TL;DR
ANSI grades rate lock security: Grade 1 is commercial/highest (800K+ cycles, 10 strikes), Grade 2 is residential heavy-duty (800K cycles, 5 strikes), Grade 3 is basic residential (200K cycles, 2 strikes). For most homes, Grade 2 deadbolts ($75-$150) offer excellent protection. Upgrade to Grade 1 for high-crime areas or maximum security.
- Grade 1: Commercial & high-security residential ($150-$300+)
- Grade 2: Recommended for most homes ($75-$150)
- Grade 3: Basic, interior doors only ($30-$75)
- Higher grades = more cycles, stronger strike resistance
ANSI Grade Comparison
| Grade 1 | Grade 2 | Grade 3 | |
|---|---|---|---|
| Security Level | Highest | High | Basic |
| Best For | Commercial, high-security residential | Most residential | Interior, low-security |
| Cycle Test | 800,000+ | 800,000 | 200,000 |
| Strike Resistance | 10 strikes | 5 strikes | 2 strikes |
| Typical Price | $150-$300+ | $75-$150 | $30-$75 |
| Deadbolt Throw | 1" minimum | 1" minimum | 5/8" minimum |
| Door Thickness | 1-3/4" standard | 1-3/8" to 2" | 1-3/8" to 1-3/4" |
| Commercial Use | Limited | ||
| Exterior Doors | Ideal | Recommended | Not recommended |
| Interior Doors | Overkill | Adequate |
Cycle test = how many lock/unlock operations before failure. Strike test = resistance to door frame attacks.
Understanding Each Grade
Grade 1 — Commercial / High-Security
Specifications
- • Cycle test: 800,000+ operations
- • Strike test: 10 strikes with 75 lb sandbag
- • Deadbolt throw: 1" minimum
- • UL listing: Often available
Recommended For
- • Commercial buildings and offices
- • High-crime residential areas
- • Homes with valuable contents
- • Vacation homes (unoccupied periods)
- • Main entry doors in any home (if budget allows)
Popular Grade 1 brands: Schlage B60N, Medeco Maxum, Mul-T-Lock Hercular
Grade 2 — Residential Heavy-Duty
Specifications
- • Cycle test: 800,000 operations
- • Strike test: 5 strikes with 75 lb sandbag
- • Deadbolt throw: 1" minimum
- • Most common: Standard for quality residential
Recommended For
- • Most residential exterior doors
- • Apartments and condos
- • Garage entry doors
- • Best balance of security and cost
Popular Grade 2 brands: Schlage B60, Kwikset 980, Yale Assure, August Smart Lock
Grade 3 — Basic Residential
Specifications
- • Cycle test: 200,000 operations
- • Strike test: 2 strikes with 75 lb sandbag
- • Deadbolt throw: 5/8" minimum
- • Common in: Builder-grade installations
Recommended For
- • Interior doors (bedrooms, closets)
- • Privacy locks (bathrooms)
- • Low-security applications
- • Not recommended for exterior doors
Note: If your exterior doors have Grade 3 locks (common in new construction), consider upgrading to Grade 2 for better security.
Which Grade Do You Need?
Recommended Grade by Application
- Grade 1: Commercial buildings, high-crime areas, maximum security
- Grade 1: Homes with valuables, vacation properties
- Grade 2: Most residential exterior doors (best value)
- Grade 2: Apartments, condos, standard homes
- Grade 3: Interior doors only (bedrooms, bathrooms)
Avoid These Combinations
- Grade 3 on exterior doors (too weak)
- Grade 1 if budget is primary concern
- Grade 1 for interior doors (overkill)
Beyond ANSI Grades: High-Security Locks
ANSI grades measure durability, but high-security locks add specific attack resistance features:
High-Security Features
- UL 437 Rating: Tested against drilling, picking, and other attacks for 10+ minutes
- Security Pins: Spool, serrated, or mushroom pins resist picking
- Sidebar: Additional locking mechanism (Medeco, Mul-T-Lock)
- Hardened Steel: Anti-drill plates and reinforced bolts
- Restricted Keyway: Keys can't be duplicated without authorization
High-Security Brands
- Medeco: Rotating pin design, pick-resistant ($200-$400)
- Mul-T-Lock: Telescoping pin system ($200-$350)
- Abloy: Disc-detainer, virtually pick-proof ($250-$500)
- ASSA: Sidebar technology ($200-$400)
These cost significantly more than standard Grade 1 locks but provide the highest level of protection.
The Lock Is Only Part of Security
Even a Grade 1 lock is only as strong as its installation and the door/frame:
Common Weak Points
- • Weak door frame (split with kick)
- • Short strike plate screws (should be 3"+)
- • Gap between door and frame
- • Glass near lock (reach through to unlock)
- • Hollow core door (easily breached)
Reinforce Your Entry
- • Replace strike plate screws with 3" screws
- • Install strike plate reinforcement kit
- • Consider door reinforcement plate
- • Add door viewer instead of opening door
- • Use double-cylinder deadbolt if glass nearby
Quick Recommendations
| Your Situation | Recommended Grade | Budget |
|---|---|---|
| Standard home, average neighborhood | Grade 2 | $75-$150 |
| Apartment or condo | Grade 2 | $75-$150 |
| High-crime area or visible entrance | Grade 1 | $150-$300 |
| Vacation home or unoccupied periods | Grade 1 or High-Security | $150-$400 |
| Commercial storefront | Grade 1 | $150-$300 |
| Interior bedroom/bathroom | Grade 3 | $30-$75 |
| Maximum security / high-value home | High-Security (Medeco, etc.) | $200-$500 |
Frequently Asked Questions
What do ANSI lock grades mean?
ANSI grades (1, 2, 3) rate lock durability and security based on standardized tests for cycle count, strength, and attack resistance. Grade 1 is highest (commercial), Grade 2 is residential heavy-duty, Grade 3 is basic residential.
What grade lock do I need for my home?
For most homes, Grade 2 deadbolts provide excellent security at reasonable cost ($75-$150). Upgrade to Grade 1 for high-crime areas, homes with valuables, or if you want maximum security ($150-$300+).
Is Grade 1 worth the extra cost for residential?
Grade 1 provides measurably stronger protection but costs 2-3x more than Grade 2. Worth it for: high-crime areas, visible entrances, vacation homes, or peace of mind. Grade 2 is adequate for most residential needs.
What is the difference between Grade 2 and Grade 3?
Grade 2 deadbolts withstand 800,000 cycles and 5 strikes; Grade 3 handles only 200,000 cycles and 2 strikes. Grade 2 costs ~50% more but offers significantly better durability and security.
Are smart locks ANSI graded?
Yes, quality smart locks from brands like Schlage and Yale carry ANSI grades. Schlage Encode Plus is Grade 1; most Yale and August locks are Grade 2. Always check the grade before buying.
Do apartments need Grade 1 locks?
Typically no. Most apartments have Grade 2 or 3 locks, which are adequate for multi-unit buildings with controlled access. Check with your landlord before upgrading—you may not be allowed to change locks.
What makes a lock pick-resistant?
Pick resistance depends on pin complexity (security pins, sidebars), not just ANSI grade. High-security locks like Medeco and Mul-T-Lock are designed specifically to resist picking, drilling, and bumping.
Does ANSI grade affect insurance?
Some insurance policies offer discounts for high-security locks, but typically require specific certifications beyond ANSI (like UL 437 high-security rating). Check with your insurer for requirements.
Last updated: 2025-12-10