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a-series spares fastener self-tapping screws are thread-forming screws made of hardened steel with a A type tip, 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 fasteners with galvanized and passivated surfaces for quick installation. Self-tapping screws are mostly used for connections between thin metal sheets (steel plates, sawn plates, etc.). When connecting, first create a threaded pilot hole in the components to be connected, then screw the self-tapping screw into the threaded pilot hole.