Self-Tapping screw is one of the threaded fasteners that can drill the female thread in the pre-drilling of metal or non-metallic materials.
and self-tapping screw
Drywall screw: the biggest feature in appearance is the trumpet head shape. The thread of single thread thick thread dry wall screw is wider. Phosphating dry wall screw is the most basic product line, while blue-white zinc dry wall screw is a supplement. The scope of application and purchase price of the two are basically the same
Self tapping screw: the materials can be divided into carbon steel and stainless steel two types. For the carbon material, 1022 medium carbon steel is the main material. It is usually used in doors, windows and iron sheets.
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