Hillman 4-1/2" Steel Square Corner Weldable Surface Full Hinge w/Fixed Pin is a heavy-duty hinge designed for secure surface mounting on metal surfaces through welding. This weldable surface hinge features a fixed pin for added security and eliminates the need for mortising, making installation straightforward and efficient. It is built to support a safe working load of up to 180 pounds with two hinges and 270 pounds with three hinges, ensuring reliable performance for your doors. Model Number: