A type of mechanical bearing formed between two parts allowing one to be rotated relative to the other e.g. door hinges.

Civil Engineering

In concrete structures, a point where the element is purposely reduced in size to such an extent that it is free or nearly free to rotate at that point. Sometimes an actual steel hinge is embedded in the concrete or the hinge is made by creating a plane of weakness in the concrete.

Ball Bearing Hinge

A hinge equipped with ball bearings between the hinge knuckles to reduce friction.

Butt Hinge

One leaf attaches to the door’s edge, the other to its jamb.

Clip on Hinge

Concealed hinge where the two parts of the hinge are attached by snapping them together.

Concealed Hinge

Hinge so constructed that no parts are exposed when the door is closed.

Exposed Hinge

Hinges that show on the outside when the door is closed.

Loose Joint Hinge

A hinge having only two knuckles, to one of which the pin is fastened permanently.

Loose Pin Hinge

Hinge having a removable pin to permit the two leaves of the hinge to be separated.

Piano Hinge

Designed to extend for the length of the moving part to which it is applied.

Strap Hinge

A surface hinge of which both leaves are of considerable length.

Surface Mount Hinge

Both leaves secured to the surface of the door and frame.

Swing Clear Hinge

Interior door hinge that allows the door to open completely clear of the door opening so that large equipment may pass through the opening of the door.


Surface hinge with the short member attached to the jamb and the long member attached to the door.

Wrap Around Hinge

Cabinet hinge that wraps around and attaches to the back edge of the door and/or the face frame offering extra strength.

See also: Ball Bearing Hinge, Bearing, Butt Hinge, Clip on Hinge, Concealed Hinge, Door, Exposed Hinge, Knife Hinge, Loose Joint Hinge, Loose Pin Hinge, Piano Hinge, Strap Hinge, Surface Mount Hinge, Swing Clear Hinge, T-Hinge, Wrap Around Hinge.

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Subjects: Mechanical Engineering