ANSI/BHMA Lock Grades: What Grade 1, 2, and 3 Mean

ANSI/BHMA grades are performance classifications for builders hardware published by the Builders Hardware Manufacturers Association under American National Standards Institute (ANSI) standards. Grade 1 is the most demanding class in a given standard. Grade 3 is the least. Grades are not a single universal score that applies the same numbers to every lock type.

The important nuance — and a common source of error online — is that cycle counts and strength tests live inside specific product standards. A Grade 1 deadbolt is not required to survive the same number of operating cycles as a Grade 1 bored knob or lever lockset. Comparing grades only makes sense within the same standard and product family.

What the Grades Are For

BHMA standards define laboratory tests for operation (forces and torques), durability (cycles), strength and security (impacts, loads, bolt strength), and finishes. Manufacturers who certify products state a grade only when the lock meets all criteria for that grade in the applicable standard.

Grade 1 — highest durability and strength thresholds in that standard; often specified for heavy commercial or high-abuse openings
Grade 2 — middle tier; common for many residential and light commercial openings
Grade 3 — minimum tier for the standard; often associated with light-duty or interior hardware

Marketing language that equates “Grade 1” with “unpickable” or “high security” oversells the grade. Grades measure durability and force resistance under the standard’s tests. Cylinder pick resistance, key control, and listing programs such as UL 437 are separate topics. See high-security locks and restricted keyways.

Bored Locks and Latches (ANSI/BHMA A156.2)

ANSI/BHMA A156.2 covers bored and preassembled locks and latches — typical cylindrical knob and lever locksets. BHMA’s public Hardware Highlights for the A156.2-2022 edition state that Grade 1 locks in this category must pass a durability test through one million cycles of opening and closing with a 10 pound axial load applied.

Older editions and many manufacturer summaries historically cited 800,000 / 400,000 / 200,000 cycles for Grades 1 / 2 / 3 under earlier A156.2 texts. Edition year matters. When citing a cycle figure for bored locksets, name the standard and the edition, or hedge as “per the applicable A156.2 edition.”

Impact, torque, and operational-force tests also scale by grade. They are as important as cycle counts for real-world abuse resistance.

Deadbolts and Auxiliary Locks (ANSI/BHMA A156.36)

Standalone deadbolts and related auxiliary locks fall under ANSI/BHMA A156.36 (auxiliary locks / auxiliary hardware), not under the bored-lockset cycle table in A156.2.

BHMA’s Hardware Highlights for A156.36-2020 state that Grade 1 deadlocks must pass 250,000 cycles of opening and closing. The same highlights describe aggressive strength testing, including a 1,350 pound force on the door against the dead bolt for Grade 1.

Secondary industry summaries of A156.36 commonly list deadlock cycle requirements as approximately:

Deadlock cycles commonly summarized for A156.36. Grade 2 and Grade 3 rows are secondary summaries, not figures quoted on BHMA’s public A156.36-2020 highlights page.
Grade	Deadlock cycles (commonly summarized)
Grade 1	250,000 — stated in BHMA A156.36-2020 highlights
Grade 2	150,000 — secondary summary; confirm against the edition in hand
Grade 3	100,000 — secondary summary; confirm against the edition in hand

Treat Grade 2 and Grade 3 cycle rows as secondary summaries unless confirmed against the edition of A156.36 in hand. The Grade 1 250,000-cycle figure is published in BHMA’s own A156.36-2020 highlights.

A Common Cycle-Count Error

It is incorrect to say that a Grade 1 deadbolt must endure 800,000 or 1,000,000 cycles. Those higher figures belong to bored lockset standards (A156.2), not to auxiliary deadlocks (A156.36).

Mortise locks use yet another standard family (historically A156.13), with its own cycle and strength tables. Do not mix mortise figures into deadbolt claims either.

What Grades Do Not Tell You

Key control — open versus restricted keyways
Cylinder security — security pins, sidebars, UL 437, and related listings
Installation quality — strike reinforcement, screw length into framing, door and jamb condition
Code compliance for electrified openings — fail-safe / fail-secure and egress rules for electric strikes and electromagnetic locks

A Grade 1 deadbolt in a weak jamb still fails a kick-in. Grade is necessary context for hardware selection, not a substitute for the rest of the opening.