Portugal Exports of screws, bolts, nuts, coach screws, screw hocks, rivets, of iron or steel to Chad was US$1 during 2018, according to the United Nations COMTRADE database on international trade. Portugal Exports of screws, bolts, nuts, coach screws, screw hocks, rivets, of iron or steel to Chad - data, historical chart and statistics - was last updated on May of 2024.