7305.12.10.60 - With an external diameter exceeding 609.6 mm

This HTS category, 7305.12.10.60, specifically classifies other longitudinally welded tubes and pipes of iron or nonalloy steel. These are pipes with a circular cross-section, designed for use in oil or gas pipelines, and critically, they possess an external diameter that strictly exceeds 609.6 mm. The material composition is limited to iron or nonalloy steel, and the construction method is longitudinally welded.

This category is distinguished from its sibling, 7305.12.10.30, by its diameter specification. While both are line pipe for oil or gas pipelines, longitudinally welded, and made of iron or nonalloy steel, this category exclusively covers those with an external diameter *exceeding* 609.6 mm. The sibling category covers pipes with an external diameter exceeding 406.4 mm but not exceeding 609.6 mm, creating a clear demarcation based on this precise physical dimension.

As this classification represents a leaf node within the HTS structure, there are no further subcategories to introduce. Classification decisions at this level are finalized by meeting all the criteria of the preceding headings and the specific diameter requirement outlined here. The focus remains on the physical attributes (circular cross-section, external diameter, material) and intended application (oil or gas pipelines) of the longitudinally welded tubes and pipes.