#nut.block  a small square or hexagonal metal block with internal screw thread to be fitted onto a bolt
  supertype:  block  a solid piece of something (usually having flat rectangular sides); "the pyramids were built with large stone blocks"
  part of:  nut_and_bolt
  subtype:  hex_nut__hexnut  a nut with a hexagonal shape
  subtype:  locknut__safetynut  supplementary nut that is screwed down on a primary nut to prevent it from loosening
  subtype:  square_nut  nut with a square shape
  subtype:  stuffing_nut__packing_nut__packingnut  a nut used to tighten a stuffing box
  subtype:  wing_nut__wing_screw__thumbnut  nut with winglike projections for thumb and forefinger leverage in turning

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