Hinge Terminology

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HINGE TERMINOLOGY

WIDTH:
The overall dimension of a hinge edge to edge, opened to flat position, across the knuckle. LEAF WIDTH is measured from the center of the pin to the outer edge of the leaf.

WIDTH RESTRICTIONS:
In determining the maximum width of a given leaf in a hinge, the maximum hinge width must be divided by 2.

LENGTH:
The dimension of a hinge measured along the pin.

PART CLEARANCE:
The minimum dimension between the outer face of the knuckle and the opposing edge of the cutout over the entire range of pivotal movement of the hinge. This may also be measured from the center line of the pin to the cutout in the opposite leaf.

KNUCKLE LENGTH:
The nominal or typical dimension of a knuckle. The exact knuckle length is slightly less than the nominal dimension, and the space in the opposite leaf is slightly over this dimension. This allows for ease of rotation without excessive play.

PITCH:
The overall length of two adjacent knuckles.

TYPES OF LEAVES:

Plain type - not Swagged - Barrel
sets above the leaves which are flat
or horizontal when opened.

Reverse Swag - Where one leaf is formed with the effect of reverse hinge assembly. Leaves cannot be closed to lay parallel.

Swaging - A method of forming either or
both leaves up to or beyond, one half
the pin diameter.

Offset - Where either or both leaves are formed away from the outside of the pin. When closed in parallel position the distance between the leaves measures larger than the diameter of the pin.

One Leaf Half Swaged - Where only
one leaf is formed up to one half the pin
diameter.

Both Leaves Half Swaged - Each leaf is formed to one half the pin diameter leaving minimum clearance between them when closed.

One Leaf Full Swaged - Where one leaf is formed around to the full pin diameter. When closed both leaves are parallel.

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