Deadbolts 101: Which Grade Actually Keeps You Safe (Buyer Guide)

TL;DR: Deadbolts are rated Grade 1, 2, or 3 under ANSI/BHMA A156.36 — Grade 1 is commercial-strength (survives 10 hammer strikes at 75 ft-lbs and 250,000 open/close cycles), Grade 2 is residential security-grade, and Grade 3 is the basic builder-grade lock on most front doors today. For $80-150, a Grade 1 deadbolt on your front and back doors closes the biggest security gap in an average home.

_Last reviewed: July 2026 · 7 min read_

Most homeowners have never looked at the small stamp on their deadbolt because they assume "a lock is a lock." It isn't. The grade stamped on the faceplate determines whether that lock stops a kick-in attempt or snaps on the second try, and the difference in price is often less than $60.

Okoniq Property Hub logs which locks are installed on which doors and when they were last serviced, so you're not guessing at grade or age years later.

What do Grade 1, 2, and 3 actually mean?

The grades come from ANSI/BHMA A156.36, an independent test standard that measures strike resistance, cycle life, and pull strength — not marketing copy on the box.

Grade 1 locks are tested to survive 10 hammer strikes at 75 ft-lbs each and 250,000 open/close cycles before failure. These are the standard for commercial buildings and are increasingly available for residential doors, usually priced $80-250. Grade 2 locks handle 5 strikes at 75 ft-lbs and around 150,000 cycles — solid for most homes and priced $35-80. Grade 3 is the entry tier: 2 strikes at 75 ft-lbs and roughly 100,000 cycles, and it's what ships in most $15-30 builder kits and rental turnover packs.

The catch is that Grade 3 is what's already on the door in the vast majority of homes built or flipped in the last 20 years, because contractors buy the cheapest UL-listed option that passes code.

How much force does it take to break each grade?

A Grade 3 deadbolt can fail after a single solid kick from someone under 200 lbs, because the standard only requires it to survive two strikes at 75 ft-lbs before the bolt or strike plate gives way. Grade 2 buys you roughly double that resistance. Grade 1 is built to take a sustained assault, which is why it's the standard on most commercial entry doors and increasingly recommended for street-facing front doors in homes.

The lock itself is only half the equation. A Grade 1 deadbolt screwed into a strike plate held by two ¾-inch screws is barely better than a Grade 3 lock, because the door frame fails before the bolt does. The fix is a reinforced strike plate with 3-inch screws that bite into the framing stud behind the jamb, not just the trim. This single $10 upgrade is often the highest-return fix in the whole security conversation, and it applies whether you're grading up or just tightening what's already there — similar to how 2-prong outlets need a real ground path, not just a cosmetic swap to actually be safer.

Is a Grade 2 deadbolt good enough for most homes?

Yes, for most single-family homes in low-to-moderate crime areas, Grade 2 is a reasonable middle ground between cost and strength. It's the tier the Consumer Product Safety Commission and most insurers implicitly assume when they say "deadbolt installed" satisfies a security requirement, and it's what you'll find in Schlage's B60N and similar mid-tier lines.

Grade 1 makes more sense on ground-floor entry doors, doors facing the street with no visibility from neighbors, or rental units where you can't control who's had a key copied over the years. If you're deciding between grades, here's the practical breakdown:

| | Grade 2 | Grade 1 | |---|---|---| | Strike resistance | 5 hits @ 75 ft-lbs | 10 hits @ 75 ft-lbs | | Cycle life | ~150,000 | ~250,000 | | Typical cost | $35-80 | $80-250 | | Best use | Interior, side, back doors | Front door, rentals, ground-floor units |

Do smart locks come in Grade 1, or are they all weaker?

Yes, several smart lock lines are independently tested and certified to Grade 1, but plenty of budget smart locks only meet Grade 3 or aren't certified at all. The electronics get the marketing attention while the physical bolt mechanism — the part that actually stops a break-in — often gets the cheapest components available. Check the box or spec sheet for the ANSI/BHMA grade explicitly; "commercial-grade" or "heavy-duty" language on packaging isn't the same as a certified Grade 1 rating.

If you're upgrading a smart lock on an older home, it's also worth confirming the door has grounded, code-compliant wiring nearby if the lock needs hardwired power or a video doorbell companion — the same wiring check that matters if you're not sure whether your home still has outdated wiring behind the walls.

What else affects real-world deadbolt security?

Bolt throw length matters as much as grade. A Grade 1 deadbolt with only a ½-inch throw into the frame is easier to pry than a Grade 2 lock with a full 1-inch throw, which is the ANSI minimum for Grade 1 certification. Look for "1-inch throw" specifically on the spec sheet, not just the grade number.

Door material matters too. Even a Grade 1 deadbolt on a hollow-core or thin fiberglass door won't hold, because the door itself splits before the lock fails. If you're upgrading locks on an older property, it's worth pairing the hardware change with a broader walk-through of what else in the house is past its rated life, the same way you'd check a 200-amp electrical panel before assuming the wiring can handle new demands.

FAQ

What ANSI grade is the deadbolt already on my front door?

Check the faceplate or the box if you kept it; certified locks stamp "Grade 1," "Grade 2," or "Grade 3" directly on the strike plate or bolt face. If there's no stamp at all, assume it's an uncertified Grade 3 equivalent, which is common in builder-grade construction.

Is it worth replacing a Grade 3 deadbolt if the door itself is solid?

Yes, in most cases, because a $40-80 Grade 2 upgrade with a reinforced strike plate can be installed in under 30 minutes and roughly doubles strike resistance for a small cost. On a solid wood or steel door, the lock is usually the weakest link, so upgrading it captures most of the security benefit.

Do landlords have to disclose deadbolt grade to tenants?

Most states don't require grade disclosure, but many do require a working deadbolt on every exterior door as part of habitability standards. Check your state's landlord-tenant statute or ask your association's attorney if a specific grade is required in your lease template.

Can I upgrade just the strike plate without replacing the whole lock?

Yes, and