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A hinge is a device consisting of two interlocking metal pieces held by a pin around which they pivot. One half of the hinge is welded to the door pillar, and the other half welded to the door, so that it does not come loose with repeated opening and closing of the door.
A door hinge fastens the door to the wall and lets the door swing open. A hinge is a joint that holds two pieces of something together while allowing one piece to move in a swinging motion.
Hinges are simple mechanical bearing devices that are used to connect two parts and allow them to rotate relative to each other about a fixed axis. Depending on the type employed, the components can move (most commonly) within a limited arc or with 360° freedom.
Hinges are an excellent timber fitting and are used to make components such as doors or lids work. They are designed to be hinged onto two pieces of timber to create an opening and closing feature such as doors and they can support large amounts of weight.
The most common type of hinge used on doors is the butt hinge. It's so named because the two leaves are mortised into the door and frame, allowing the two to butt up to each other. There are three different types of butt hinges: plain, ball bearing, and spring-loaded.
Hinges for doors
Doors with a security function need to have at least 3 hinges, as this makes them more difficult to force. Fire Regulations require fire doors to be fitted with 3 hinges (which must be 4 inch fire certified hinges). For doors over 2200mm tall, then four hinges can be used to prevent warping.
As a rule, use one hinge per every 30 inches of door: Doors up to 60 inches need two hinges. Doors over 60 inches, but not over 90 inches, need three hinges. Doors over 90 inches, but not over 120 inches, need four hinges.
Ball bearing hinges are considered heavy-duty and durable, making them ideal for entry doors.
Three door hinge types