73023000 under HS Code RAILWAY OR TRAMWAY TRACK CONSTRUCTION MATERIAL OF IRON OR STEEL, THE FOLLOWING: RAILS, CHECK-RAILS AND RACK RAILS, SWITCH BLADES, CROSSING FROGS, POINT RODS AND OTHER CROSSING PIECES, SLEEPERS (CROSS-TIES), FISH - PLATES, CHAIRS, CHAIR WEDGES, SOLE PLATES (BASE PLATES), RAIL CLIPS, BEDPLATES, TIES AND OTHER MATERIAL SPECIALIZED FOR JOINTING OR FIXING RAILS- SWITCH BLADES, CROSSING FROGS, POINT RODS AND OTHER CROSSING PIECES, 73024000 under HS Code RAILWAY OR TRAMWAY TRACK CONSTRUCTION MATERIAL OF IRON OR STEEL, THE FOLLOWING: RAILS, CHECK-RAILS AND RACK RAILS, SWITCH BLADES, CROSSING FROGS, POINT RODS AND OTHER CROSSING PIECES, SLEEPERS (CROSS-TIES), FISH - PLATES, CHAIRS, CHAIR WEDGES, SOLE PLATES (BASE PLATES), RAIL CLIPS, BEDPLATES, TIES AND OTHER MATERIAL SPECIALIZED FOR JOINTING OR FIXING RAILS- FISH-PLATES AND SOLE PLATES, and 73182100 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 : SPRING WASHERS AND OTHER LOCK WASHERS were the top imported HS Codes by DA NANG RAILWAY MECHANICAL JOINT STOCK COMPANY in 2021.