Differentiation between bolt and screw

  A bolt is an externally threaded fastener designed for insertion through holes in assembled parts, and is normally intended to be tightened or released by torquing a nut. A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, of mating with a preformed internal thread or forming its own thread, and of being tightened or released by torquing the head. 

Types of screws

  • Wood Screws Screws with a smooth shank and tapered point for use in wood. 
  • Machine Screws Screws with threads for use with a nut or tapped hole. 
  • Thread Cutting Machine Screws  Machine screws with a thread cutting (self tapping) point. 
  • Sheet Metal Screws Fully threaded screws with a point for use in sheet metal. 
  • Socket Screws Socket screws, also known as Allen Head, are fastened with a hex Allen wrench.
  • Set Screws Machine screws with no head for screwing all the way into threaded holes.
  • Mating Screws Mating screws have a shoulder that matches the diameter of the sex bolts they are used with. 

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