DIN 84 rounded head screw with slot, M5 x 55, fully threaded, Article number 84050551. Property class / material: steel 4.8, surface finish zinc plated. Rounded Head Screw with Slot manufactured to DIN 84 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.