When it comes to securing your home or business, understanding the various components of door locks is essential. Knowing the names and functions of door lock parts can help you maintain, repair, or replace your locks effectively. Door lock technology has evolved significantly, with various designs and mechanisms available to suit different security needs. In this comprehensive guide, we will explore the key parts of a door lock, including traditional locks, deadbolts, and keys. By the end of this article, you’ll have a solid understanding of door lock parts, helping you make informed decisions about your security needs.
What Are the Parts of a Door Lock
Traditional door locks consist of several key components, each with a specific function to ensure the lock operates smoothly and securely. Here are the main parts of a door lock:
1. Knob or Lever
The part you turn to operate the lock. Knobs are typically found on older locks, while levers are common in more modern designs. Levers are generally easier to use, making them a popular choice for both residential and commercial properties.
2. Cylinder
The mechanism that accepts the key. The cylinder contains pins and tumblers that align with the key to unlock the door. Cylinders can vary in complexity, with some offering higher security features such as anti-pick and anti-drill protection.
3. Strike Plate

The metal plate attached to the door frame. The latch or bolt extends into the strike plate to keep the door closed. The strike plate is crucial for security, as it reinforces the door frame and helps prevent forced entry.
4. Latch
The movable metal piece that extends into the strike plate. It retracts when the knob or lever is turned, allowing the door to open. Latches can be spring-loaded or deadlocking, with deadlocking latches providing additional security by preventing the latch from being pushed back when the door is closed.
5. Bolt
In some locks, a bolt extends from the door into the frame to secure the door. Bolts are often found in deadbolt locks and provide a higher level of security compared to latches.
6. Faceplate
The metal plate affixed to the door edge where the latch or bolt exits the lock. It adds strength and durability to the lock mechanism, protecting the internal components from wear and damage.
7. Escutcheon
The decorative plate surrounding the knob or lever. It can also protect the lock cylinder from tampering. Escutcheons come in various designs and finishes, adding aesthetic appeal to the door while also providing functional benefits.
What Are the Parts of a Key Called?

Understanding the parts of a key is crucial for comprehending how a lock functions. A typical key has the following parts:
Bow:
The part of the key that you hold. It’s usually the widest part and often has a unique design for grip and identification. The bow can be customized with different shapes and logos, making it easy to identify specific keys.
Blade:
The long, flat part that is inserted into the lock. The blade contains the key's cuts or bittings. The length and width of the blade can vary depending on the lock type.
Cuts or Bittings:
The notches along the blade that correspond to the lock's pins or wafers. Each cut is at a specific depth to align with the pins inside the lock cylinder. The precise arrangement of cuts makes each key unique.
Shoulder:
The part of the key that stops it from being inserted too far into the lock. It ensures the cuts align correctly with the pins. The shoulder also helps prevent damage to the lock and key by limiting how far the key can be inserted.
Tip:
The end of the key that is first inserted into the lock. The tip guides the key into the keyway and starts the alignment process with the lock pins.
What Are the Parts of a Deadbolt?

Deadbolts offer an extra layer of security compared to traditional door locks. Here are the main components of a deadbolt lock:
1. Bolt
The strong metal piece that extends into the door frame to secure the door. Deadbolts usually have a longer, more robust bolt than standard locks, making them more resistant to forced entry.
2. Thumb Turn
The interior mechanism used to operate the deadbolt without a key. It allows you to lock or unlock the deadbolt from inside. Thumb turns provide convenience and quick access in case of an emergency.
3. Cylinder
Similar to traditional locks, the cylinder in a deadbolt accepts the key and contains the pin and tumbler mechanism. High-security cylinders may feature additional protections against picking, drilling, and bumping.
4. Strike Plate
The metal plate attached to the door frame that the bolt extends into. It often includes a reinforced box for added security. The strike plate is essential for withstanding force and preventing kick-ins.
5. Faceplate
The metal plate on the edge of the door where the bolt exits the lock mechanism. It provides a finished look and adds strength to the door edge, reducing wear and tear on the lock components.
What Is the Plate Behind a Door Knob Called?
The plate behind a door knob is known as the escutcheon. The escutcheon serves both a decorative and protective function, covering the hole in the door and providing a finished look. It also helps protect the lock cylinder from tampering and damage. Escutcheons are available in a wide range of styles and finishes, allowing you to match them with your door hardware and overall decor.
Get in Touch With Us
At Park Avenue Locks, we specialize in providing high-quality door locks for both retail and wholesale customers. Whether you’re looking for traditional locks, deadbolts, or specialty lock components, we have you covered. Our extensive selection includes products from leading manufacturers, ensuring you get the best in security and reliability. Visit our website at Park Avenue Locks to explore our wide range of products and get expert advice on choosing the right lock for your needs.
Frequently Asked Questions
What Are the Parts of a Door Handle Called?
The parts of a door handle include the knob or lever, the escutcheon, the spindle (connecting the two handles), and the latch mechanism. The handle itself can come in various designs and finishes, adding both functionality and aesthetic appeal to your door. Some door handles also include additional features like keyholes or privacy locks, depending on the intended use of the door.
What Are the Key Components of a Typical Door Lock?
The key components of a typical door lock include the cylinder, latch or bolt, strike plate, faceplate, and the knob or lever. Each component works together to secure the door and ensure smooth operation. Understanding these parts can help you troubleshoot issues, perform maintenance, and choose the right lock for your needs.
How Do I Choose the Right Door Lock Parts for My Existing Lock System?
When choosing door lock parts for your existing lock system, consider the type of lock you have (e.g., traditional lock, deadbolt), the door's material and thickness, and the security level you require. It’s essential to match the parts with the lock’s brand and model for compatibility. At Park Avenue Locks, we offer a variety of lock parts and expert guidance to help you make the best choice. Our team can assist you in selecting the appropriate components, ensuring they fit seamlessly with your existing system and provide the security you need.