Features Use a hex nut with a screw or hex head bolt to fasten two or more wood or metal parts. Hex nuts are often used in construction for framing or to create a bolted joint. Nut Style / Hex Nut System of Measurement / Inch Basic Material / Nickel Copper Alloy Fastener Finish / Plain Fastener Thread Direction / Right Hand Dia./Thread Size / 5/16"-18 Fastener Thread Type / UNC (Coarse) Width Across Flats / 1/2 in Nut Height / 17/64 in Nut Standards / ASME B18.2.2