Hinge Terminology

We've found that for large and small needs alike, it's important to be equipped with an excellent understanding of the hinge terminology associated with industrial type hinges.

· The thickness of a hinge leaf.
· Rod running the length of the hinge. The pin holds the leaves of the hinge together.
Knuckle Length
· The nominal or typical dimension of the knuckle measured parallel to the pin.
· The hollow circular part at the joint of a hinge through which a pin is passed. The knuckle is often called a loop, joint, node or curl.
Hinge Length
· The length of the leaves measured parallel to the pin.
Hinge Width
· The overall dimension of the leaves measured perpendicular to, or across, the pin. (same as open width).
End Play
· The amount of axial movement between the leaves.
· The dimension from a point on the knuckle to the same point on an adjacent knuckle on the same leaf.
· The portion of a hinge extending laterally from the knuckle and which usually revolves around a pin.
Leaf Width
· The dimension from the center of the pin to the outer edge of the leaf.
Paint Clearance
· The minimum dimension between the outer face of the knuckle and the opposing edge of the cutout over the hinge's entire range of pivotal movement.
Plain or Standard Assembly
· This is a surface-type hinge. The leaves lie flat in the same plane when in the open position. Unless otherwise indicated, this type of hinge will be furnished.

· The forming of one or both leaves toward or beyond the center of the pin, swaging slightly increases leaf width.

Both Leaves Half-Swaged
· Both leaves are swaged approximately one-half the pin diameter with a minimum clearance between leaves when parallel.

One Leaf Half-Swaged
· One leaf swaged one half the pin diameter.
One Leaf Full-Swaged
· One leaf swaged equal to the pin diameter and both leaves parallel when in a closed position.

Reverse Swaged
· One leaf swaged to simulate reverse assembly. Leaves will not close to a parallel position.
· Forming one or both leaves away from the center of the pin. Offsetting slightly decreases leaf width.

Stop Hinge
· A hinge manufactured to limit the travel of the leaves to a specified angle.

Inside Stop Hinge
Leaves will open from a closed position, leaves parallel to each other, to a stop angle as specified.

Outside Stop Hinge
· Leaves move from an open or flat position and stop at a specified angle.