Published 2026-05-03 · Music City Lock
ANSI Grade 1 vs Grade 2 Deadbolts: What the Numbers Mean
Quick answer: ANSI Grade 1 deadbolts endure 800,000+ open-close cycles and resist 10 hammer strikes at 100 ft-lbs; Grade 2 endures 400,000+ cycles and 5 strikes at 75 ft-lbs; Grade 3 falls below most Nashville residential thresholds. The price difference between Grade 1 and Grade 2 at hardware retailers runs $30 to $100 per door. Use Grade 1 on front and back doors, Grade 2 acceptable on interior locking doors.
What ANSI grading actually measures
ANSI/BHMA A156.5 grades residential and commercial locks on three performance dimensions: cycle endurance (how many open-close cycles the lock survives before failure), security (resistance to forced entry plus picking plus drilling attacks), and finish durability (resistance to corrosion, salt-spray, and humidity). The three grades, 1 through 3, set tiered minimum thresholds on each dimension. Grade 1 is the highest standard, Grade 3 the lowest. Most builder-grade Schlage and Kwikset residential cylinders are Grade 2; high-end Schlage Primus and Medeco are Grade 1.
The grades matter because most consumer marketing puts "Grade 1" or "Grade 2" on the box without explaining what that actually buys. The honest summary: Grade 1 is built for commercial daily use; Grade 2 is built for typical residential use; Grade 3 is below the threshold most security-conscious homeowners want. The price difference between Grade 2 and Grade 1 deadbolts at Nashville hardware retailers usually runs $30 to $100 per unit.
The hard ANSI thresholds
| Performance dimension | Grade 1 | Grade 2 | Grade 3 |
|---|---|---|---|
| Cycle endurance (open-close cycles) | 800,000+ | 400,000+ | 200,000+ |
| Forced-entry hammer strikes | 10 strikes at 100 ft-lbs | 5 strikes at 75 ft-lbs | 2 strikes at 50 ft-lbs |
| Pull-out resistance (lbs) | 1,400+ lbs | 1,000+ lbs | 600+ lbs |
| Salt-spray finish hours | 200+ hours | 96+ hours | 24+ hours |
What this means for a Nashville home
For most Nashville homeowners, the choice is between Grade 1 and Grade 2 for a residential deadbolt. Grade 3 is below the threshold real shops install for residential security. Grade 1 makes sense for the front door of a single-family home in any Nashville neighborhood; the daily-use cycle count outlasts the home's other hardware. Grade 2 is fine for interior doors that lock (a basement walkout, a master suite, a home office) where the cycle count is lower and the forced-entry threat is minimal.
| Door location | Recommended grade | Hardware example |
|---|---|---|
| Front door (Nashville single-family) | Grade 1 | Schlage B660, Kwikset 980, Yale Assure 2 |
| Back door or patio entry | Grade 1 | Same as front door |
| Garage entry door (interior to garage) | Grade 2 minimum | Schlage B560, Kwikset 660 |
| Interior locking doors (master or office or basement walkout) | Grade 2 acceptable | Schlage F40-series knob |
| Commercial main entry | Grade 1 mandatory | Schlage L-series mortise |
How ANSI grade interacts with high-security cylinders
The ANSI grade rates the lock body and finish; the cylinder is a separate component with its own quality tiers. A Grade 1 deadbolt body can be paired with a standard pin tumbler cylinder (everyday Schlage), a high-security cylinder with anti-pick and anti-bump pins (Schlage Primus, Medeco Original), or a top-tier restricted-keyway cylinder (Medeco M3, Mul-T-Lock Interactive). The cylinder choice adds another security dimension on top of the ANSI body grade.
For most Nashville residential applications, a Grade 1 deadbolt body with a standard cylinder is sufficient. The upgrade to a high-security cylinder makes sense for front doors in high-traffic neighborhoods, vacation rentals in The Gulch or East Nashville where guest-key control matters, and commercial properties where unauthorized key copying is a real risk.
What ANSI does not measure
- Strike-plate quality. ANSI grades the lock; the strike plate is a separate component. A Grade 1 lock with a builder-grade strike plate (1-inch screws into the jamb) is no stronger than a Grade 3 lock with the same strike plate against a hard kick. The strike-plate upgrade matters more than the lock-body grade.
- Door material. A Grade 1 lock on a hollow-core interior door is as easy to defeat as a Grade 3 lock on the same door. ANSI assumes a solid-core or steel exterior door.
- Frame integrity. Aged wood jambs in pre-1960s Germantown plus Edgefield plus East Nashville homes are often the weakest link. A Grade 1 lock on a rotted jamb does not protect the door.
- Anti-bump pin design. ANSI security testing covers drilling and hammer strikes but not lock bumping. Anti-bump pins are a separate spec beyond ANSI grade.
The price-versus-grade trade-off
Going from a Grade 2 to a Grade 1 deadbolt at a Nashville hardware retailer adds $30 to $100 per door. For a four-door home (front plus back plus garage entry plus basement walkout) that is $120 to $400 over the lifetime of the home. Spread across 15 to 20 years of use, the per-year cost is negligible compared to the security upgrade. Skipping Grade 1 for cost reasons rarely makes sense at the front door.
See our residential locksmith page for hardware install options, or the deadbolt versus smart lock guide for how grades intersect with smart-lock technology.
Frequently asked
Is Grade 1 worth the extra cost for a Nashville home?
For front and back doors yes. The per-door upgrade is $30 to $100 over a Grade 2; spread across 15 to 20 years of use the per-year cost is negligible. Grade 1 cycles endure 4 times more open-close cycles and resist twice the forced-entry strikes. For interior locking doors Grade 2 is acceptable.
What grade are most Nashville builder-grade Schlage deadbolts?
Grade 2. The Schlage B-series builder line is mostly Grade 2; the higher Grade 1 lines (B660 and above, Schlage Primus, Medeco) are upgrades that require either ordering them new or rekey-and-replace through a locksmith.
Will ANSI Grade 1 stop a kick-in attack?
Helps but does not finish the job. The lock body resists 10 hammer strikes at 100 ft-lbs versus 5 strikes at 75 ft-lbs for Grade 2. But the kick force usually defeats the strike plate and jamb wood first; a reinforced strike plate with 3-inch screws matters more than the lock-body grade against a kick attack.
Does Grade 1 mean the lock is pick-resistant?
Not necessarily. ANSI grade measures forced-entry and cycle endurance, not picking resistance. Pick resistance comes from the cylinder design (anti-pick pins, security pins, restricted keyway). High-security cylinders (Schlage Primus, Medeco, Mul-T-Lock) add pick resistance on top of the ANSI body grade.
Where do I find the ANSI grade on a Nashville lock?
On the box or the spec sheet, usually marked as "ANSI/BHMA Grade 1" or similar. If the lock is already installed, the model number on the cylinder face often points to the spec sheet for that line. We can also identify the grade on inspection during any service call.
Is ANSI Grade 1 required by Tennessee code?
Not for residential. Commercial life-safety code (fire egress, panic-bar requirements) sets its own standards above ANSI grade. For residential exterior doors there is no Tennessee state requirement; Grade 1 is a recommended best practice not a code-mandated minimum.
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Last updated: 2026-05-03.