#bolt.screw  a screw that screws into a nut to form a fastener
  supertype:  screw  a fastener with a tapered threaded shank and a slotted head
  part:  head.projection  bolt_shank
  part of:  nut_and_bolt
  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

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