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  1. Fastening: The primary function of a screw is to join two or more objects together by exerting axial force when rotated into a threaded hole or nut.
  2. Threaded Design: Screws have a threaded shaft that allows them to be inserted into a threaded hole or nut. The threads engage with the mating threads in the hole or nut, creating a secure connection.
  3. Materials: Screws are typically made from metals such as steel, stainless steel, brass, or aluminum. They can also be made from plastic or composite materials for specialized applications.
  4. Applications: Screws are used in a wide range of applications, including construction, woodworking, automotive, electronics, aerospace, and more. They are versatile fasteners suitable for joining different materials such as metal, wood, plastic, and composites.
  5. Sizes and Specifications: Screws come in various sizes, lengths, and thread pitches to accommodate different applications and load requirements. They are often specified by diameter, thread pitch, and length.
  6. Installation: Proper installation of screws involves selecting the correct screw size, driving them straight into the material, and applying the appropriate torque to achieve the desired clamping force without damaging the material or stripping the threads.