A deadbolt lock is a type of door lock that uses a solid locking bolt that extends into the door frame to secure a door. Unlike a spring latch, a deadbolt does not automatically retract when pressure is applied to the door. It must normally be retracted by turning a key, thumbturn, or other authorized control.
Deadbolts are commonly installed on exterior residential doors, apartment entrances, offices, and other doors where an additional locking point is needed.
How Does a Deadbolt Lock Work?
A deadbolt secures a door by extending a solid bolt from the lock into a compatible opening in the door frame, usually called the strike or strike box.
When the deadbolt is locked, the bolt extends into the frame. Turning the key or interior thumbturn retracts the bolt so the door can open.
A typical deadbolt consists of:
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Deadbolt cylinder
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Lock body
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Bolt
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Thumbturn or interior turn piece
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Keyway
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Strike plate
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Mounting screws
The exact components depend on the deadbolt's design.
What Is a Deadbolt Lock Set?
A deadbolt lock set is the complete collection of components required to install a deadbolt on a compatible door.
A typical residential deadbolt set may include the exterior cylinder, interior housing, deadbolt mechanism, strike plate, mounting hardware, and keys.
Deadbolt lock sets can be sold in different configurations, including:
Single-Cylinder Deadbolt
A single-cylinder deadbolt has a keyed cylinder on the exterior and a thumbturn on the interior. It is one of the most common configurations for residential doors.
Double-Cylinder Deadbolt
A double-cylinder deadbolt uses a keyed cylinder on both sides. This configuration has different egress considerations because a key may be required to unlock the door from the interior.
Keypad Deadbolt
A keypad deadbolt allows authorized users to enter a code instead of using a traditional key. Some models also support physical keys.
Smart Deadbolt
A smart deadbolt adds electronic features such as smartphone control, programmable codes, Bluetooth, Wi-Fi, or smart-home integration, depending on the model.
Types of Deadbolt Locks
Deadbolts can also be classified by their construction and installation.
Single-Cylinder Deadbolt
This design uses a key on one side and a thumbturn on the other. It is widely used for residential exterior doors.
Double-Cylinder Deadbolt
This design uses a key on both sides. Building and fire-safety requirements should be considered before installing this type because interior operation can require a key.
Jimmy-Proof Deadbolt
A jimmy-proof deadbolt uses interlocking components and is commonly associated with certain surface-mounted door applications.
Mortise Deadbolt
A mortise deadbolt is installed within a prepared pocket in the door rather than simply being mounted across the door surface.
Electronic Deadbolt
Electronic deadbolts replace or supplement the traditional key with a keypad, touchscreen, smart credential, or other electronic access method.
How to Install a Door Lock and Deadbolt
Installing a deadbolt normally involves preparing the door and frame for the correct lock dimensions, fitting the deadbolt mechanism, installing the exterior and interior components, and mounting the strike plate.
For an authorized installation:
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Confirm that the deadbolt matches the door's thickness and existing preparation.
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Follow the manufacturer's template and installation dimensions.
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Prepare the door and frame according to the manufacturer's specifications.
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Install the deadbolt mechanism in the door.
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Fit the exterior and interior lock components.
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Install the strike plate and supplied hardware.
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Test the deadbolt with the door open.
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Close the door and verify that the bolt extends and retracts smoothly.
The exact installation process varies between lock models. Manufacturer instructions should take priority, particularly when replacing an existing deadbolt.
How to Pick a Deadbolt Lock
Deadbolt picking refers to manipulating the lock's internal components so that the locking mechanism can be operated without using its normal key.
From a locksmithing perspective, lock picking is a specialized skill used for authorized service, training, and locksport. Deadbolt designs vary considerably, and their resistance to manipulation depends on the cylinder, pin configuration, security features, tolerances, and overall lock design.
For security reasons, detailed instructions for bypassing or picking a deadbolt are not included here. If a legitimate lockout occurs, an authorized locksmith can determine the appropriate non-destructive service method for the particular lock.
How Do You Remove a Kwikset Deadbolt Lock?
Removing a Kwikset deadbolt lock for authorized replacement or maintenance generally involves separating the interior and exterior lock components, removing the mounting hardware, and then removing the deadbolt mechanism from the edge of the door.
The exact procedure depends on the Kwikset deadbolt model. Before removing it:
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Keep the door open.
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Identify the exact Kwikset model.
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Have the replacement hardware available if you are replacing the lock.
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Follow the manufacturer's installation or service instructions.
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Keep track of the mounting hardware and components.
For a standard residential deadbolt, removal typically starts from the interior side of the door, where the mounting screws secure the two halves of the lock. Once the lock bodies are separated, the deadbolt mechanism can be removed from the door edge.
If the deadbolt is damaged, seized, or the door cannot be opened normally, professional locksmith service may be appropriate rather than forcing the hardware.
Deadbolt vs. Door Lock
"Door lock" is a broad term that can describe many different locking mechanisms. A deadbolt is one specific type of door lock.
Other door-locking mechanisms include:
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Pin tumbler locks
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Mortise locks
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Rim locks
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Cylindrical locks
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Lever locks
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Electronic locks
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Smart locks
Therefore, every deadbolt is a type of door lock, but not every door lock is a deadbolt.
Are Deadbolts More Secure Than Regular Door Locks?
A deadbolt can provide a stronger dedicated locking point than a basic spring latch because its solid bolt extends into the door frame and does not simply retract when the door is pushed.
However, the overall security of a door depends on more than the deadbolt itself. The cylinder, bolt, strike plate, screws, door construction, frame, installation quality, and surrounding hardware all contribute to the security of the complete door assembly.
How to Choose a Deadbolt Lock
When choosing a deadbolt, consider:
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Door thickness
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Backset
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Single- or double-cylinder configuration
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Keyway
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Security features
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Strike compatibility
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Finish and hardware style
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Keyed or electronic operation
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Smart-home compatibility
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Installation requirements
For replacement projects, matching the new deadbolt to the door's existing preparation can make installation considerably easier.
Can You Rekey a Deadbolt?
Many keyed deadbolts can be rekeyed rather than completely replaced. Rekeying changes the cylinder's internal pin configuration so an existing key no longer operates the lock and a new key does.
The ability to rekey depends on the specific cylinder and lock system. Some manufacturers also offer compatible rekeying systems that allow homeowners or locksmiths to change the key combination without replacing the complete lock.
Why Are Deadbolts Important?
Deadbolts provide a dedicated locking mechanism for doors where additional security is desired. They are widely used on exterior residential doors and in commercial applications.
Their solid locking bolt, combined with an appropriately installed strike and suitable door hardware, provides a different level of physical security than a simple spring latch.
