7214.99.00.16 - With a diameter less than 76 mm

This HTS category, 7214.99.00.16, encompasses bars and rods of iron or nonalloy steel that have undergone initial processing such as forging, hot-rolling, hot-drawing, or hot-extrusion, and may have been subsequently twisted. Specifically, this subheading covers those articles with a cross-sectional diameter less than 76 millimeters. These are considered "other" bars and rods beyond those specifically defined in earlier subheadings, and within the "other" subcategory, they are further distinguished by their round cross-section and a carbon content of less than 0.25 percent by weight.

The key differentiator for this classification is the physical dimension: a diameter strictly below 76 mm. This distinguishes it from sibling categories 7214.99.00.21, which covers rounds with diameters between 76 mm and 152 mm inclusive, and 7214.99.00.26, for rounds exceeding 152 mm in diameter. Therefore, if an article meets all the preceding criteria for other bars and rods of iron or nonalloy steel, is round, contains less than 0.25 percent carbon, and its diameter is less than 76 mm, it will be classified under this specific subheading.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. The classification is definitive based on the material composition, primary processing, shape, carbon content, and the precise diameter measurement.