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foehl fasteners cut one or more cutting slots at the end of the thread, allowing the tail and threads of the screw to cut matching internal threads in a manner similar to a tap when screwed into a pre-drilled hole. It can be used on thick plates, relatively hard or brittle materials that are difficult to form. Self-tapping screws are screws with drill bits, constructed using specialized power tools to complete drilling, tapping, fixing, and locking in one operation. Self-tapping screws are mainly used for connections such as between color steel plates and purlins, etc. These self-tapping screws are often exposed outdoors and have their own