DIN 127-B spring lock washer (form B), 5.1 x 9.2 x 1.2 mm, Article number 127051GEO500B. Property class / material: steel 420-490 hv, surface finish zinc flake, silver. 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.