7304.59.80.20 - Having a wall thickness of 6.4 mm or more but not exceeding 12.7 mm

This HTS subcategory, 7304.59.80.20, specifically classifies seamless tubes and pipes of iron or steel, made of "other alloy steel" and having a circular cross-section. The defining characteristic for this classification is the wall thickness, which must be equal to or greater than 6.4 mm but not exceed 12.7 mm. These are considered "other" within the broader categories of alloy steel tubes and pipes with specific diameter ranges.

This particular classification is distinguished from its siblings based solely on its defined wall thickness. Category 7304.59.80.15 covers similar tubes and pipes with a wall thickness *less than* 6.4 mm, while 7304.59.80.25 applies to those with a wall thickness *exceeding* 12.7 mm. Therefore, the critical differentiator for 7304.59.80.20 is the precise 6.4 mm to 12.7 mm wall thickness range.

As this is a leaf node in the HTS structure, there are no further subcategories branching from this specific code. Classification stops at this point, requiring importers and exporters to precisely match the physical characteristics of the merchandise, particularly its wall thickness, to this description. Examples of products that might fall here include high-pressure hydraulic tubing, certain structural components, or specialized piping systems where robust wall thickness is a key performance requirement and falls within this specified range.