Door hinge factory today: The Flag hinge – This type of hinge is not very common. However, it is seen from time to time. Flag hinges are usually installed on PVC doors. The design of this hinge is unique. Instead of two hinges attached to the central joint, this hinge has a blade attached to the pin, which can have two blades, or more than two blades. The hinge is designed to rotate around the pin, giving the hinge a total range of 360 degrees. In very special cases, a…