Self-tapping screw is a kind of screw with relatively sharp top, deep thread and large pitch. It is constructed by special electric tools, drilling, tapping, fixing and locking are completed at one time. Self-tapping screws can "tap, drill, squeeze, and press" the corresponding threads on the solidified body on the soft material and rely on its own threads to make them fit closely with each other. Connection of thinner metal sheets.

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