DIN 6923-Z flange nut, M4, serrated, Article number 6923Z80433-. Property class / material: steel class 8, surface finish zinc plated, yellow passivated. Flange Nut manufactured to DIN 6923-Z 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.