Iran Exports of screws, bolts, nuts, coach screws, screw hocks, rivets, of iron or steel to Singapore was US$829 during 2011, according to the United Nations COMTRADE database on international trade. Iran Exports of screws, bolts, nuts, coach screws, screw hocks, rivets, of iron or steel to Singapore - data, historical chart and statistics - was last updated on May of 2024.