7304.29.50.30 - Having a wall thickness exceeding 9.5 mm

This HTS category, 7304.29.50.30, specifically classifies seamless tubes and pipes made of iron or nonalloy steel that are intended for use in drilling for oil or gas. Crucially, these items must possess a wall thickness greater than 9.5 mm to fall under this designation. The "casing, tubing, and drill pipe" descriptor indicates their specialized function in exploration and extraction activities within the energy sector.

This category is distinguished from its sibling, 7304.29.50.15, by the critical criterion of wall thickness. While both fall under the umbrella of tubing for oil and gas drilling and have an outside diameter not exceeding 114.3 mm, this specific subcategory *requires* a wall thickness exceeding 9.5 mm. This physical characteristic is a key differentiator, suggesting these thicker-walled pipes are designed for more demanding applications or to withstand higher pressures and stresses encountered during drilling operations.

As this is a leaf node in the HTS structure, there are no further subcategories under 7304.29.50.30. Therefore, classification at this level relies solely on the precise combination of material (iron or nonalloy steel), form (seamless tubes/pipes), intended use (oil/gas drilling), outside diameter (not exceeding 114.3 mm), and the defining wall thickness (exceeding 9.5 mm). Importers and exporters must ensure all these characteristics are met for accurate classification.