7304.29.41.10 - Having a wall thickness less than 12.7 mm

This HTS classification, 7304.29.41.10, specifically covers seamless tubes and pipes made of iron or steel, intended for use in drilling for oil or gas. These articles are characterized by being "casing" and made from "other alloy steel" types, with an "outside diameter less than 215.9 mm." The defining characteristic for this particular code is a wall thickness measuring strictly less than 12.7 mm.

This category is distinguished from its sibling, 7304.29.41.20, based solely on the physical dimension of the wall thickness. While both classifications pertain to casing of other alloy steel with an outside diameter under 215.9 mm, the critical differentiator is whether the wall thickness meets or exceeds 12.7 mm (in which case it would fall under the sibling code) or is less than 12.7 mm, as is the case here.

As a leaf node within the HTS structure, this classification does not have further subdivisions. Therefore, classification under 7304.29.41.10 is definitive for seamless casing pipes used in oil and gas drilling, made of other alloy steel, with an outside diameter less than 215.9 mm, and a wall thickness that is discernibly less than 12.7 mm. This precise definition ensures accurate tariff application for these specialized tubular goods.