Self tapping screw is a kind of screw, with a bit through a dedicated electric tool construction, drilling, tapping, fixed, lock Tapping screw.At one time.Tapping screw sheet is mainly used in some parts of connection and fixed, such as choi steel connection with choi steel, color steel plate and purlin, wall beam connections, etc., its penetration is generally not more than 6 mm, maximum of no more than 12 mm.Tapping screws are often exposed to outdoor, itself has a strong corrosion resistant ability;The rubber sealing ring can guarantee screw place don't ooze water and has good corrosion resistance

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