NSN 5305-01-331-9599

(all except usa) a headed externally threaded fastener whose threaded portion may extend on part or whole of its shank. The head is designed to be held or driven with a tool. The threaded portion is cylindrical and its diameter 1.6 mm or more. For items with diameters below 1.6 mm see screw, instrument. The item is designed to be driven in a preexisting mating screwthread or to accommodate a nut, insuring assembling of parts, with the part opposite the head acting as a nut, or insuring a grip between the bearing surface of its head and that of a nut screwed on its end. The threaded end may have a pilot for easier driving into a drilled hole. If the point is designed to prevent or restrict relative movements of parts see setscrew. Do not use if a more specific item name applies. If the item is furnished with attachments such as nut(s), washer(s), pin(s), and the like, see screw assembly or bolt (as modified).