among artificers, a kind of nails used in building, which have no spreading heads, as other nails have. They are distinguished, by iron-mongers, by six names, as joiner's-brads, flooring brads, batten-brads, bill-brads, or quarter heads, &c. Joiner's-brads are for hard wainscot, batten brads are for soft wainscot; bill-brads are used when a floor is laid in haste, or for shallow joists subject to warp. See NAIL.