84834090 under HS Code Others, 73269099 under HS Code OTHER ARTICLES OF IRON OR STEEL - OTHER : OTHER : OTHER, and 73182200 under HS Code SCREWS, BOLTS, NUTS, COACH-SCREWS, SCREW HOOKS, RIVETS, COTTERS, COTTER-PINS, WASHERS (INCLUDING SPRING WASHERS) AND SIMILAR ARTICLES, OF IRON OR STEEL - NON-THREADED ARTICLES : OTHER WASHERS. were the top exported HS Codes by NAM DAI DUONG MECHANICAL CONSTRUCTION TRADING COMPANY LIMITED in 2021.