7227.90.60.30 - With a diameter of less than 14 mm

This HTS category encompasses hot-rolled bars and rods of other alloy steel, wound into irregular coils, with a circular cross-section and a diameter strictly less than 14 mm. The material is classified as "other alloy steel," meaning it contains alloying elements beyond the basic iron and carbon, but does not fit into more specific alloy steel designations defined elsewhere in the tariff. The hot-rolled manufacturing process and the form of irregular coils are key characteristics for inclusion here.

This specific classification is distinguished from its siblings by the precise diameter of the circular cross-section. Unlike 7227.90.60.35, which covers diameters from 14 mm up to, but not including, 19 mm, and 7227.90.60.40 for diameters of 19 mm and above, this category is exclusively for those rods measuring less than 14 mm in diameter. This granular distinction in physical dimension is critical for accurate customs declaration.

As this HTS code represents a leaf node, there are no further subcategories for this particular item. Therefore, the classification is finalized at this level based on the specified material (other alloy steel), manufacturing process (hot-rolled), form (irregular coils), cross-section (circular), and the precise diameter measurement (less than 14 mm).