DIN 988-S round flat washer, 15 x 22 x 1.5 mm, supporting ring, Article number 988SA4152215. Made in stainless steel a4. Round Flat Washer manufactured to DIN 988-S. 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.