This ISO 4033 hex nut has a height equal to its diameter (H = 1xD) and is made from plain steel—steel without any coating or surface treatment. It's a strong material, but on its own it offers very little protection against corrosion. Rated at strength class 12, this nut pairs well with bolts and screws of strength class 12.9 or lower. It features a metric thread and is manufactured to the ISO 4033 standard.