73053990 under HS Code OTHER TUBES AND PIPES (FOR EXAMPLE, WELDED, RIVETED OR SIMILARLY CLOSED), HAVING CIRCULAR CROSS-SECTIONS, THE EXTERNAL DIAMETER OF WHICH EXCEEDS 406.4 MM, OF IRON OR STEEL - OTHER, WELDED : OTHER : OTHER, 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, and 73079910 under HS Code TUBE OR PIPE FITTINGS (FOR EXAMPLE, COUPLINGS, ELBOWS, SLEEVES), OF IRON OR STEEL - OTHER : OTHER : GALVANISED. were the top exported HS Codes by J SPIRAL STEEL PIPE CO LTD in 2021.