7304.39.00.76 - Having a wall thickness less than 19 mm

This HTS classification, 7304.39.00.76, specifically covers seamless tubes, pipes, and hollow profiles made from iron or non-alloy steel that have a circular cross-section. The defining characteristic of this category is that these articles possess a wall thickness strictly less than 19 millimeters. This distinguishes them from other seamless circular steel pipes and tubes at the same level of detail.

The key differentiator for this subheading lies in its wall thickness parameter. In contrast to its sibling category, 7304.39.00.80, which encompasses articles with a wall thickness of 19 mm or more, this category is for those with a thinner wall. Both subheadings fall under the broader classification of "Other" seamless tubes and pipes of iron or non-alloy steel with a circular cross-section, where the outside diameter exceeds 406.4 mm.

As this is a leaf node within the HTS, there are no further subcategories that subdivide this specific classification. Therefore, the practical application of this code relies solely on the combination of being seamless, having a circular cross-section, being made of iron or non-alloy steel, having an outside diameter exceeding 406.4 mm, and most importantly, having a wall thickness less than 19 mm. Examples would include large diameter, relatively thin-walled steel pipes used in various industrial applications where less structural thickness is required.