7304.39.00.02 - Having an outside diameter less than 38.1 mm 🖩

This HTS classification covers seamless tubes and pipes of iron or nonalloy steel with a circular cross-section. Specifically, these goods are designed for critical industrial applications, including their use in boilers, superheaters, heat exchangers, condensers, refining furnaces, and feedwater heaters. The key defining characteristic of this subcategory is its outside diameter.

This particular code, 7304.39.00.02, is distinguished by its requirement that the outside diameter of the seamless tube or pipe must be less than 38.1 mm. This differentiates it from its sibling categories, which cover tubes and pipes with progressively larger outside diameters (38.1 mm or more but less than 190.5 mm; 190.5 mm or more but not exceeding 285.8 mm; and exceeding 285.8 mm). The functional purpose and material composition (iron or nonalloy steel) are consistent with the broader parent categories.

As this is a leaf node within the HTS structure, there are no further subcategories. Classification under this code is definitively determined by the outside diameter being strictly below 38.1 mm, in conjunction with the established criteria of seamless construction, circular cross-section, and suitability for the specified industrial heating and cooling applications.