7306.50.10.00 - Having a wall thickness of less than 1.65 mm

This HTS category, 7306.50.10.00, specifically classifies welded tubes, pipes, and hollow profiles of iron or steel that have a circular cross-section, are made of other alloy steel, and importantly, possess a wall thickness measuring less than 1.65 mm. These items are distinct from other alloy steel tubes of circular cross-section by this precise wall thickness criterion.

The primary classification criterion differentiating this subcategory from its sibling, 7306.50.10.00, is the wall thickness. While both are welded, circular, and made of other alloy steel, this node applies exclusively to those with a wall thickness *under* 1.65 mm, whereas the sibling category encompasses those with a wall thickness *equal to or greater than* 1.65 mm.

As this is a terminal node in the HTS, there are no further subcategories. Therefore, classification into this category hinges entirely on meeting all preceding criteria: being an article of iron or steel, a tube, pipe, or hollow profile (of other types than seamless), welded, of circular cross-section, made of other alloy steel, and having a wall thickness strictly less than 1.65 mm. Examples would include specific types of thin-walled alloy steel tubing used in various industrial applications where the reduced wall thickness is a key design feature.