What is a Double Cylinder Deadbolt? A Comprehensive Guide to Enhanced Home Security

Introduction

When it comes to home security, the right lock can make all the difference. One type of lock that has garnered significant attention is the double cylinder deadbolt. But what exactly is a double cylinder deadbolt, and why might you consider it for your home? Let’s dive into the details.

What is a Double Cylinder Deadbolt?

A double cylinder deadbolt is a type of lock that requires a key to open from both the inside and the outside. Unlike a single cylinder deadbolt, which has a keyhole on the outside and a thumb turn on the inside, a double cylinder deadbolt has keyholes on both sides. This unique design adds an extra layer of security, making it more difficult for intruders to gain access to your home.

Components of a Double Cylinder Deadbolt

Exterior and Interior Keyholes

The defining feature of a double cylinder deadbolt is its dual keyholes. Both the exterior and interior of the door have keyholes that require a key for operation. This means that even if an intruder manages to break a window and reach inside, they still cannot unlock the door without a key.

Locking Mechanism

The locking mechanism of a double cylinder deadbolt is similar to that of a single cylinder deadbolt but with the added complexity of dual key operation. When you insert and turn the key, it engages the bolt, securing the door in place.

How Does a Double Cylinder Deadbolt Work?

The double cylinder deadbolt operates by requiring a key to lock and unlock the door from both sides. When you turn the key, it moves the bolt into the door frame, preventing the door from being opened. To unlock the door, you must use a key from either side to retract the bolt.

Advantages of Double Cylinder Deadbolts

Enhanced Security

One of the primary advantages of a double cylinder deadbolt is its enhanced security. By requiring a key to open the door from both sides, it eliminates the risk of an intruder unlocking the door through a broken window or door glass.

Preventing Unauthorized Entry

Double cylinder deadbolts are particularly effective in preventing unauthorized entry. They are often used in situations where additional security is needed, such as in homes with large windows near the doors or in commercial buildings.

Protection Against Forced Entry

The robust design of double cylinder deadbolts makes them more resistant to forced entry methods, such as kicking or prying. This added durability provides peace of mind for homeowners and business owners alike.

Disadvantages of Double Cylinder Deadbolts

Emergency Exit Concerns

One of the main drawbacks of double cylinder deadbolts is the potential issue during emergencies. In case of a fire or other urgent situations, finding and using a key to unlock the door can be problematic and time-consuming.

Installation Complexity

Installing a double cylinder deadbolt can be more complex than installing a single cylinder deadbolt. It often requires precise alignment and additional tools, making it a more challenging DIY project.

Cost Considerations

Double cylinder deadbolts tend to be more expensive than single cylinder deadbolts. The increased cost can be a consideration for those on a budget.

Common Uses of Double Cylinder Deadbolts

Residential Applications

In residential settings, double cylinder deadbolts are commonly used on doors with windows or glass panels nearby. This prevents intruders from breaking the glass and reaching inside to unlock the door.

Commercial Applications

In commercial buildings, double cylinder deadbolts are often used to secure entry points that require a higher level of security. They are ideal for doors that need to be locked from both sides, such as storage rooms and offices.

Double Cylinder Deadbolts vs. Single Cylinder Deadbolts

Key Differences

The main difference between double cylinder and single cylinder deadbolts is the locking mechanism. Single cylinder deadbolts have a thumb turn on the inside, while double cylinder deadbolts require a key on both sides.

Situational Usage

Single cylinder deadbolts are typically sufficient for most residential applications where emergency egress is a priority. Double cylinder deadbolts are better suited for situations where additional security is needed, and there are no immediate emergency exit concerns.

Installation Process

Tools Required

To install a double cylinder deadbolt, you will need the following tools:

• Drill
• Screwdriver
• Hole saw
• Chisel
• Tape measure
• Pencil

Step-by-Step Guide

1. Mark the Door: Use a template to mark the locations for the holes on the door.
2. Drill Holes: Drill the holes for the lock and the latch.
3. Chisel Out Space for the Faceplate: Chisel out a recess for the faceplate so that it sits flush with the door.
4. Install the Latch: Insert the latch into the hole and secure it with screws.
5. Attach the Lock Mechanism: Install the exterior and interior lock mechanisms, ensuring they are aligned properly.
6. Test the Lock: Test the lock to ensure it operates smoothly with the key.

Maintenance Tips

Regular Inspection

Regularly inspect the deadbolt for signs of wear and tear. Check the alignment and ensure that the bolt moves smoothly.

Lubrication

Use a graphite-based lubricant to keep the lock mechanism functioning smoothly. Avoid using oil-based lubricants, as they can attract dirt and grime.

Key Management

Keep track of all keys and consider rekeying the lock if a key is lost or stolen. Rekeying can be done by a locksmith to maintain security.

Choosing the Right Double Cylinder Deadbolt

Security Ratings

Look for deadbolts with high security ratings. ANSI Grade 1 is the highest rating, indicating superior strength and durability.

Material and Durability

Choose a deadbolt made from high-quality materials, such as solid brass or steel, to ensure long-lasting performance.

Brand Recommendations

Some reputable brands for double cylinder deadbolts include Schlage, Kwikset, and Medeco. These brands offer a range of options with various features and price points.

Legal Considerations

Fire Safety Regulations

Be aware of fire safety regulations in your area. Some building codes restrict the use of double cylinder deadbolts due to concerns about emergency egress.

Local Building Codes

Check local building codes to ensure that the installation of a double cylinder deadbolt is compliant with regulations. Non-compliance can result in fines and safety hazards.

Popular Brands and Models

Top-Rated Options

• Schlage B560P: Known for its durability and high security.
• Kwikset 985: Offers a balance of security and affordability.
• Medeco Maxum: Provides top-tier security features and robust construction.

Price Range

Double cylinder deadbolts typically range from $30 to $200, depending on the brand, material, and security features.

Real-life Scenarios

Success Stories

Many homeowners have successfully used double cylinder deadbolts to enhance their home security. Stories of thwarted break-ins highlight the effectiveness of these locks.

Potential Drawbacks

However, there are also stories of complications during emergencies, emphasizing the importance of considering all factors before installation.

FAQs

Are double cylinder deadbolts safer?

Yes, double cylinder deadbolts are generally safer because they require a key to open from both sides, making it harder for intruders to gain access.

Can double cylinder deadbolts be picked?

While no lock is completely pick-proof, high-quality double cylinder deadbolts are more resistant to picking and other forms of tampering.

How do you unlock a double cylinder deadbolt in an emergency?

In an emergency, you must use a key to unlock a double cylinder deadbolt. It is crucial to keep keys easily accessible but out of reach of potential intruders.

Are double cylinder deadbolts legal?

The legality of double cylinder deadbolts varies by location. Check local building codes and fire safety regulations to ensure compliance.

What is the best brand for double cylinder deadbolts?

Some of the best brands for double cylinder deadbolts include Schlage, Kwikset, and Medeco, known for their quality and security features.

Conclusion

Double cylinder deadbolts offer an added layer of security for both residential and commercial applications. While they come with some disadvantages, such as emergency exit concerns and higher costs, their benefits in preventing unauthorized entry and enhancing overall security are significant. By understanding their features, installation process, and maintenance requirements, you can make an informed decision about whether a double cylinder deadbolt is right for your needs.