7304.29.10.80 - Having an outside diameter exceeding 406.4 mm

This HTS category encompasses seamless casing pipes made of iron or non-alloy steel that are specifically designed for use in the drilling of oil and gas wells. These pipes are threaded or coupled to allow for secure connection and are characterized by having an outside diameter that exceeds 406.4 mm.

This classification is distinct from its sibling categories primarily by its precise dimensional requirement. While other sibling categories cover casing pipes with outside diameters less than 215.9 mm, between 215.9 mm and 285.8 mm, or between 285.8 mm and 406.4 mm, this node specifically targets those with dimensions *greater* than 406.4 mm. This precise diameter range is a critical factor for appropriate customs classification.

As this is a leaf node within the HTS structure, there are no further subcategories under this specific code. Therefore, the focus for classification purposes remains on confirming that the seamless casing pipe is intended for oil and gas drilling, is made of iron or non-alloy steel, is threaded or coupled, and definitively has an outside diameter exceeding 406.4 mm.