Two Scales Wearing The Same Word
- ● Grades 1 to 3 are commercial
- ● AAA is the residential label
- ● Both cover metal, not software
Smart lock boxes carry two different rating systems that both call themselves grades. Numbers run from Grade 1 down to Grade 3, come from the commercial standards, and put Grade 1 at the top. Letters, as in the AAA badge Schlage prints on the Encode Plus deadbolt listed from $329, come from the residential program, where A beats B beats C in three separate categories.
Neither scale looks at the wireless half of a smart lock. For most homes, a residential lock rated A for security is the sensible target. The badge matters less than the screws holding your strike plate.
Knowing which scale you are reading also stops the comparison mistake that costs money. A Grade 2 deadbolt and an AAA deadbolt are not one step apart, because they were never measured against each other.
Who Decides What A Grade Means
The Builders Hardware Manufacturers Association writes these standards. The American National Standards Institute accredits it to maintain performance standards for locks, closers, exit devices and related hardware, which is why the labels read ANSI/BHMA rather than one name alone.
Grades are not marketing tiers each brand invents. Every standard sets progressive performance benchmarks, and a product earns its grade by surviving the tests written for its category.
That last phrase carries more weight than it looks. Deadbolts, dead latches and lock sets each face their own suite, so two graded products compare cleanly only when they sit in the same category.
Numbers Are The Commercial Scale
The number system runs 1, 2 and 3, with Grade 1 as the highest level of performance. It grew up around commercial doors, where a lock might see hundreds of operations a day for decades.
A Grade 1 deadbolt therefore has to survive more of everything than a Grade 3 one. More cycles, more force against the bolt, more abuse of the finish before corrosion shows.
Residential doors rarely see that duty. A front door in a family home might cycle a few thousand times a year, which is why builders and locksmiths fit Grade 2 hardware without losing sleep.
Manufacturers still like printing Grade 1 on a box, because a number that reads as first place sells locks. The claim is real when certified, and it answers a question most homes never ask.
Letters Are The Residential Scale
The residential program works differently, and this is where most smart lock shoppers land. A lockset or deadbolt carrying the BHMA Certified Secure Home label gets tested for security, durability and finish. It then earns a rating in each of those three categories, where C means good, B means better and A means best.
Three categories mean three letters, which is why the badge reads as a string such as AAA or ABA rather than a single verdict. A lock can excel at resisting attack and merely cope with coastal salt air.
Reading the letters in order tells you where a manufacturer spent its money. AAA means top marks across all three, while something like AAB points at a finish that scored lower than the mechanics.
Schlage describes the Encode Plus as an AAA certified deadbolt, which shows how this label reaches consumers. The number scale never appears on that page, and the two claims do not contradict each other.
What The Tests Actually Do To A Lock
- ● 400,000 cycles for a top dead latch
- ● 1,350 pounds of load against the door
- ● 9 inch-pounds maximum to operate
The residential deadbolt standard, ANSI/BHMA A156.40, gives a feel for the beating involved. Durability means a Grade A residential dead latch has to complete 400,000 cycles of opening and closing.
Strength testing is blunter. One requirement loads the door against the deadbolt with 1,350 pounds of force, which stands in for the shove a shoulder or a pry bar delivers.
Operation gets measured from the other direction. The force needed to retract the latch or bolt must not exceed a maximum torque of 9 inch-pounds, so a certified lock cannot buy strength by turning stiff.
Finish testing runs the hardware through salt spray and humidity to find the point where corrosion appears. That category sounds cosmetic, and it matters most on an exposed coastal door.
The Two Scales Side By Side
| Commercial grades | Residential Secure Home ratings | |
|---|---|---|
| How it reads | Grade 1, Grade 2, Grade 3 | Three letters, such as AAA or ABB |
| Best result | Grade 1 | A in each category |
| What gets scored | One overall grade per product | Security, durability and finish scored separately |
| Typical home fit | More than most doors need | Built around residential use |
| Example claim | Grade 1 deadbolt | AAA certified deadbolt, Schlage Encode Plus from $329 |
| Covers electronics | No | No |
| Where to verify | BHMA Certified Products Directory | BHMA Certified Products Directory |
The bottom two rows are the ones people skip. Both scales cover the metal, the bolt and the finish, and neither one evaluates the part of a smart lock that fails most visibly.
The Half Of A Smart Lock Nobody Grades
Nothing in these standards tests how your lock behaves when the Wi-Fi drops, when the app updates, or when the manufacturer retires a server. Those are the failures owners complain about, and they sit outside the certification entirely.
Battery behavior goes unrated too. A lock that drains four AA cells in a cold February can still hold an A for security, since the grade never looks at power draw.
Hold onto that when a listing waves a grade at you. The badge tells you the mechanical half passed a defined test, and it says nothing about the half that talks to your phone. Our guide to whether smart locks work without Wi-Fi covers what happens when the connected side goes quiet.
Treat the grade as a floor for the hardware, then judge the software on reviews, update history and how the brand handles outages.
Retrofit Locks Inherit The Grade Of Your Old Deadbolt
One category of smart lock never carries a meaningful grade of its own. Retrofit models mount on the inside of the door and turn the thumb turn of the deadbolt you already own.
The bolt, the cylinder and the strike plate all stay exactly as they were. Whatever grade that original hardware earned, or failed to earn, is still the grade protecting the door.
That is not a flaw in retrofit locks. It is the whole point of them, and it is why they suit renters and anyone who likes their existing keys. The trade is that a badge on the retrofit box describes a motor housing rather than a security barrier.
Full replacement locks are the opposite case. They swap the entire deadbolt, so their certification does describe what stands between a visitor and your hallway.
Ask which type you are buying before you weigh any grade at all. The answer changes whether the number on the box has anything to do with your door.
Where The Standards Quietly Disagree With Marketing
Certification is granted per model, and revisions happen. A manufacturer can change a bolt supplier, refresh the housing, or add a new finish, and the listing text often survives that change untouched.
Bundled kits deserve a second look for the same reason. A lock sold with a keypad, a bridge and a spare cylinder may certify only the deadbolt, and the box rarely spells out which piece the badge covers.
Marketplace listings add their own drift. Third-party sellers copy specification tables between similar products, and a grade claim can end up attached to a model that never earned it.
None of this makes grades useless. It means the badge is a starting claim to verify rather than a finished fact, which leads straight to the next step.
How To Check A Claim Before You Buy
Certification applies to a specific model, and sometimes to a specific finish of that model. A product family page that mentions a grade does not prove the exact lock in your cart carries it.
The BHMA Certified Products Directory at buildershardware.com exists for this, and it searches by manufacturer. Two minutes there settle a claim that a retail listing only implies.
Watch the vaguer phrasings as well. Wording such as tested to Grade 1 standards does different work from a certification, because an in-house test is not third-party certification.
Retail copy also goes stale. A listing can repeat a grade after the manufacturer revises the internals, so the directory wins whenever the two disagree. Our roundup of the best smart locks names the models where this check earns its two minutes.
Which Grade Fits Your Door
- ● Rentals rarely need the top tier
- ● Front doors deserve the strength tests
- ● Check the directory, not the listing
You rent and cannot change the deadbolt: grades barely enter the decision, since your landlord chose the hardware. Put the attention on a lock that fits over the existing cylinder and leaves no marks, which our comparison of smart locks and deadbolts for renters works through.
You own the home and this is the front door: aim for A in security on the residential scale, or a certified Grade 2 or better if the product uses the number system. Spend what you save on a reinforced strike plate.
Your door faces salt air or heavy weather: read the finish letter rather than the security one. That category tracks corrosion resistance, and it decides whether the lock still turns cleanly in three years.
You are fitting a side door, a garage entry or an interior office: the lower tiers are genuinely fine here. Traffic is light, and the money moves better toward cameras or sensors.
You mainly want keyless entry for family and guests: choose on codes, sharing and app quality first, then use the grade to filter out anything uncertified. Our comparison of a smart lock against a video doorbell covers which upgrade tends to earn its place first.
What The Badge Cannot Promise
A grade is a floor rather than a guarantee. It tells you a lab put that model through a defined beating and recorded how it held up, which is more than most product claims offer.
It cannot tell you that your door frame will hold. Most residential forced entry breaks the jamb rather than the bolt, so three inch screws through the strike plate into the stud buy more resistance than a jump between grades.
Read the badge, verify it once in the directory, then move to the questions the standard never asked. Whether the app is dependable, whether codes are easy to share, and whether the lock keeps working when the internet does not.
FAQ
Is ANSI Grade 1 better than a BHMA AAA rating?
They are not on the same scale, so neither one outranks the other. Grade 1, 2 and 3 come from the commercial standards, where Grade 1 sits at the top. The AAA label comes from the residential Secure Home program, which scores security, durability and finish separately, with A as the best result in each category.
Do smart locks get graded on their electronics too?
No. The grade covers the mechanical deadbolt, its cycle life, its resistance to force and its finish. Wireless range, encryption, app reliability and battery life sit outside the standard. That gap explains how a heavily graded lock can still ship with a poor app.
How can I confirm a lock really carries the grade the listing claims?
Look up the model in the BHMA Certified Products Directory at buildershardware.com rather than trusting the product page. Certification covers a specific model and finish, so a listing that names a family of locks instead of a model number deserves a check. Retail descriptions also repeat old claims after a model changes.
Does a higher grade actually make my door harder to kick in?
Only partly. The strength tests load the door against the bolt, so a stronger lock helps, though most residential break-ins split the door frame rather than the bolt. A long strike plate with three inch screws into the stud does more for that failure mode than moving up one grade.
Are keypad and lever style smart locks graded the same way?
They fall under different standards. Deadbolts, dead latches and lock sets each have their own test suites, so a smart lever handle faces the tests written for handles. Comparing a graded lever against a graded deadbolt tells you little, because the two products must survive different things.
Sources
- Builders Hardware Manufacturers Association (ANSI/BHMA) — checked 2026-09-08
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This article was written with AI assistance. It is researched and fact-checked, not based on personal hands-on testing unless explicitly stated.
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