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 five names; as joiner's brads, flooring-brads, batten-brads, bill brads, or quarter-heads, &c. Joine-brads are for hard wainscot; batten-brads are for soft wainscot; bill brads are used when a floor is laid in halts, or for shallow joists subject to warp. See Nail.