Hex plugs are threaded fasteners with a hexagonal head, used to close or seal the ends of pipes, fittings, or ports. Designed for easy installation and removal with a wrench, they provide a leak-proof seal in plumbing, hydraulic, and pneumatic systems. Hex plugs are commonly made from materials like stainless steel, brass, or carbon steel, offering durability and corrosion resistance. They are ideal for maintenance, pressure testing, or temporarily blocking fluid or gas flow in industrial and mechanical applications.