We regularly review the latest smart locks–deadbolts, most often–reporting our impression on their design, installation process, daily use, their related mobile app, and more. What we can’t tell you is how well the lock will withstand years of exposure to the elements, how many open/close cycles it should deliver before it fails, or how difficult it will be for an intruder to defeat it—either by lockpick or brute force.
To answer those thorny questions, we consult the ANSI and BHMA standards bodies, both of which provide ratings about the long-term physical capabilities of a lock. But what do those ratings mean, and why doesn’t every lock manufacturer use them?
Let’s dig deeper.
The ANSI grades of 1, 2, and 3 are for commercial use, and [the BHMA] A, B, and C ratings are for residential use.”
BHMA director of standards Anthony Gambrall
Understanding ANSI ratings
ANSI, the American National Standards Institute, is a nonprofit organization that dates to 1918(!). It represents hundreds of thousands of companies and manages standards for a vast array of products, ranging from the size of a piece of paper to the way nuclear power plants should be cooled.
This story is part of TechHive’s in-depth coverage of the best smart locks.
ANSI ratings for locks place them into one of three categories: 1, 2, or 3. These are seemingly broad buckets where 1 is highest and 3 is lowest. According to ANSI:
- ANSI grade 1 locks are top-of-the-line products that (for deadbolts) must withstand 250,000 open/close cycles and 10 blows with a hammer delivering 75 foot-pounds of force.
- ANSI grade 2 locks are midgrade locks that can handle 150,000 cycles and 5 hammer blows.
- ANSI grade 3 locks are entry-level locks that must handle 100,000 cycles and 2 hammer blows.
Those are fairly simplistic gradations; they might even sound vague. There’s a reason for that: ANSI doesn’t test locks—or anything, for that matter. Rather, it oversees standards that are developed by third-party groups and signs off on whether those standards are up to snuff. A vast number of partners with much more specialized expertise are responsible for managing the testing protocols for products. In the case of locks, the three ANSI grades are derived not from ANSI’s tests but from tests that an industry group called BHMA (Builders Hardware Manufacturers Association) oversees.
Our pick for the best mainstream smart lock
Understanding BHMA ratings
BHMA
BHMA has developed standards to cover more than 40 categories of building materials products, including “locks, closers, exit devices, butts, hinges, power-operated doors, and access control products.” Its job is primarily to serve builders by guiding them to the suitability of various building products for specific types of construction.
BHMA director of standards Anthony Gambrall says BHMA has traditionally served the commercial building community, but in 2015 it expanded into the residential space. Today, two separate sets of standards exist, one for commercial buildings and one for residential, which explains why locks can have an ANSI rating, a BHMA rating, or both. “The ANSI grades of 1, 2, and 3 are for commercial use,” he says, “and A, B, and C ratings are for residential use.”
While BHMA operates a blanket website at buildershardware.com, consumers are directed to a separate site to get more information on relevant certifications: securehome.org. While buildershardware.com covers a wide range of building products, the securehome.org site is exclusively focused on just two: locks and deadbolts. These are denoted as ANSI standards A156.39 (Residential Locksets and Latches) and A156.40 (Residential Deadbolts).
BHMA certification is tough. If there are 15 tests in a category, and the lock meets the top level on 14 tests but gets a B grade on one, the lock will earn the lowest grade that comes out of the tests, a B.
How ANSI and BHMA ratings are calculated
Michael Brown/Foundry
To receive a rating (either ANSI or BHMA), a manufacturer must submit their hardware to a BHMA-approved lab for analysis and, ultimately, a certification for the product. This is a strictly voluntary process, and manufacturers are directed to work with one of the two labs designated by BHMA—either UL (Underwriters Laboratory) or Intertek—to complete the certification process. The lab charges the manufacturer for testing, and BHMA charges the manufacturer for administrative costs related to managing the certification.
Lab testing involves numerous tests that fall into three categories:
- Key control: How readily available are blank keys for the lock? How difficult is it to create a new key?
- Destructive tests: How difficult is it to drill the lock or destroy it via various physical means?
- Surreptitious entry resistance tests: How difficult is it to pick the lock or otherwise bypass the lock’s security?
Once complete, the manufacturer receives a report and, assuming the product passes the lab tests, a BHMA Certified mark which it can use on branding, advertising, packaging, social media, and the like. BHMA Certified products must be periodically re-tested to maintain their certification. A sample BHMA certificate is pictured higher up this page.
It can be difficult to determine if a smart lock is truly BHMA or ANSI certified. Some manufacturers, including Yale, state merely that their “locks are tested to industry-leading BHMA standards.”
Robert Strohmeyer/TechHive
A BHMA Certified mark includes letter grades for three categories: Security, Durability, and Finish. The grade levels work like in school: C is “good,” B is “better,” and A is “best.” One grade is issued for each category, below:
- Security measures both the ability of the lock to withstand impact either from physical damage or extreme weather (like exposure to flooding).
- Durability is a measure of the lock’s performance over time and how resistant it is to wear and tear. It also measures “how well a lock or deadbolt operates with excessive weight on the door—such as a hanging purse.”
- Finish is more cosmetic in nature, measuring how well the lock withstands long-term conditions due to exposure to the elements. It namely concerns the ability of the lock to maintain its appearance and avoid corrosion or discoloration.
There’s a bit of crossover in these categories, but most consumers should likely be most concerned with the Security rating.
Our pick for best smart lock overall
BHMA certification is tough, and AAA certification is much less common than you might expect. Gambrall (and a perusal of some of the testing protocols) confirms that these tests are not trivial.
“Let’s say there are 15 tests in a category, and you meet the top level on 14 of them,” Gambrall said. “On one of the tests you earned a B grade. Well, your lock receives the lowest grade that comes out of these tests, so your lock gets a B.”
ANSI grades align roughly with BHMA grades, Gambrall said, but the ANSI grades are a little tougher, since they are designed for commercial use and BHMA grades are residential. An ANSI grade 2 is roughly equivalent to a BHMA security grade A, according to Gambrall, but it’s not apples to apples. Part of the confusion is because commercial builders all have very strict building codes they must follow, right down to door hardware.
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