Understanding Commercial Lock Grades: What Do They Mean?

 

When choosing locks for your business, security should be a top priority. However, not all locks are created equal. The American National Standards Institute (ANSI) and Builders Hardware Manufacturers Association (BHMA) have established a grading system to help businesses determine the durability and security level of commercial locks. But what do these lock grades really mean? Let’s break it down.

How Are Lock Grades Determined?

To better understand how lock grades are assigned, it helps to know the specific tests and requirements involved. The ANSI/BHMA A156.13 standard, primarily used for mortise locks in commercial and institutional facilities, follows a structured evaluation process. These tests fall into six key categories:

1. Operational Tests

This ensures that doors latch easily when pushed closed, with all grades requiring a maximum of 4.5 pounds of force to engage. Additionally, levers must retract with no more than 28 inch-pounds of rotational force, ensuring accessibility.

2. Cycle Tests

Locksets are installed on mechanically operated test doors and repeatedly used until they reach the required cycle counts:

• Grade 1: 1,000,000 cycles
• Grade 2: 800,000 cycles
• Grade 3: 800,000 cycles

3. Strength Tests

These tests confirm that lock components, including trim, latches, deadbolts, and internal mechanisms, can withstand excessive force while continuing to operate. For example, all grades must endure at least 360 pounds of force applied to the lever without failure.

4. Security Tests

Security tests simulate forced entry attempts, such as impact testing using a ram on the cylinder face. The number of blows a lock can withstand varies by grade:

• Grade 1: 10 blows at 75 ft.-lbf (100 J)
• Grade 2: 5 blows at 75 ft.-lbf (100 J)
• Grade 3: 2 blows at 75 ft.-lbf (100 J)

5. Material Evaluation

The material strength is tested under specific conditions, such as impact testing on the lock’s trim. In these cases:

• Grade 1 must withstand 0.075 inches (1.9 mm) of impact.
• Grade 2 and Grade 3 must withstand 0.100 inches (2.5 mm) of impact.

6. Finish Tests

Locks are subjected to environmental conditions to evaluate their durability against corrosion, wear, and general degradation over time.

Choosing the Right Lock Grade for Your Business

When selecting a lock, consider these factors:

• Traffic Volume: If your doors experience high daily use, opt for Grade 1 locks.
• Security Needs: If protecting valuable assets, choose higher-grade locks.
• Budget: While Grade 1 locks provide the best security, Grade 2 may be a more cost-effective option for lower-risk areas.

Final Thoughts

Choosing the right commercial lock grade is essential for maintaining security and durability in your business. Grade 1 locks provide the highest level of protection and longevity, making them the best choice for high-traffic and high-security areas. Grade 2 locks strike a balance between security and affordability, making them suitable for moderate-use environments. In contrast, Grade 3 locks, while meeting minimum standards, are not designed for commercial settings due to their lower durability and security features. Selecting the appropriate lock grade will help safeguard your property and ensure long-term reliability.

If you need help choosing the right commercial lock, contact us today!