grade 3, but it's worth noting: all ANSI-graded locks can handle your weight on the lever. The difference is everything else around it.
After a million cycles, the lock still has to function within spec. Grade 1 doesn't just survive — it has to still work properly at the end.
The security test is where Grade 1 really separates itself. A 75 foot-pound ram — a weighted pendulum simulating a kick or shoulder strike — hits the face of the cylinder ten times. Grade 1 must survive all ten without losing function. The lock can show damage, but the door must remain secure. Grade 2 only needs to survive five blows. Grade 3, just two.
What Grade 1 Looks Like in the Real World
Grade 1 hardware is standard in schools, hospitals, government facilities, hotels, and any high-traffic commercial space. The Schlage L-Series mortise lock — the type you'll find on most commercial office buildings — is Grade 1 certified for both operational and security tests. The Schlage ND Series cylindrical trim is Grade 1, and it's what you'll find on the doors of most public buildings you walk through every day.
✓ Is Grade 1 right for your home?
It's overkill for interior doors, but a reasonable choice for your main entry — especially if you're going with a cylindrical deadbolt. Grade 1 deadbolts (like the Schlage B60N or Medeco Maxum) don't cost dramatically more than Grade 2 at the consumer level, and they're tested to a meaningfully higher standard. If you're replacing one lock and want it to last, Grade 1 is the answer.
Grade 2 is what most people mean when they say "a good lock." It's the tier that covers the gap between institutional-grade hardware and bare-minimum residential — and it's where the majority of quality consumer deadbolts are certified.
Under A156.2, a Grade 2 cylindrical lockset must survive 500,000 cycles. Mortise locks get tested to a higher cycle count — 800,000 — because they're built for heavier use by design. Both have to meet the same operational force requirements as Grade 1: latch retraction under 28 inch-pounds, closing force under 4.5 pounds. What changes is the abuse resistance.
The locked-lever torque test for Grade 2 drops from 1,200 in-lbf to a lower threshold. The security (ram) test requires surviving five blows at 75 foot-pounds instead of ten. That sounds like a big drop, but it's worth keeping in perspective: five 75 foot-pound blows is still more force than most residential break-in attempts involve. Kicked-in doors typically fail at the frame, not the lock. The bolt still matters, but the door frame matters more.
⚡ Grade 2 Brand Examples
- Schlage ALX Series — Grade 2 cylindrical lever locks, widely used in apartments and light commercial settings
- Kwikset SmartKey deadbolts — most models are Grade 2, with the added benefit of user-rekeyable cylinders
- Schlage B-Series (B62N) — a Grade 2 deadbolt; solid residential choice at a mid-range price
- Master Lock heavy-duty padlocks — select models carry Grade 2 ratings with hardened shackles
For most homeowners, a Grade 2 deadbolt properly installed in a reinforced frame is the practical upper limit of what the rest of the door can support anyway. A Grade 1 bolt doesn't help if the strike plate is held in with half-inch screws.
Grade 3 has a reputation problem. People see it as the "bad" grade, the one you avoid. That's not quite right. Grade 3 locks still go through actual laboratory testing — they're just tested to a lower threshold, appropriate for the use they're designed for.
A Grade 3 cylindrical lockset must survive 250,000 cycles. For a front door used ten times a day, that's roughly 68 years of operation — which is already longer than most locks stay installed. The security test requires surviving only two blows at 75 foot-pounds. That's meaningfully less than Grade 1 or 2, but it's still a measurable standard, not nothing.
The practical issue with Grade 3 hardware on a main entry isn't that it fails tests — it's that it offers less margin against determined attack, and it's often bundled with cylinders that are easier to pick or bump. The lock mechanism may be Grade 3 certified while the cylinder inside it is three-pin with no security pins. Those are separate things. The ANSI grade covers the lockset's physical durability and basic attack resistance; it doesn't grade the cylinder's resistance to picking or bumping.
⚠ Where Grade 3 Belongs — And Where It Doesn't
Grade 3 is fine for: interior bedroom and bathroom locks, closet and storage room doors, secondary exterior doors in low-risk areas, and rental units where cost is the primary constraint. It is not ideal for: main entry deadbolts, exterior garage doors, or any door you'd be upset about someone kicking in. The tests just don't cover that level of abuse.
For context: Yale's standard residential knob lock lines — the Tulip, the Carolina — are Grade 3 hardware. These are sold in enormous quantities for interior passage use, and they're perfectly appropriate for that. The problem only arises when a builder or a distracted homeowner installs Grade 3 hardware on a front entry and calls it secure.
Advertisement · 728 × 90
ANSI/BHMA testing is done by independent, accredited laboratories. A lock manufacturer submits a production sample — not a handpicked prototype, a unit pulled from regular stock — and the lab runs it through a standardized battery. Here's what that actually involves:
1. Cycle Testing
The lockset is mounted on a test door frame, and a motor automatically operates it — turning the lever, retracting the latch, engaging and releasing — over and over, under a constant axial load (typically 10 lbs for cylindrical locks). The machine counts cycles. Grade 1 needs a million. Grade 2 needs 500,000. Grade 3 needs 250,000. At the end, the lock is measured against its original operational specs. It has to still work within tolerance.
2. Operational Force Testing
This is the ADA compliance check. Latch retraction torque must not exceed 28 inch-pounds — light enough for someone with limited hand strength to operate. The latch must close against a door frame (from 15° open) with no more than 4.5 pounds of force. These numbers don't change between grades. All three must pass them.
3. Strength and Torque Testing
📐 Key Strength Tests by Grade
1
Lever strength (all grades): 360 lbs applied horizontally to the lever. The lock must not fail, deform, or become inoperable. This simulates someone grabbing and yanking the lever as hard as possible.
2
Locked-lever torque (Grade 1): 1,200 inch-pounds of torque applied to the lever while the lock is in the locked position. The cylinder, trim, and housing must not dislodge or rotate. Grade 2 and 3 are tested at lower values.
3
Deadbolt bolt strength: For deadbolts, a 250 lb force is applied to the bolt in the extended position. The bolt must not retract, shear, or deform beyond spec.
4
Rose/escutcheon impact: A pointed striker hits the trim rose. Grade 1 uses slightly heavier metal than Grade 2/3 and must resist deformation that would allow the rose to be removed and the cylinder accessed.
4. Security (Impact) Testing
A pendulum ram — a weighted swing arm that delivers a measured blow to the face of the lock cylinder — hits the lock repeatedly. Each blow is calibrated to 75 foot-pounds of impact force. Grade 1 must survive 10 blows. Grade 2 must survive 5. Grade 3 must survive 2. After the test, the door must remain closed and locked. The lock can look destroyed on the outside — the cylinder can be pushed in, the trim can crack — but the bolt must stay engaged.
5. Material and Finish Testing
All grades share the same finish requirements. Salt spray exposure (ASTM B117), UV resistance, abrasion cycles — the hardware has to maintain its appearance and corrosion resistance across the same spectrum regardless of grade. A Grade 3 lock won't rust faster than a Grade 1, assuming they carry the same finish rating.
1. "Grade 3 Means the Lock is Unsafe"
Not inherently. Grade 3 means the lock passed the baseline test suite. For an interior bedroom door, a closet, or a low-traffic secondary entrance, Grade 3 is entirely appropriate hardware. The issue is misapplication — a Grade 3 deadbolt on a main entry is asking a lock that survived 250,000 cycles and 2 ram blows to perform in a context that arguably warrants Grade 1 or 2. The lock isn't bad; it's in the wrong place.
2. "Grade Alone Determines How Secure a Lock Is"
This is the bigger misconception, and it matters. ANSI grade tests for physical durability, operational smoothness, and basic impact resistance. It does not test: picking resistance, bump key resistance, covert entry methods, or cylinder quality. A Grade 1 lock with a three-pin, no-security-pin cylinder is picked in seconds. A Grade 2 lock with a Medeco cylinder is nearly impossible to pick under field conditions. The grade and the cylinder are different things — and for home security, both matter.
A Grade 1 lock with a weak cylinder is still easy to pick. The grade tests the body. The cylinder is a separate conversation entirely.
3. "ANSI Grade and BHMA AAA Rating Are the Same System"
They're related but distinct. BHMA also publishes a three-letter residential rating (Security / Durability / Finish), where each category is rated A, B, or C. An "A" security rating corresponds roughly to Grade 1 security tests, but the systems use different evaluation methods. When in doubt, look for the ANSI grade number — it's the more standardized and widely understood benchmark. If you see "BHMA Certified" with letter grades and no ANSI number, read the spec sheet carefully before drawing comparisons.
The Bottom Line
Which Grade Does Your Door Actually Need?
Front entry deadbolt: Grade 1 if you can find it at a reasonable price point, Grade 2 as the practical floor. The Schlage B60N (Grade 1) and B62N (Grade 2) are a dollar or two apart at most retailers. There's no good reason to go lower on a main entry.
Interior doors (bedroom, bathroom, closet): Grade 3 is exactly right. You're not protecting against forced entry — you're providing privacy. Grade 3 hardware does that well and lasts a very long time in that context.
Apartment building common areas, office entry doors, storage units, garages with interior access: Grade 2 minimum. These doors see more traffic than a residential entry and deserve the higher cycle count.
High-security commercial, healthcare, schools: Grade 1, full stop. Most commercial specifications legally require it — and for good reason. A school door gets opened 50 times a day. A million cycles buys you about 55 years at that rate.
One last thing: whatever grade you choose, the frame matters more than the lock. A Grade 1 bolt throws into a door frame with a single ¾-inch screw holding the strike plate? The frame splits on the first good kick. Spend $15 on 3-inch screws for your strike plate before worrying about the difference between Grade 1 and Grade 2.
