Hinges

About hinges

Hinges are mechanical bearings that connect two solid objects, typically allowing only a limited angle of rotation between them. The primary function is to facilitate the opening and closing of doors, panels, or lids. Common types include butt hinges, which are characterized by two leaves joined by a pin and knuckle, and piano hinges (also known as continuous hinges), which are extended butt hinges providing support along the entire length of a panel. Concealed hinges, such as European-style cup hinges, offer a clean aesthetic by hiding the hinge mechanism when the door is closed. Weld-on hinges are designed for heavy-duty applications where direct welding to metal structures is required, often found in industrial enclosures or gates. Heavy-duty industrial hinges are engineered for high load capacities and frequent use, often featuring robust materials and larger pin diameters. Selection criteria typically involve load capacity (static and dynamic), required angle of opening, mounting configuration (e.g., surface mount, mortise, weld-on), and environmental resistance. Dimensions such as leaf length, width, thickness, pin diameter, and knuckle length are critical for fitment. Common materials include steel (carbon, stainless), brass, aluminum, and various plastics, with finishes such as zinc plating, powder coating, or polished chrome for corrosion resistance and aesthetics.