7306.30.10.00 - Having a wall thickness of less than 1.65 mm

This HTS category, 7306.30.10.00, specifically classifies welded tubes, pipes, and hollow profiles of iron or nonalloy steel that have a circular cross-section and a wall thickness measuring less than 1.65 mm. These articles are constructed using welding techniques to form their tubular shape and are distinguished by their relatively thin walls. Examples include lightweight steel tubing used in furniture, ventilation systems, or certain types of conduits where structural rigidity is not the primary requirement.

The defining characteristic that separates this category from its sibling is the wall thickness. While both fall under "Other, welded, of circular cross section, of iron or nonalloy steel," this specific subheading targets those with walls *less than* 1.65 mm. Its sibling category, conversely, covers similar items but with a wall thickness of 1.65 mm *or more*, indicating a difference in intended application and potential structural integrity.

As a leaf node, this category has no further subdivisions. Therefore, classification within this specific code relies solely on meeting the criteria of being a welded, circular cross-section tube or pipe of iron or nonalloy steel with a wall thickness strictly below 1.65 mm. When determining the correct classification, precise measurement of the wall thickness is paramount.