What ia the screw and how many types of screw
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Screw Head Types. Screws come with different types of heads, including the flat head (-) and Phillips head (+), as well as hex head (shaped like a hexagon), and Torx head (shaped like a six-pointed star).
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A screw and a bolt are similar types of fastener typically made of metal, and characterized by a helical ridge, known as a male thread. Screws and bolts are used to fasten materials by the engagement of the screw thread with a similar female thread in the matching part
36 Types of Screws .
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