7306.19.10.50 - With an outside diameter exceeding 114.3 mm

This HTS category, 7306.19.10.50, specifically classifies "line pipe of a kind used for oil or gas pipelines" that are of iron or nonalloy steel and possess an outside diameter exceeding 114.3 mm. These are tubular products designed for the conveyance of oil and natural gas, characterized by their robust construction and typically large dimensions to withstand high pressures and significant volumes. The material composition focuses on iron or nonalloy steel, indicating that alloys with substantial amounts of other elements are excluded from this particular subclassification.

This category is distinguished from its sibling, 7306.19.10.10, based on a critical physical dimension: the outside diameter. While both fall under the broader classification of "Other line pipe of a kind used for oil or gas pipelines," this specific code applies only to pipes where the outside diameter is greater than 114.3 mm. This cut-off point is a key criterion for accurate classification, ensuring that larger diameter pipes, often used in major transmission lines, are correctly identified.

As this HTS code represents a leaf node, there are no further subcategories. Classification within this code is therefore dependent on fulfilling all the preceding criteria: being a tube, pipe, or hollow profile of iron or steel; being of a kind used for oil or gas pipelines; being of iron or nonalloy steel; and critically, having an outside diameter exceeding 114.3 mm. Examples within this category would include large-diameter, welded or seamless pipes intended for cross-country oil and gas transportation networks.