#screw  a fastener with a tapered threaded shank and a slotted head
  supertype:  holdfast__fastener__fastening  restraint that attaches to something or holds something in place
  part:  head.projection  screw_thread
  subtype:  Allen_screw  a screw with a hexagonal hole in the head
  subtype:  bolt.screw  a screw that screws into a nut to form a fastener
     subtype:  carriage_bolt  a round-headed bolt for timber; threaded along part of the shank; inserted into holes already drilled
     subtype:  expansion_bolt__expansionbolt  a bolt that has an attachment that expands as the bolt is driven into a surface
     subtype:  kingbolt__kingpin__swivel_pin  bolt that provides a steering joint in a motor vehicle
     subtype:  machine_bolt__machinebolt  a bolt with a square or hexagonal head on one end and a threaded shaft on the other end; tightened with a wrench; used to connect metal parts
     subtype:  stove_bolt__stovebolt  a small machine bolt
  subtype:  cap_screw__capscrew  a threaded screw for machine parts; screws into a tapped hole
  subtype:  machine_screw__machinescrew  a screw used either with a nut or with a tapped hole; slotted head can be driven by a screwdriver
  subtype:  metal_screw__metalscrew  screw made of metal
  subtype:  Phillips_screw  (trademark) a screw with a special head having crossed slots
  subtype:  thumbscrew  screw designed to be turned with the thumb and fingers
  subtype:  woodscrew  a metal screw that tapers to a point so that it can be driven into wood with a screwdriver
     subtype:  lag_screw__lagscrew__lag_bolt__lagbolt  a heavy woodscrew with a square or hexagonal head that is driven in with a wrench
     subtype:  screw_eye__screweye  a woodscrew having its shank bent into a ring
  subtype:  worm.screw  screw thread on a gear with the teeth of a worm wheel or rack

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