ISO 7380-2 button head with hex drive and flange, M6 x 20, with flange, Article number 73802A406020/20. Made in stainless steel a4-70. Button Head with Hex Drive and Flange manufactured to ISO 7380-2 with ISO metric (M) thread, coarse pitch, fully threaded. 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.