DIN 988 round flat washer, 4 x 8 x 0.2 mm, shim ring, Article number 988SS301040802. Made in stainless steel aisi 301. Round Flat Washer manufactured to DIN 988. 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.