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The dimension of a nut is expressed in terms of:

  • A.Head of the bolt
  • B.Core diameter of bolt
  • C.Nominal diameter of bolt
  • D.Pitch diameter of bolt

Answer: C

A nut is specified by the nominal diameter of the bolt.

A nut is named after the bolt it fits: an M12 nut fits an M12 bolt, whose nominal (major) diameter is 12 mm. The nut's own dimensions, such as width across flats and thickness, are then set by standard proportions of that nominal diameter.

The core (minor) and pitch diameters are thread dimensions used in design and gauging, not in naming the nut. The head of the bolt has nothing to do with the nut's size.

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