Hinge Terminology


Barrel – The portion of a hinge formed by knuckles of the door leaf and side panel leaf when joined by the pin.

Door Wing – In a five-knuckle hinge, it is the hinge leaf that is mounted to the door. It has two knuckles.

Flush – A solid door that sits within the cabinet opening so that the front surface of the door is even with the front of the cabinet side panel.

Hospital Tip – A hinge barrel whose ends are beveled towards each other.

Inset – Regarding Wire Doors: The wire door sets or rests inside the cabinet opening with the vertical wire members flush with the side panels. See Flush.

Knuckle – The curled hollow portion of a hinge through which the hinge pin is inserted. Also known as a curl.

Leaf – The segment of the hinge extending outward from the knuckle, which rotates around the hinge pin.

Lipped – A door with a rabbet cut around the back edge of the door’s perimeter. The back portion of the door recesses into the cabinet. The remaining front part of the door will overlay the cabinet side panel.

Non-Removable Pin – A hinge pin secured by a knurl on the pin and spun on both ends or by other means.

Onset – Regarding Wire Doors: The wire door frame sets or rests in front of the side panels.

Overlay – A door, which is mounted to the front of the cabinet and covers a portion of the cabinet side panel.

Pin – A rod or wire form that is inserted through the hinge knuckles to join two hinge leaves.

Reveal – In an overlay door mounting application, the exposed portion of the cabinet side panel not covered by the door when closed.

Side Panel Wing – In a five-knuckle hinge, it is the hinge leaf that is mounted to the cabinet side panel. It has three knuckles.

Side Play: The amount of movement of the leaves perpendicular to the axial centerline of the pin. Caused by excessive clearance between the pin and the inside diameter of the knuckle.

Swaging: Forming one or both leaves toward or beyond the centerline of the pin. Swaging reduces the distance between the leaves when the hinge is closed to a parallel position.