7304.29.41.80 - Having an outside diameter exceeding 406.4 mm

This HTS category, 7304.29.41.80, specifically classifies seamless pipes and tubes made of iron or steel, intended for use in drilling for oil or gas. Within the broader classification of casing, tubing, and drill pipe, this subcategory focuses on those manufactured from "other alloy steel." The defining characteristic for items within this specific node is their **outside diameter, which must exceed 406.4 mm**.

This classification distinguishes itself from its sibling categories primarily by the critical dimension of outside diameter. Items classified under other sibling nodes would have outside diameters of less than 215.9 mm, between 215.9 mm and 285.8 mm, or exceeding 285.8 mm but not exceeding 406.4 mm. Therefore, only casing, tubing, or drill pipe made from other alloy steel, used for oil and gas drilling, and possessing an outside diameter greater than 406.4 mm will fall under this specific HTS code.

As this is a leaf node in the HTS classification system, there are no further subcategories. This signifies that the combination of material (other alloy steel), intended use (oil and gas drilling), and the specific outside diameter exceeding 406.4 mm is sufficient to uniquely identify and classify these goods without further breakdown. Importers and exporters should ensure that all these criteria are met to correctly apply this HTS code.