Below is a list of Weld On Hinges manufacturers from South San Francisco, California. Weld on hinges are small hinges that connect two separate metal parts, typically doors and door frames, while still allowing for up to 180 degrees of swinging movement. They are sometimes also called bullet hinges, barrel hinges or lift-off hinges. Weld on hinges offer high control quality and are typically used in heavy duty industrial applications such as steel cabinets, electrical boxes, steel gates, machinery doors, transformer enclosures and tool boxes.