DIN 7981-C rounded head sheet metal screw with phillips or pozidriv, ST3.5 x 25, pozidriv, Article number 7981C350251Z. Property class / material: steel, surface finish zinc plated. Rounded Head Sheet Metal Screw with Phillips or Pozidriv manufactured to DIN 7981-C 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.