Door Terminology – Every door is actually composed of 3 basic components. The door slab, jambs, and casings. Doors are hinged on a jamb which is considered an essential part of the door. The jamb is in its turn fastened to a wall opening. The gaps between the jamb and the wall-opening are covered by specific longitudinal elements called casings which create a frame for the door slab. The final elements are the specially designed accessories: handles, the lockset, and hinges.


Door Terminology

Composite panel doors are the most common and popular door products nowadays because of its stable performance and reasonable price. Here below you can find the typical structure for it.

Composite panel door structure

Composite panel door section

Get Knowledge About Wood Door Terminology

Adjustable Frame
A threshold that may be adjusted up or down in order to customize a doors seal for different types of weather or humidity.

Bevel Of Door
The angle of a door’s edge to the outer surface of its stile. The typical bevel is 1/8″ in 2″.

Beveled Glass
Glass which has had the edge of one face ground down at an angle along the perimeter in order to create a better fit. Casing A decorative wood paneling attached to the interior edge of a window or door frame. It covers the gap where the door frame meets the wall.

Contains the tumbler and keyhole of a lock. This is the part of the lock into which the key is fit.

Door Panel
The leaves of the full door, attached to the frame.

Door Stop
The part of the frame upon which the door panel rests when closed. It limits the door’s opening swing.

Floor Clearance
A measure of the space between the floor and the bottom of the door.

The surrounding edge of the door to which the door panel is attached. Includes the head, threshold and jambs of the door.

Hand Or Handing
Describes direction door opens and placement of the handle. When looking at a door from the outside, it is a right hand door when the handle is on the left; it is a left hand door when the handle is on the right. This is reversed if the door swings out.


The plates and pins used to attach the door panel to the frame allowing the door to swing open.

The vertical component of a door frame. Different types include the hinge jamb, upon which the hinges are attached, the strike jamb, upon which the strike is installed, and a blank jamb, which is not prepared for either a hinge or a strike plate.

Knocked Down
Indicates that the product has been pre-assembled at factory, then subsequently unassembled and must be assembled on site.

Mortise/Tenon Construction
A way of locking two wood pieces together to form a tighter bond.

The vertical post dividing a door opening.

Opening Size
The measure of the door frame’s opening. Measured from the floor to the head rabbet vertically and between the jam rabbets horizontally. Being larger than the actual size of the door itself: it also includes room for clearance.

A piece of wood or glass placed into openings in a wood door. A leaf placed inside the stiles and rails held in by molding. Hence the door style names: Flat Panel, Raised Panel and Glass Panel.

A full unit with the door hinged and an assembled jamb, frame, sill and casing.

The coating applied before a coat of paint or finish.

The portion of the door frame the door panel is fit into.

Horizontal sections of the door between stiles (top, cross or intermediate, lock, and bottom).

Two outer vertical pieces/edges of the door.

Strike plate
The plate that covers the latch and deadbolt of a lock. Used to protect the jamb.

A door which opens inwards into the house.

A door which opens out from the house.

Tempered Glass
Glass that has been heated and cooled so that it shatters into small pieces when broken. Sometimes referred to as safety glass.

The bottom piece of the door frame usually constructed of aluminum.