What is Bolt Throw, and Why Does it Matter?

Understanding Bolt Throw Lengths

When it comes to door locks, the bolt throw length is a critical factor that determines the lock’s security and functionality. The bolt throw refers to how far the bolt projects from the lock into the strike plate when engaged. In this blog, we’ll explore the concept of bolt throw lengths using the Yale Unity Slim lock as an example, comparing its short bolt throw (13mm projection) and long bolt throw (22mm projection). We’ll also discuss the types of installations where each is best suited.

What is Bolt Throw, and Why Does it Matter?

The bolt throw length impacts: 

Security: A longer bolt throw offers better resistance to forced entry. 

Compatibility: Shorter bolt throws may be necessary for certain installations, such as narrow door frames.

Ease of Use: The length can affect how smoothly the lock engages with the strike plate. Yale Unity Slim: Short vs. Long Bolt Throw

Short Bolt Throw (13mm Projection)

Features: The bolt projects 13mm from the lock, making it ideal for installations where the door frame is shallow or has limited space. 

Ideal for: 

• Internal doors or low-security applications.
• Doors with narrow strike plate recesses. 

Advantages: 

• Easier to install in tight spaces. 
• Suitable for retrofitting without significant modifications. 

Considerations: While convenient, the shorter bolt may not provide the same level of resistance to forceful attacks as a longer throw.

Long Bolt Throw (22mm Projection)

Features: The bolt projects 22mm, offering deeper engagement with the strike plate and increased security. 

Ideal for: 

• External doors or high-security applications. 
• Situations where the door and frame can accommodate deeper bolt penetration. 

Advantages: 

• Superior resistance to forced entry. 
• Better alignment for heavy-duty doors and frames.

Considerations: Requires sufficient space in the door frame and may necessitate more precise installation.

Choosing the Right Bolt Throw for Your Installation 

1. Assess the Door and Frame: 

• Measure the depth of the strike plate recess. 
• Consider the thickness and material of the door. 

2. Determine Security Needs: 

• For internal doors or low-risk areas, the 13mm bolt throw might suffice. 
• For external or high-risk areas, prioritize the 22mm bolt throw. 

3. Account for Installation Challenges: 

• Shorter bolt throws often require less modification to the frame. 
• Longer bolt throws may demand additional adjustments but provide added security benefits.

Conclusion 

Selecting the right bolt throw length ensures your lock is both secure and functional for its intended use. The Yale Unity Slim lock offers flexibility with its 13mm and 22mm bolt throws, catering to diverse installation needs. Always evaluate your security requirements and the structural constraints of your door and frame before making a choice. 

Have questions about bolt throws or need assistance choosing the right lock? Contact us for expert advice!