DIN 6799 retaining washer, 4 mm, Article number 6799SS42004. Made in stainless steel aisi 420. Retaining Washer manufactured to DIN 6799. 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.