A Lock Former is a sheet metal fabrication machine used to form interlocking edges, seams, and profiles on ducting and sheet metal components. It creates precise mechanical locks such as Pittsburgh seams, snap-locks, and other folded joints required for HVAC ductwork and general sheet metal assembly. Commonly used in HVAC manufacturing, fabrication shops, and industrial sheet metal workshops, lock formers are valued for their accuracy, efficiency, and ability to produce consistent, airtight joints for ducting and enclosure applications.