7304.29.20.80 - Having an outside diameter exceeding 406.4 mm

This HTS classification, 7304.29.20.80, specifically covers seamless pipes and tubes made from iron or nonalloy steel that are used in the oil and gas drilling industry as casing. The defining characteristic of this category is that the casing must have an outside diameter that exceeds 406.4 millimeters. This ensures that the pipes are of a substantial size, suitable for the demanding structural requirements of oil and gas well construction.

This category is distinguished from its sibling categories by its specific diameter range. While other sibling categories cover casing with smaller outside diameters (less than 215.9 mm, between 215.9 mm and 285.8 mm, or between 285.8 mm and 406.4 mm), this code is exclusively for the largest diameter casing intended for drilling applications. This precise differentiation is crucial for accurate tariff application, as different sizes of casing can have varying applications and associated duties.

As this is a leaf node within the HTS structure, there are no further subcategories for this specific classification. Therefore, the classification is finalized at this level based on the material (iron or nonalloy steel), application (oil and gas drilling casing), and the specified outside diameter exceeding 406.4 mm. Importers and exporters should ensure that all these criteria are met to correctly classify goods under this HTS code.