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A screw is a fastener with a pre-formed external thread that is screwed into a matching internal thread (such as a machined threaded hole or nut) or into a thread formed by the connected parts themselves, thereby achieving the fastening, positioning, or sealing of two or more parts. Its structure typically consists of a head (providing a driving and bearing surface), a shank (partially or fully threaded), and a tip. Due to its wide variety of types, flexible assembly, removability, and high reliability, screws have become one of the most versatile and essential fastening solutions in mechanical equipment, electronic products, building structures, and everyday items.
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