DIN 137-B wave washer (form B), 3.7 x 7 x 0.4 mm, Article number 137BA2037. Made in stainless steel a2. Wave Washer manufactured to DIN 137. 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.