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Understanding Door Hinge Pins: A Comprehensive Guide Door hinge pins play a necessary yet often overlooked function in the performance of doors. In spite of being small in size, these pins are critical in securing the door to its frame and enabling it to swing open and closed smoothly. This post dives into the different types of door hinge pins, their functions, installation treatments, and typical issues connected with them. What Are Door Hinge Pins? Door hinge pins are cylindrical rods placed through the knuckles of a hin