7304.29.20.50 - Having a wall thickness less than 12.7 mm

This HTS classification pertains to seamless pipes and tubes made of iron or non-alloy steel, specifically designed for use in drilling for oil or gas. These articles fall under the broader category of casing, tubing, and drill pipe. Within this subcategory, this specific heading applies to "other" types of casing that are not of alloy steel.

The critical defining characteristic for this classification is the wall thickness. This category is distinct from its sibling, HTS code 7304.29.20.60, which covers similar casing with a wall thickness of 12.7 mm or more. Therefore, this classification exclusively covers casing with a wall thickness strictly less than 12.7 mm, while the sibling covers those with a wall thickness equal to or greater than 12.7 mm.

As this is a leaf node within the HTS structure, there are no further subcategories. Classification at this level is determined by the specific physical dimension of wall thickness in conjunction with the established criteria of seamless construction, material composition (iron or non-alloy steel), intended use in oil and gas drilling, and outside diameter range (exceeding 285.8 mm but not exceeding 406.4 mm).