A – KNUCKLE

The hollow circular part at the joint of a hinge through which a pin is passed. Sometimes called loop, join, node, or curl.

B – HINGE WIDTH

The overall dimension of the leaves measured perpendicular to or across the pin.

C – KNUCKLE LENGTH

The nominal or typical dimension of the knuckle measured parallel to the pin.

D – HINGE LENGTH

The length of the leaves measured parallel to the pin.

E – LEAF WIDTH

The dimension from the center of the pint to the outer edge of the leaf.

F – PAINT CLEARANCE

The minimum dimension between the outer face of the knuckle and the opposing edge of the leave cutout over the entire range of the pivotal movement of the hinge.