7304.59.80.80 - Having an outside diameter exceeding 406.4 mm

This HTS category, 7304.59.80.80, specifically classifies seamless tubes, pipes, and hollow profiles made of iron or steel, falling under the subcategory of "other alloy steel" with a circular cross-section. The defining characteristic for this particular classification is that these articles possess an outside diameter exceeding 406.4 mm. This encompasses large-diameter pipe and tubing used in significant infrastructure projects, industrial applications, and specialized machinery where substantial fluid or gas transport, or structural support, is required.

This category is distinguished from its sibling categories by a strict diameter threshold. Unlike siblings that cover smaller or mid-range diameters, 7304.59.80.80 is reserved for those articles with the largest outside diameters within the "other alloy steel, circular cross-section, other" group. This precise measurement is crucial for customs declarations and tariff application, ensuring that the appropriate duty rate is applied based on the physical dimensions of the imported or exported goods.

As this node represents a leaf in the HTS structure, there are no further subcategories. Therefore, classification within 7304.59.80.80 is solely determined by confirming that the seamless iron or steel tube, pipe, or hollow profile has an outside diameter greater than 406.4 mm. If the article meets this criterion and otherwise conforms to the material (other alloy steel), form (circular cross-section), and construction (seamless) requirements of the parent categories, it will be classified under this specific HTS code.