DIN 7981-F rounded head sheet metal screw with phillips or pozidriv, ST3.5 x 13, phillips, Article number 7981FA235013. Made in stainless steel a2-20h. Rounded Head Sheet Metal Screw with Phillips or Pozidriv manufactured to DIN 7981-F 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.