This low-profile hex nut, manufactured to DIN 439-2 and ISO 8675 standards, is made of steel with an electrolytic zinc-plated finish, making it suitable for indoor use or applications with very mild exposure. Rated at strength class 040, it's a thin jam nut with reduced load capacity, designed to keep other nuts from vibrating loose. It features a metric fine thread with a left-hand (LH) orientation, which is primarily used on clockwise-rotating components to prevent them from backing off.