7306.30.50.43 - With an outside diameter exceeding 50.8 mm but not exceeding 114.3 mm

This HTS category, 7306.30.50.43, specifically classifies welded tubes, pipes, and hollow profiles of iron or non-alloy steel that are of circular cross-section, have a wall thickness of 1.65 mm or more, and are imported with couplings. The defining characteristic distinguishing this subcategory is the presence of imported couplings already attached to the tubular goods.

This classification is distinct from its sibling category, 7306.30.50.41, which covers similar welded circular tubes of iron or non-alloy steel with a wall thickness of 1.65 mm or more, but *without* imported couplings. The inclusion of couplings is the primary factor that places goods into this specific category.

As a leaf node, this classification does not have further subcategories. Therefore, the focus remains on the precise criteria: the material (iron or non-alloy steel), the construction method (welded), the cross-sectional shape (circular), the minimum wall thickness (1.65 mm or more), and crucially, the presence of imported couplings. This category captures a specific subset of tubular goods where the integration of coupling mechanisms is part of the imported product.