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federnfabrik subtil Fastening screws are a common type of fastener, widely used in machinery, electrical equipment, and buildings. Currently, standard parts on the market are mainly made of three materials: carbon steel, stainless steel, and copper. We distinguish low-carbon steel, medium-carbon steel, high-carbon steel, and alloy steel based on the carbon content in carbon steel materials. Cylindrical in shape, with grooves carved on the surface that are raised and recessed, these are called threads. It is a tool that gradually tightens objects and mechanical components by utilizing the physics and mathematics principles of inclined plane circular rotation and friction. Screw is the general term for fasteners. The principle of a screw is