7306.50.50.50 - With an outside diameter not exceeding 114.3 mm

This classification covers welded tubes, pipes, and hollow profiles made of iron or steel that are of circular cross-section, made from other alloy steel, and have a wall thickness of 1.65 mm or more. Specifically, this category applies to such articles when their outside diameter does not exceed 114.3 mm. These are distinct from their siblings by this precise diameter limitation.

The parent category, "Other," within the context of circular cross-section welded tubes and pipes of other alloy steel with a wall thickness of 1.65 mm or more, is further refined by the outside diameter. This node specifically captures those falling below a certain threshold, ensuring precise classification for goods entering or leaving a country.

Given that this is a leaf node, there are no further subdivisions. Therefore, the critical determining factor for classification within this specific HTS code is the outside diameter being 114.3 mm or less, alongside the previously established criteria of being a welded, circular, alloy steel tube or pipe with a wall thickness of 1.65 mm or greater.