7407.21.90.00 - Other

This HTS category, 7407.21.90.00, encompasses bars and rods of copper-zinc base alloys (brass) that do not conform to the specific exclusionary criteria of other subheadings at this level. Essentially, it serves as a residual category for brass bars and rods not otherwise specified. The key defining characteristic is the material composition, which must be primarily copper with zinc as the principal alloying element, forming brass.

This classification is distinguished from its sibling, 7407.21.70.00, which specifically covers bars and rods of brass having a rectangular cross-section. Therefore, 7407.21.90.00 would include brass bars and rods with non-rectangular cross-sections, such as round, hexagonal, or octagonal profiles. The distinction hinges solely on the shape of the cross-section.

As this is a terminal node within the HTS structure, there are no further subcategories to introduce. Classification into this specific code relies on identifying the material as brass (copper-zinc base alloy) and confirming that the product is in the form of a bar or rod, while simultaneously ensuring it does not meet the description of any preceding, more specific HTS code.