#bolt_shank__shank  cylinder forming the part of a bolt between the thread and the head
  supertype:  #cylinder.round_shape  a surface generated by rotating a parallel line around a fixed line
  part of:  #bolt.screw  a screw that screws into a nut to form a fastener
     part of:  #nut_and_bolt__nutandbolt  a fastener made by screwing a nut onto a threaded bolt

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