This low-profile hex nut, manufactured to DIN 439-2 and ISO 4035 standards, is a thin jam nut with a reduced height, produced in strength class 040. Due to its lower load capacity, it's primarily used to lock other nuts in place and prevent them from vibrating loose. The nut is made from steel and hot-dip galvanized—a surface treatment favored for steel structures and outdoor applications where long-term protection and minimal maintenance are essential. The metric thread is manufactured to tolerance class 6H and is tapped after galvanizing, which leaves the thread itself uncoated. Pair this nut with externally threaded fasteners in tolerance class 6az prior to galvanizing; the zinc coating on the mating part will protect the thread from corrosion.