Below is a list of Hinges manufacturers from Covina, California. Hinges are a type of bearing used to join two objects and allow for their motion relative to each other. Hinges are everywhere. Simple butt hinges are used to suspend doors all over the world; they are among the most common door hinge varieties. Cabinet hinges of all shapes, sizes and compositions allow for the opening and closing of cabinets in homes, offices, factories and even on vehicles like boats and airplanes. Gate hinges are key components in securing private property and places of business. Friction hinges are used to keep laptop screens steady, vehicle sun visors stable and loading bay doors open.