The term ‘butt hinge’ refers in a general sense to simple, flat hinges. These hinges are not persistent. Nor do these hinges have folds or other constructive peculiarities.
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The hinge knuckle is the circular part. Also called bead or loop. The knuckles of the two different clasps usually alternate around the pen.1 of 10 Pin
The pin connects the two (or more) hinge leafs.2 of 10
The pin diameter determines the thickness of the pin, measured in diameter.3 of 10 Leaf
The leaf or blade of the hinge is the rotating or fixed part of a hinge.4 of 10
The leaf width is the distance from the end of the leaf to the center of the pin.5 of 10
The leaf thickness is the thickness of the hinge.6 of 10
The hinge width is the total width of the open hinge: measured at right angles to the pin.7 of 10
The knuckle length is the length from one end to the other end of a single knuckle, parallel to the pin. Usually this is a fixed size, e.g. 30mm, 25mm, 20mm, etc.8 of 10
The end play is the light axial movement between the knots over the axis of the pen. This is caused by the small space between the nodes, which causes the leaf to hinge.9 of 10
The hinge length is the total length of the hinge measured over the leaf parallel to the pin.10 of 10