7304.29.50.45 - Having an outside diameter exceeding 114.3 mm but less than 215.9 mm

This HTS classification covers seamless tubes and pipes of iron or nonalloy steel, specifically those used in drilling for oil or gas. These are the "other" types of casing, tubing, and drill pipe that do not fall under specific size or material exclusions at higher levels. The defining characteristic for this particular subcategory is its outside diameter, which must exceed 114.3 mm but remain less than 215.9 mm.

This category is distinguished from its siblings based on precise outside diameter ranges. For instance, it differs from the category covering diameters not exceeding 114.3 mm, as well as those covering larger diameters of 215.9 mm or more. The classification hinges solely on these specific dimensional parameters to ensure accurate tariff application.

As this is a leaf node within the HTS structure, there are no further subcategories. This means that any seamless tube or pipe of iron or nonalloy steel used for oil and gas drilling that meets the specified diameter range (greater than 114.3 mm and less than 215.9 mm) will be classified under this code. Classification professionals should carefully measure the outside diameter to ensure correct placement.