DIN 128-A spring lock washer (form A), 3.1 x 6.2 x 0.7 mm, Article number 128APB31. Surface finish: plain. Spring Lock Washer manufactured to DIN 128. 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.