Hinge Terminology

A. LEAF WIDTH – the dimension from the center of the pin to the outer edge of the leaf.

B. KNUCKLE LENGTH – the nominal or typical dimension of the knuckle measured parallel to the pin.

C. HINGE LENGTH – the length of the leaves measured parallel to the pin.

D. HINGE WIDTH – the overall dimension of the leaves measured across the knuckle.

E. END PLAY – the amount of axial movement between the leaves.

F. PITCH – the dimension from a point on the knuckle to the same point on an adjacent knuckle on the same leaf.

G. PAINT CLEARANCE – the minimum dimension between the outer face of the knuckle and the opposing edge of the leaf cut out over the entire range of pivotal movement of the hinge.

Piano Hinge Descriptions

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