7306.30.50.26 - With an outside diameter not exceeding 50.8 mm

This HTS category, 7306.30.50.26, specifically covers welded tubes, pipes, and hollow profiles of iron or non-alloy steel that are of circular cross-section, have a wall thickness of 1.65 mm or more, and are galvanized. Crucially, these articles are imported with a coupling attached. The "Other" designation at this level indicates they do not fall into more specific subtypes within the broader galvanized category.

This classification is distinguished from its sibling, 7306.30.50.27, solely by the outside diameter. While sibling 7306.30.50.27 applies to articles with an outside diameter exceeding 50.8 mm but not exceeding 114.3 mm, this category, 7306.30.50.26, is for those where the outside diameter does not exceed 50.8 mm. This precise measurement is a key differentiator for customs purposes.

As this is a leaf node, there are no further subcategories. Therefore, the focus for classification here is on confirming all the preceding criteria: welded construction, circular cross-section, iron or non-alloy steel composition, a wall thickness of at least 1.65 mm, galvanized finish, the presence of a coupling, and the specific outside diameter not exceeding 50.8 mm.