DIN 7504-M rounded head self-tapping screw with phillips, ST3.9 x 16, phillips, Article number 7504NA239016. Made in stainless steel a2-20h. Rounded Head Self-Tapping Screw with Phillips manufactured to DIN 7504-M with ISO 1478 tapping screw thread (ST) 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.