DIN 7980 spring lock washer, 3.1 x 5.6 x 1 mm, Article number 7980031. Property class / material: steel, surface finish plain. Spring Lock Washer manufactured to DIN 7980. 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. Applications: load distribution and locking under bolt heads and nuts in machine building, structural steel, plant maintenance and marine outfitting.