7318210009 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, 7302400000 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 8547200009 under HS Code INSULATING FITTINGS FOR ELECTRICAL MACHINES, APPLIANCES OR EQUIPMENT, BEING FITTINGS WHOLLY OF INSULATING MATERIAL APART FROM ANY MINOR COMPONENTS OF METAL (FOR EXAMPLE, THREADED SOCKETS) INCORPORATED DURING MOULDING SOLELY FOR THE PURPOSES OF ASSEMBLY, OTHER THAN INSULATORS OF HEADING 8546; ELECTRICAL CONDUIT TUBING AND JOINTS THEREFOR, OF BASE METAL LINED WITH INSULATING MATERIAL - INSULATING FITTINGS OF PLASTICS. were the top exported HS Codes by AZIATRANZITREGION LLC in 2021.