This low-profile hex nut is manufactured to DIN 936 standards from plain steel—steel without any coating or surface treatment. While the material is strong, it offers little natural resistance to corrosion. The nut has a hardness class of 14H, indicating a minimum hardness of 140 HV; no proof load is specified for this class. It features a metric left-hand (LH) thread, a design primarily used with clockwise-rotating components to prevent loosening.