DIN 963 flat head screw with slot, M4 x 20, Article number 963T04020GRD5. Property class / material: titanium gr.5, surface finish plain. Flat Head Screw with Slot manufactured to DIN 963 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.