DIN 127-A spring lock washer (form A), 20.2 x 33.6 x 4 mm, Article number 127A22021. Property class / material: steel 420-490 hv, surface finish zinc plated. Spring Lock Washer manufactured to DIN 127. 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.