Screws, nails and bolts

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  • Screws, bolts and nails
    • Screws
      • Machine screws
        • Partially straight shank
        • Used with washers and nuts
        • Screwdriver or Allen key used
      • Woodscrews
        • Require pilot holes
        • Screwdriver used
        • Different types of head available
          • round
          • countersunk
          • slotted
          • cross
      • Self-tapping screws
        • Hardened threads
        • Cut own threaded holes
        • Metal and hard plastics
    • Bolts
      • Similar to machine screws
      • Tightened with a spanner
      • Square or hexagonal head
    • Nails
      • Straight shank, no thread
      • Hammer
      • Quicker to use than screws but not as strong
      • Most are made from steel
    • Threading
      • A method of fastening machine screws and bolts to metal or plastic without using nuts
      • 1) A hole is drilled and a tap is used to cut a female thread in the hole
        • 2) a male thread is cut onto a rod using a 'split die' or lathe


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