DIN 432 external tab washer, 17 mm, Article number 432170. Property class / material: steel, surface finish plain. External Tab Washer manufactured to DIN 432. 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.