GIR 1 TERMS OF HEADING 7318 INCLUDES SCREWS, BOLTS, NUTS OF IRON OR STEEL. GIR 6 TERMS OF 1 DASH SUBHEADING THREADED ARTICLES. TERMS OF 2 DASH SUBHEADING 731815 OTHER SCREWS AND BOLTS. CN CODE 73181584 HEXAGON BOLTS WITH TENSILE STRENGTH LESS THAN 800 MPA. OTHER THAN HI-LOK OR FOR USE IN CERTAIN TYPES OF AIRCRAFT.