DIN 6923-Z flange nut, M16 x 1.5, sst 720 h, serrated, Article number 6923Z1016150GEO720. Property class / material: steel class 10, surface finish geomet silver. Flange Nut manufactured to DIN 6923-Z with ISO metric (M) thread, fine 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.