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Types of Hinges for uPVC Doors If your uPVC door is dangling or falls it could be because of the hinges. To ensure your uPVC doors are operating smoothly, you may need to adjust the hinges or even replace them entirely. Hinges are made up of hinge leaves that are flat (or plates), knuckles, and the hinge pin. They allow for the lateral or compression adjustment. There are a variety of kinds and sizes of hinges. Each hinge has its own distinct characteristics to meet different requirements for installation. Bu