DIN 125-A round flat washer (form A), 17 x 30 x 3 mm, Article number 125170HV300. Property class / material: steel 300 hv, surface finish plain. Round Flat Washer manufactured to DIN 125. 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.