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Types of Hinges for uPVC Doors If your uPVC door is dangling or falls it could be because of hinges. You may need to replace or adjust the hinges of your uPVC door to allow it to function smoothly. Hinges consist of hinge leaves (or flat plates), knuckles and a hinge pin. They permit lateral and compression adjustments. Butt Hinges There are a variety of types and sizes of hinges. Each hinge has its own distinctive features to meet different installation needs. Butt hinges add strength and durability to