DIN 964 raised countersunk head screw with slot, M4 x 50, fully threaded, Article number 964040501. Property class / material: steel 4.8, surface finish zinc plated. Raised Countersunk Head Screw with Slot manufactured to DIN 964 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.