7304.29.20 - Other

This HTS category, 7304.29.20, encompasses "Other" seamless tubes, pipes, and hollow profiles of iron or steel, specifically those used as casing in drilling for oil or gas, and which are *not* threaded or coupled. These are distinct from the sibling category 7304.29.10, which specifically covers threaded or coupled casing of the same type. The classification here relies on the absence of specific threading or coupling features, indicating these are likely handled or prepared for such connections downstream.

The subdivisions within this category are based on precise external diameter measurements. This detailed breakdown is crucial for accurate tariff application, as different diameter ranges may be subject to varying trade policies or have distinct industrial applications and market values. The subcategories differentiate between casing with outside diameters less than 215.9 mm, those between 215.9 mm and 285.8 mm, and those exceeding 285.8 mm but not exceeding 406.4 mm.

The final subcategory, 7304.29.20.80, addresses casing with an outside diameter exceeding 406.4 mm. This granular distinction in outside diameter is the primary classification determinant at this level, reflecting the significant variations in the scale of oil and gas drilling operations and the corresponding specifications required for specialized casing.