DIN 7976-C hexagon head sheet metal screw (form C), ST3.5 x 19, Article number 7976C350191. Property class / material: ch, surface finish zinc plated. Hexagon Head Sheet Metal Screw manufactured to DIN 7976 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.