ISO 14586-C flat head sheet metal screw with torx (form C), ST5.5 x 32, Article number 14586C550321. Property class / material: steel, surface finish zinc plated. Flat Head Sheet Metal Screw with Torx manufactured to ISO 14586 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.