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Anatomy of a Hinge

Door hinges are fundamental components that hold doors in place. They enable it to swing open, close and latch in place many times over. The hinge has a crucial role to play in the overall functioning of the door. Overall, the door relies on its hinges to perform the basic purpose that it is designed to do.

These days however, hinges have aesthetic features as well. Their finishes, materials and styles allow them to complement interior design effectively. Still, the function of the door remains the leading operation for it. In this regard, hinge parts play a vital role in ensuring how long and efficiently the component serves its purpose.

In this article, we will dissect the anatomy of a door hinge and how the various hinge parts play a role in the longevity of the component.

Components of a Hinge

Hingesare physical joints that allow two work pieces to rotate within a constrained and defined range of motion. Doors have one hinge at the top, one at the bottom with more in between depending on the size of the door. Hinges control the rotation of the door. Based on the type of hinge, the door will open to a certain extent. Some type of hinges close the door automatically while others allow it to stay open unless it is closed with physical force.


The first and most significant component of the hinge is the leaf. This is the part with screw holes in it. The leaf attaches to the door frame and swings with it. Most hinges have a leaf that is rectangle in shape as it allows the maximum surface area to control the door, irrespective of the size. Flag hinges are the only ones that don’t have two leaves otherwise all other hinges are more or less the same basic structure.


A knuckle is the central tube going through the center of almost all door hinges and is also known as a loop or node. The knuckle isn't a standalone piece. Rather, it is formed when the leaves of a hinge are connected. The place where leaves end, the knuckles begin as a rounded component that forms a joint that connects both leaves together.


A pin, is a small plug that is cylindrical in shape and is inserted into the hollow center of the knuckle of a hinge. The appendages on the leaf of a hinge are hollow. As a result, the knuckle also leaves space for the pin to be inserted within it.

Door hinges and their leaves are meant to lock as a pin is passed through the knuckle. The leaves will not stay attached if you don't use a pin. The hinge will not establish a junction if the leaves are not attached. An easy approach is to use a pin to keep the leaves from separating.

Types of Hinges Available

There are various types of hinges available on the market today. Every hinge can have certain benefits and disadvantages. There is also the matter of whether the style of the hinge will complement the overall design of the room. Other elements of door hinges can include their costs and lifespan depending on the traffic that the place will experience.

Some of the most common types of door hinges include:

  • Ball Bearing Hinges:They are the most popular and widely used hinge. It is the ideal device to indicate hinge parts and are mostly placed at internal doors. These hinges pivot on small race bearings thus giving them their name. The action of these door hinges is quite smooth allowing doors to withstand long periods of use. They are mostly available in stainless steel.
  • Parliament Hinges:These types of hinges fold back on themselves at a 180 degree angle. These hinges are used on a pair of doors between the lounge and dining room or on a pair of external doors into the garden in a modern home or apartment. The hinges resemble a butterfly when folded out.
  • Single and Double Action Spring Hinges:Within the pivot knuckle, there is a spring action in these type of door hinges. Single action hinges work in only one direction, similar to a regular hinge, however double action hinges work in both directions, allowing the door to open in either direction.

There are various other types of hinges each with their own characteristics. Before you purchase the right door hinges, understand the hinge parts and types to make a more informed decision for your type of respective property.

Importance of Understanding the Anatomy of Door Hinges

Hinge parts form the basic structure of the components. They have a bearing on a lot of functions that a door performs but most importantly, it ascertains what kind of use the door can withstand. Restaurants or other commercial spaces and their doors witness a lot of traffic. This happens on a daily basis which means that the hinges have to be able to withstand this type of use.

On the other hand, home doors don’t see as frequent use as commercial spaces do. Home door hinges can be more aesthetic with less reliance on functionality if that’s you prefer at times. However, it is important to note that all these factors are based on what components are used in the hinge parts. As a result, knowing the anatomy of the hinge is crucial even for home owners.


Door hinge parts dictate the durability, resistance, and smooth operation of any and all doors. Before you head out to purchase the right hinges for your door, make sure you read up about it.

If you are looking for a wide variety of door hinges, visit our website for the best collection available.