A cylindrical pin of iron or copper to unite the different parts of a vessel, varied in form according to the places where they are required. In ship-building square ones are used in frame-fastening; the heads of all bolts are round, saucer, or collared.
♦ Bolt of the irons, which runs through three pairs of shackles.
♦ Drift or drive-bolts are used to drive out others.
♦ Bay-bolts, have jags or barbs on each side, to keep them from flying out of their holes.
♦ Clench-bolts are clenched with rivetting hammers.
♦ Fend or fender bolts, made with long and thick heads, and struck into the outermost bends of the ship, to save her sides from bruises.
♦ Forelock-bolts have at the end a forelock of iron driven in, to keep them from starting back.
♦ Set-bolts are used for forcing the planks, and bringing them close together.
♦ Ring-bolts are used for the bringing to of the planks, and those parts whereto are fastened the breeches and tackle of the guns.
♦ Scarp-bolts and keel-bolts, pointed, not clinched, used for false keel or temporary purposes.
♦ Bringing-to bolts, fitted with an eye at one end, and a nut and screw at the other, for bringing to the ends at the stem, &c.
♦ To bolt, to start off, to run away.