DIN 6319-C spherical washer, 25 mm, Article number 6319C257. Property class / material: steel, surface finish black oxide. Spherical Washer manufactured to DIN 6319-C. 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.