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ISO - International Organization
for Standardization

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Hinge Terms

Back Angle – The angle of the leaves, usually a minimum of 270¼, when the hinge is completely open.
 
Bent Pin – A hinge pin containing a bent end to allow for easy removal of the pin.
 
Closed – Refers to the position of the leaves when they are parallel and together at the 0¼ position.
 
Coined Pin – A deformed end of a pin that causes the pin to be wedged into place when driven into the hinge.
 
Crimped Ends – A hinge pin that can not be removed due to depression of the hinge knuckle.
 
Detent – A device that locks a hinge in the open position.
 
End Play – The extent to which hinge leaves move axially.
 
Flat – Refers to the position of the leaves when they are at the 180¼ position.
 
Gauge – Hinge measurement reflecting the hinge leaf thickness.
 
Hinge Length – The measurement of the hinge running parallel to the hinge pin from one end of the leaves to the other end of the leaves.
 
Hinge Width – Also known as “open width,” it is the measurement of the width of the entire hinge, including both leaves and the pin. Hinge width is a measurement perpendicular to the hinge pin.
 
Knuckle – Also referred to as “joint,” “node,” “curl” and “loop,” it is the individual, hollow joint of a hinge through which the hinge pin is inserted.
 
Knuckle Length – The length of an individual knuckle, equivalent to one-half of the pitch.
 
Leaf – Hinge component that remains perpendicular to the pin.
 
Leaf Width – The measurement from the pin to the end of the leaf.
 
Offset – The process of decreasing leaf width through the formation of the hinge leaf away from the hinge pin center.
 
Paint Clearance – The amount of space between the knuckle and the edge of the leaf in every position of the hinge during operation.
 
Pin – The rod inserted through the hinge knuckles to hold the hinge in place.
 
Pitch – The measurement reflecting the distance between the opposite ends of two adjacent knuckles.
 
Side Play – The amount of leaf movement perpendicular to the pin.
 
Spun Ends – Hinge pin ends that have been peened, or flattened, in order to prevent pin removal. Although a pin with both spun ends is not removable, a pin containing only one spun end is still removable.
 
Staked Pin – A hinge pin that is not removable due to the staking of the hinge backside.
 
Stop Hinge – A type of hinge intended to provide a limitation on the angle of the hinge leaves to a particular degree.
 
Swaging – A process of increasing hinge leaf width through the formation of the hinge leaf or leaves either toward or away from the hinge pin center.
 
Welded Pin – A type of pin in which the splined portion is slightly larger than the inside diameter on the curl of the pin. Welded pins are used in some slip joint hinges.