ISO 4032 hexagon nut, M3.5, sst 72 h, Article number 403280353SST072. Property class / material: steel class 8, surface finish zinc plated, yellow passivated. Hexagon Nut manufactured to ISO 4032 with ISO metric (M) thread, coarse pitch, fully threaded. Standard parts to the same standard, property class, dimensions and surface finish are interchangeable between manufacturers; confirm the controlling standard revision, any class-society or application approval, and the mating thread before substitution.