DIN 980-M hexagon nut with clamping part (form M), M20 x 1.5, Article number 980M1020150COP. Property class / material: steel class 10, surface finish copper plated. Hexagon Nut with Clamping Part manufactured to DIN 980 with ISO metric (M) thread, fine 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.