What’s the Difference Between Grade 1 and Grade 2 Cylindrical Locks?

When it comes to securing your property, choosing the right lock is a critical decision. Among the many options available, cylindrical locks are one of the most popular choices for businesses, residential buildings, and other applications. But not all cylindrical locks are created equal. Understanding the difference between Grade 1 and Grade 2 cylindrical locks is essential to finding the right solution for your security needs.

This post will explain what cylindrical locks are, the grading system used to classify them, and the key differences between Grade 1 and Grade 2 locks. By the end, you’ll have a clear understanding of which lock grade is best suited for your security requirements.

What Are Cylindrical Locks?

A cylindrical lock is a type of lock mechanism commonly used in doors for commercial and residential properties. They are known for their straightforward installation, durability, and efficiency. Cylindrical locks feature a cylinder that contains the mechanism for locking and unlocking. The lock operates by inserting a key or a pin tumbler system into the cylinder.

Cylindrical locks are often chosen for their cost-effectiveness and ease of replacement, making them a go-to choice for many contractors and locksmiths.

Applications of Cylindrical Locks  

Cylindrical locks are versatile and commonly used in various environments, including:

● Office buildings to secure rooms and offices.

● Homes as a reliable lock for entry and interior doors.

● Public facilities such as schools and hospitals.

Their adaptability ensures they meet a wide range of security needs, but the quality and functionality vary depending on their grade.

What Does Lock Grading Mean?

Cylindrical locks are graded using a standard grading system developed by the American National Standards Institute (ANSI) and maintained by the Builders Hardware Manufacturers Association (BHMA). The grading system ensures that locks meet specific performance standards related to security, durability, and strength.

The Three Grades of Locks  

There are three ANSI grades for cylindrical locks:

● Grade 1: The highest level of security and durability. Often referred to as "heavy-duty" locks.

● Grade 2: Provides a mid-level of security and durability. Commonly used in light commercial and some residential applications.

● Grade 3: The most basic level of security. Typically intended for residential use with lower traffic requirements.

These grades are determined based on several factors, such as  operation, durability, strength and security.

Why Does Grading Matter?

The grading system gives consumers confidence in their lock's performance. Choosing the right grade ensures that the lock will meet your specific needs and minimize security risks. Opting for the wrong grade, however, could leave you or your building vulnerable to unauthorized access or undue wear and tear.

Key Differences Between Grade 1 and Grade 2 Cylindrical Locks  

Now that you understand the grading system, let's take a closer look at the specific differences between Grade 1 and Grade 2 cylindrical locks.  

1. Durability  

Grade 1 cylindrical locks are designed to withstand rigorous use and high traffic. They are tested to endure at least 1 million cycles (the number of times the lock can be operated). These locks are engineered for heavy-duty performance and are ideal for environments where doors experience frequent use.  

Grade 2 locks, on the other hand, are rated for medium-duty performance. They must pass a minimum threshold of 500,000 cycles. While they are durable and well-suited for many settings, they are not built to handle the wear and tear of extreme high-traffic conditions.  

2. Strength Against Forced Entry  

Grade 1: Two blows of 60 ft-lbf plus two 

blows of 90 ft-lbf plus two 

blows of 120 ft-lbf (160 J)

Grade 2: Two blows of 60 ft-lbf plus two 

blows of 90 ft-lbf

3. Common Applications  

● Grade 1:

Grade 1 cylindrical locks are typically used in commercial and industrial settings, such as office buildings, schools, hospitals, retail spaces, and government facilities. Their rugged construction ensures they can handle frequent use without compromising on security.  

● Grade 2:

Grade 2 locks are generally installed in light commercial applications or residential buildings. For example, they work well for homes, small offices, or secondary doors in commercial buildings.  

4. Price Point  

Due to their enhanced durability and security features, Grade 1 locks are more expensive than Grade 2 options. While Grade 2 locks are a more budget-friendly alternative, they may not provide the same level of performance and reliability for high-demand environments.  

5. Compliance Standards  

ANSI/BHMA A156.2-2022 STANDARD for BORED AND PREASSEMBLED LOCKS AND LATCHES

When to Choose a Grade 1 Lock  

If your priority is maximum security and durability, Grade 1 cylindrical locks are the way to go. Consider them for:

● High-traffic doors such as main entrances or storerooms.

● Commercial properties that require increased security.

● Doors prone to heavy use, wear, or tampering attempts.

While they are costlier, Grade 1 locks are well worth the investment in critical security areas.  

When to Choose a Grade 2 Lock  

Grade 2 locks are suitable for moderate security needs and areas with light to medium traffic. Choose Grade 2 locks for:

● Residential entry or interior doors.

● Offices with low traffic.

● Cost-conscious projects where high security isn’t a top priority.

They strike the right balance between affordability and performance, making them ideal for non-critical applications.  

Final Thoughts  

Choosing between Grade 1 and Grade 2 cylindrical locks ultimately depends on your specific needs. If you need heavy-duty security for a high-traffic area, Grade 1 locks are your best bet. For less demanding environments, Grade 2 locks offer reliability and affordability.

Regardless of your choice, one thing is certain: selecting the right lock grade is a key step to securing your property effectively. By understanding the difference between Grade 1 and Grade 2 cylindrical locks, you can make an informed choice that suits your budget and security requirements.

Interested in learning more about cylindrical locks or upgrading your current security system? Contact one of our experts today to discover the best solutions for your needs.

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