7213.91 - Of circular cross section measuring less than 14 mm in diameter:

This HTS category, 7213.91, covers hot-rolled bars and rods of iron or nonalloy steel that are wound in irregular coils and have a circular cross-section with a diameter measuring less than 14 millimeters. These products are characterized by their continuous, coiled form, which is a result of the hot-rolling process, and their relatively small diameter. They are typically used as raw materials in various manufacturing processes, such as wire drawing, forging, or as components in the production of fasteners and other metal articles.

This specific category is distinguished from its sibling, 7213.99.00 ("Other"), by its precise dimensional criteria. While 7213.99.00 encompasses hot-rolled, irregularly coiled bars and rods of iron or nonalloy steel that do not meet the specific diameter and cross-section requirements of other subheadings within 7213, 7213.91 is exclusively for those with a circular cross-section and a diameter under 14 mm.

Within this category, further distinctions are made through its subcategories. The primary subdivision, 7213.91.30, addresses products that have not undergone further processing such as tempering or heat treatment, and are not partly manufactured into finished or semi-finished goods. The existence of an "Other" subcategory indicates that there may be other specific processing statuses or types of further manufacturing for these circular, small-diameter coiled bars and rods that fall outside the scope of 7213.91.30, allowing for more granular classification.