A Comprehensive Guide To Exploring The Different Parts Of A Door Knob

Key Takeaway

  • The components of a door knob include the knob/lever, rose plate, latch bolt, face plate, strike plate, lock cylinder, spindle, and deadlock latch.
  • Door knobs are designed to operate a latch mechanism that secures a door in place when the knob is turned.

Have you ever wondered what goes into a doorknob and how it works? I certainly have, and it’s led me down a path of discovery and research that I’m excited to share with you!

As someone who loves DIY projects, I recently found myself needing to replace a doorknob in my home. That’s when I decided to dig deeper and learn more about the different components of a doorknob, from the latch assembly to the lock cylinder and everything in between. I’ve come to appreciate the level of precision and engineering that goes into creating a reliable and durable door knob.

In this blog, I’ll be exploring the different parts of a door knob in detail, including how they work together to keep your home secure.

Doorknob Anatomy: Parts Of A Door Knob

Doorknob parts explained



The function of the knob of a door knob is to provide a comfortable and secure grip that can be turned, pressed, or pulled to open or close the door. It is the most visible and easily accessible part of the doorknob, located on the outside of the door. The knob may come in various shapes, sizes, and materials, like steel, hardened steel, brass, etc., to match the overall design and style of the doorknob. 

Rose Plate Or Rosette

Rose Plate Or Rosette

The rose is the round plate that sits against the door and surrounds the base of the knob. It serves to cover up the hole in the door where the knob is installed and provides a decorative touch. Roses can come in different finishes and designs to match the overall style of the door knob.

Latch Bolt

Latch bolt in a doorknob

The latch bolt is the most critical part of the latch assembly. It is a metal piece that extends from the doorknob and slides into the door frame to secure the door in place. When you turn the door knob, the latch bolt retracts, allowing the door to open. When the door is closed, the spring-loaded latch bolt extends into the door frame and keeps the door locked.

Face Plate

Face plate in a doorknob

The faceplate is a metal plate that surrounds the latch bolt and is attached to the door. It protects the door from damage caused by the latch bolt and also gives the door knob a finished appearance.

Strike Plate

Strike plate

The strike plate is a metal plate that is attached to the door frame opposite the latch bolt. When the door is closed, the latch bolt slides into the strike plate, securing the door. The strike plate is also designed to prevent the door from being kicked in by distributing the force of impact across the door frame.

Lock Cylinder

Lock Cylinder

The lock cylinder is part of the doorknob that contains the locking mechanism. It is located inside the knob and can be accessed by inserting a key or entering a code. When the lock is engaged, the cylinder rotates to prevent the knob from turning, thus keeping the door securely closed.

Lock Cylinder
  • Lock cylinders contain a series of pins that must align with the notches on a key in order to unlock the lock.
  • Pins are typically made of metal and vary in length. They are positioned within the cylinder and interact with the key, allowing the lock to turn and open.
  • Upper pins, also called driver pins, are larger than key pins and sit above them within the cylinder. They interact with the key pins to ensure that the correct key is being used and prevent the lock from being picked or bumped.
  • Springs are positioned above each pin, providing tension and keeping the pins in place.
  • When the correct key is inserted into the keyway, the pins align along what is known as the “shear line,” which allows the lock to be turned and unlocked.
  • The plug is the central part of the cylinder that rotates when the lock is turned. The plug engages with the locking mechanism, either a latch or a bolt, to secure or release the lock.
  • The cam is a small metal piece that sits at the back of the cylinder and rotates along with the plug. The cam interacts with the locking mechanism to release the lock, typically by retracting a bolt or latch.



The spindle is the metal rod that connects the knob on the outside of the door to the latch assembly on the inside. It is usually threaded and screwed into the latch mechanism to hold it in place. When the knob is turned, the spindle rotates and operates the latch assembly, allowing the door to open or close.

Deadlock Latch

Deadlock Latch

The deadlock latch is an additional locking mechanism that provides extra security. It is usually located above or below the latch assembly and can be engaged by turning the knob or pressing a button. When engaged, the deadlock latch extends into the strike plate, preventing the door from being opened even if the latch assembly is manipulated.

Many door knobs and locks incorporate a deadlatch mechanism, but not all of them do. Deadlatches are commonly found in residential and commercial doors that require a higher level of security, such as front doors, office doors, and exterior gates. However, some interior doors, such as those in bedrooms and bathrooms, may not have a deadlatch, as they do not require the same level of security.

How Do Door Knobs Work?

  • Doorknobs are designed to operate a latch mechanism that secures a door in place. When a doorknob is turned, it engages with the latch mechanism and either releases or secures the door. Here’s a breakdown of how it works
  • When the doorknob is turned, it rotates the spindle, which in turn engages with the latch mechanism. The latch bolt retracts from the striker plate, opening the door. 
  • When the doorknob is released, the spring-loaded latch bolt returns to its original position, engaging with the striker plate and securing the door

Frequently Asked Questions

Q1. How to maintain a door knob so that the internal parts don’t wear out?

Answer – To maintain a door knob and prevent internal parts from wearing out, follow these tips:

  • Keep it clean: Regularly wipe down your door knob with a damp cloth to remove dirt, dust, and grime.
  • Lubricate the moving parts: Apply a lubricant, such as silicone spray or graphite powder, to the moving parts of the doorknob, including the latch assembly and lock cylinder. This will help to reduce friction and prevent wear and tear.
  • Tighten loose screws: Check the screws that hold the door knob in place and make sure they are tight. Loose screws can cause the door knob to wobble, which can increase wear on the internal parts.
  • Replace worn-out parts: If you notice any parts of the door knob that are worn out, such as the latch assembly or lock cylinder, consider replacing them before they cause further damage to the rest of the door knob.
  • Use the door knob properly: Avoid using excessive force when turning the door knob, as this can cause unnecessary wear and tear on the internal parts.

Q2. Can you replace individual parts of a door knob?

Answer – Yes, in many cases, you can replace individual parts of a door knob if they become damaged or worn out. However, it’s important to make sure that the replacement parts are compatible with your existing door knob.


Exploring the different parts of a door knob can help you better understand how this common household item works and how to maintain it. By understanding the various components of a door knob, you can more easily troubleshoot any issues that may arise and even replace individual parts as needed. Whether you’re a homeowner or a renter, having a basic knowledge of door knob parts and how they work can help you keep your doors secure and functioning properly. So next time you use a doorknob, take a closer look at the different parts and appreciate the engineering that goes into making this everyday object work.

Leave a Comment

Hey! I am Mark. Though I am not a locksmith by profession, but locks have always fascinated me since my teens. And it all started when I got locked out of my house and I had to pick the lock. Since then it has become my hobby to learn more about different kinds of locks, understand their working and methods to pick them up. In due course of time, I have also become better aware of how installing the right lock goes a long way in ensuring iron clad security. I aim to share my passion (about locks) through this blog. If you are also passionate about picking locks or are just looking to beef up the security, hop on the ride.