7304.39.00.68 - Having a wall thickness of 12.7 mm or more but less than 19 mm

This HTS category, 7304.39.00.68, specifically classifies seamless tubes and pipes of iron or nonalloy steel that have a circular cross-section and an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm. Crucially, this classification is determined by the wall thickness of these pipes, which must be 12.7 mm or greater, but strictly less than 19 mm. These characteristics define the precise dimensional parameters of the steel tubing falling under this code.

This particular category is distinguished from its sibling nodes primarily by its specified wall thickness. Category 7304.39.00.62 covers similar pipes but with a wall thickness less than 12.7 mm, while category 7304.39.00.72 encompasses those with a wall thickness of 19 mm or more. Therefore, the sole differentiating factor at this level of detail, aside from the established diameter range, is the precise measurement of the pipe wall.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. Classification into 7304.39.00.68 is final once the criteria of seamless construction, circular cross-section, iron or nonalloy steel material, an outside diameter between 285.8 mm and 406.4 mm, and a wall thickness between 12.7 mm and less than 19 mm are met. These parameters are critical for accurate customs declarations and duty assessment.