Galvanized coatings specified in this standard will be designated with the symbol Zn/GC. Example: The designation of a galvanized screw with a hexagonal head with a thread M 10 x 1.25 UNE 17-703 will be: Hexagonal screw M 10 x 1.25 UNE 17-703 - Zn/GC UNE 37-507