Hinges
Hinges are mechanical joints that connect two objects allowing relative rotation about a fixed axis. They are used to attach doors, lids, and gates to frames, boxes to lids, and many other applications where a controlled pivot is required. They typically consist of two leaves, a pivot pin, and knuckles that interlock to form a joint; some designs include sleeves or barrels to enclose the pivot.
Common hinge types include butt hinges, which are two rectangular leaves with knuckles; continuous or piano
Design considerations include load capacity, door weight and size, clearance and alignment, corrosion resistance, and the