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A screw is a common mechanical fastener, typically made of metal or plastic, consisting of a head, shank, and helical threads. By rotational driving (e.g., with a screwdriver or wrench), the screw engages with internal threads in a hole or a nut, generating axial force to securely join two or more objects. Screws come in various types: head styles include round, flat, and hexagonal; drive types feature slotted, Phillips, Torx, etc.; functional designs encompass self-tapping screws, machine screws, anchor screws, and more. Due to their easy installation and removability, screws are widely used in machinery manufacturing, construction, electronics.
