From International Dictionary of Marine Aids to Navigation
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Cylindrical bar with square or hexagonal head, threaded at one end to receive a nut.

The threaded section does not continue as far as the head. A bolt is a commonly used fixing for joining metal parts.

Note: 1 The French term boulon is also used for the combination of a nut and bolt.

Note: 2 The term set screw and the French term vis calante are used when the threaded part continues as far as the head.

Note: 3 The term stud applies to a set screw without a head.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)