DIN970 ISO4032 Hexagon nuts ISO-type 1 ISO-type 2
coarse thread or fine thread
DIN 970 Hex Nut, style 1 by Material, Finish and Size Finished Hex nuts are hexagonal, internally threaded fasteners, mated with bolts, studs, screws, and other externally threaded products. The purpose of a hex nut is to ensure that the bolt, etc., stays in place. Hex nuts of standard thickness are called finished hex nuts.