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scherdel herckelbout fasteners self-tapping screws are thread-forming screws made of hardened steel with a type A point, used to connect sheet metal ducts in heating and ventilation systems. Therefore, they are also known as: sheet metal screws. Thread-forming self-tapping screws, thread-cutting self-tapping screws, thread-rolling self-tapping screws, and self-drilling self-tapping screws, also known as quick-thread screws, are steel fast-installation fasteners with a galvanized and passivated surface. Self-tapping screws are mostly used for connections between thin metal sheets (steel plates, sawn plates, etc.). When connecting, first prepare the