29 Different Parts of a Door (With Pictures)

Do you want to Repair or install a door, but you cannot identify the door parts? Not to worry! This article has compiled 29  parts of a door you should know about and where they can be found.

Have you ever tried to repair your door, and the repairman begins to say some Jargon like a door jamb, hinges, and the likes, and you stand there confused, waiting for him to just call the price, so you can pay?  It's time to wise up and put on your learning cap.

Knowing the different parts of a door could help you properly maintain your door and save money on repairs. Many times, people view this information as irrelevant. Kofi Annan once described knowledge as power and information as freedom. You may never know how this information may come in handy in the future.

You may come across different doors, and it is good to familiarize yourself with the various types of doors to identify their parts.  Examples  of these doors include:

  • Mirror doors: Mirrored doors are suited for wardrobes with minimum working space. The limited space means that the door does not have to open wide to create room for space.
  • Hinged doors: The hinged door is the typical household door we come across. They may also be used as wardrobe doors and are best for wardrobe with ample working space
  • Glass doors: Glass doors are doors that are made of glass. They are most common in offices, restaurants and public places. Although they can also be used in homes. Glass doors may come in different types. For example, The Glass may be frosted or tempered. The frosted glass makes the Glass challenging to see through, while the tempered glass is hardened glass.
  • Garage doors: These are doors that are found in the garage. They can be opened either manually or automated. When you are dealing with garage doors, you will most likely come across a torsion spring. Due to the complexity of the garage door unqualified persons should not tamper with the door. It is better to employ the use of a garage door repair company.
  • French refrigerator doors: These are doors that are found on the refrigerator. They are unique doors designed to help seal the fridge.
  • Sliding doors: Sliding doors are doors that move on a rail. The door parts can be purchased at Simi Valley Sliding Door Parts and Repairs. Simi Valley Sliding Door Parts and Repairs is a specialized company in-home repairs and door part sales for sliding doors.

Door parts

Most parts of a door can be classified into two. Namely:

Combustible materials:  Combustible materials are highly flammable materials. They are construction materials prone to burn quickly. Examples of flammable materials are lumbers, plywood, and other materials.

Non-combustible materials: Non-combustible materials are materials that are not inflammable. That is, they do not readily catch fire. Examples are Glass, metal, cement concrete, and even bricks.

A door part may be made of both combustible and Non-combustible materials

Here are 29 common parts of a door:

1. Door Jamb

Door Jamb

The Door Jamb is the most popular part of a door. We have all heard of the Door jamb, but are we able to identify a door jamb? A door jamb is an erect post that is found on each wing of the doorpost. It helps to sustain the door frame and the door. Door jambs are typical in all hinge doors

2. Door Sill

Door Sill

The door sill is found at the foot of your door. It acts as a seal that shields the internal system of the door from dirt and water, which could be damaging to the door system. It is a footplate in which other members of the door are attached.

3. Hinge


A hinge is a flexible apparatus that permits the pivoting or opening and closing of a door. It is attached to the door frame and the door. It is fostered by a hinge pin, which helps to sustain the door to the door frame.

4. Door Stops

Door Stops

The Doorstops is a piece of wood or metal attached to a door frame to prevent it from opening or closing beyond control. The door stop helps to preserve the hinge from damage from swinging out of control. It prevents physical damages to the door. Although it is a tiny part of a door, it performs a vital function in maintaining the door.

5. Door Trim

Door Trim

The door trim performs a decorative purpose. It helps mask the untidiness of where a jamb and a header connect with the rough opening. The absence of decoration will give you a hideous door, as there will be space between the wall and the door.

6. Rough Opening

Rough Opening

The rough opening is the hidden part of the door, yet it is one of the most crucial parts. It is the space found in the wall that sustains the door frame. The door frame is fastened into the rough opening through a shim, a chunk of wood fixed between the edges of the rough opening and the door frame to hold it.

7. Hinge Pin

Hinge Pin

This tiny piece of the door plays a crucial role in the overall functioning of the door. The hinge pin is a small metal screw or nail. It is trusted in the hole of the hinge plate, and it is what holds the hinge, the door frame, and the door together.

8. Door Header

Door Header

The door head is found at the upper part of the door frame. The header is mainly confused with  Jamb. The significant difference is the former is located at the two sides of the post and the header at the uppermost part of the door frame.

9. Casing


The casing is also described as the Door Frame. It consists of the Jamb found at both sides of the post and a header.  The casing is fitted into the rough open during door installation.

10. Stile


The Stile is found on the sides of the door. On one side of the door is the hinge, while on the other is the lock. The hide section is called a hinge stile, while the lock section of the door is called lock stiles.  The Stile acts as a frame to both sides of the door.

11. Bottom Rail

Bottom Rail

The Bottom Rail is the bottom-most part of the door. They perform the same role as the Stile in that they act as the frame of the door. The bottom rail helps to cover the bottom part of the door.

12. Top Rail

Top Rail

The top frame does the same function as the bottom rail in that it helps to enclose the uppermost part of the door. It gives aesthetic value to the door. As we have stated, it is found at the upper layer of the door.

13. Door panel

Door panel

The panel is the outer surface of the door. The panel adds aesthetic value to the door and also gives the door structure. A door panel could come in a single panel or multiple panels, depending on the design of the door.

14. Door Knob

Door Knob

The function of a doorknob is simply to help you open the door easily. The doorknob, or as we all called it, the door handle, allows for easy handling of the door. To open the door, you simply turn the doorknob and push or the door open. To close the door, simply pull or push the doorknob towards you.

15. Door Lock

Door Lock

The door lock is simply a device that controls the locking and functionality of the door.  This is machinery that allows the door to lock and open with a key. It is an important aspect of the door, without which the door is useless.

16. Latch


The latch can be described as a metal found within the lock. Pressing down your door handle, the metal that holds the door is referred to as a latch. It is crucial for the proper functioning of the Door lock.

17. Keyhole


The keyhole is simply the space in your lockset that allows you to insert your key, to be able to control the deadbolt, locking and unlocking the door.

18. Deadbolt


The deadbolt is controlled by the key. When the key is turned, the deadbolt leaves the lockset and enters the mortice. This keeps the door locked and only controllable by the required key.

19. Mortice


Mortice is simply the hole-found indoor frame. This is the hole where the deadbolt enters when the key is turned.

20. Strike plate

Strike plate

The Strike plate is simply a metal plate attached to the lock jamb, where the latch always makes contact. The metal plate prevents damages to the Jamb, especially in situations where the door opens and closes.

21. Centre Mullions

Centre Mullions

The centre mullion is responsible for dividing the door surface from the upper rail to the mid rail and also from the bottom rail to the mid-rail. Also, this helps with the overall structure of the door.

22. Weatherstripping


This helps to provide an airtight door. The weatherstripping surrounds the edges of the door jamb and header, making it weatherproof. This means improved and efficient energy consumption, as energy can be saved to prevent heat from leaving the house.

23. Astragal


An astragal can be found in most twin exterior doors.  It helps to cover the gap between the two doors, making the doors airtight. Astragal is found chiefly in exit room doors and exit discharge doors. They grant both entry access and exit access to persons.

24. Transom


Transom performs primarily decorative purposes. They can be found on top of a door. A transom is described as a small window that is located on top of the door.

25. Rail



Rails are primarily seen in sliding doors. It is the rail that makes way for the sliding door to move across.

26. Rollers


Rollers are attached to a hanger at the bottom of the sliding door. It allows the door to move along the rail. The roller makes it easy for the door to carry on the rails, preventing friction.

27. Center bearing

Center bearing

The center bearing can be found in garage doors. Center Bearing can be found in torsion springs. It helps to support the torsion bar from getting tangled by the center bracket and colliding with the springs as the door operates. They are mainly used at the end-bearing plates

28. Electrical protective devices

Electrical protective devices

These are devices whose primary function is to sustain electrical equipment and help prevent overcurrent and short circuits. They are primarily found in electric doors like electric garage doors, electric mall doors and refrigerators.

This control device helps to maintain the circuit breaker rating. This interrupting rating is current which the circuit breaker can interrupt, which causes an electric arc not allowed by National Electric Code (NEC).

29. Garage door torsion spring

Garage door torsion spring

The garage torsion springs are primarily found in garage doors. They are responsible for the movement of the garage door. When the garage door is closed, the spring stretches up and generates energy. And when the door is opened, it folds, and the power is stored.


Every door part plays an essential role in the functionality of a door. A proper understanding of your door means you can identify the features of a door correctly. It also means that you are better at maintaining the door well.

While many doors, like wooden, fibreglass, or steel doors, their parts are relatively the same. Knowing the part of your door also means you can better cut costs and maintain the door properly.

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