7304.59.80.10 - Having an outside diameter less than 38.1 mm

This HTS classification covers seamless tubes, pipes, and hollow profiles made from iron or steel that are of circular cross-section and composed of other alloy steel. Specifically, this category pertains to such articles with an outside diameter strictly less than 38.1 millimeters. These are typically smaller diameter hollow steel sections used in a variety of applications where precise dimensions and material properties are critical.

This classification is distinguished from its sibling categories by its narrow diameter range. While other categories at this level address tubes and pipes with outside diameters of 38.1 mm or more, and progressively larger diameter ranges, this category exclusively includes those with an outside diameter *below* 38.1 mm. The distinction is purely based on the external measurement of the hollow profile, ensuring accurate segregation of goods based on their physical size.

As this node represents a leaf node in the HTS database, there are no further subcategories. Therefore, the classification concludes with the specified diameter criteria. When classifying goods, it is essential to confirm the material composition as "other alloy steel" and verify the seamless construction, in addition to accurately measuring the outside diameter to ensure it falls within the < 38.1 mm range for correct classification under this heading.