This low-profile hex nut is a thin jam nut with a reduced height, manufactured to DIN 439-2 and ISO 4035 standards. Made from steel with an electro-galvanized finish, it features metric threading. The 040 strength grade indicates a lower load capacity—this style is primarily used to keep other nuts from vibrating loose. The electro-galvanized coating is suitable for indoor applications or environments with very mild exposure.