Screws with machine threads for use with a nut or in a tapped hole.īolts with no drive and machine threads for use with a nut. Also known as hex cap screws or machine bolts.įlange bolts have a flange on the bottom of the head that distributes the load like a washer. Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass or wood.īolts with hexagonal heads and machine threads for use with a nut or in a tapped hole. Screws with a smooth shank and tapered point for use in wood.