7217.90.50.90 - Containing by weight 0.6 percent or more of carbon

This HTS classification, 7217.90.50.90, specifically covers wire of iron or nonalloy steel that contains by weight 0.6 percent or more of carbon. This category is for wire that does not fall under specific requirements for tensile strength or other characteristics that would place it in other more granular subheadings within 7217. The "Other" designation at this level indicates that it's a residual category for iron and nonalloy steel wire not otherwise specified by carbon content thresholds or specific forms.

The key differentiator for this subheading is its carbon content. It is distinct from its siblings, 7217.90.50.30 (containing less than 0.25 percent carbon) and 7217.90.50.60 (containing 0.25 percent or more but less than 0.6 percent carbon). Goods classified here must have a carbon content of at least 0.6 percent by weight to be accurately assigned.

As this is a leaf node within the HTS structure, there are no further subcategories that subdivide this particular classification. Therefore, classification within 7217.90.50.90 is solely dependent on the material composition (iron or nonalloy steel) and the specified carbon content threshold. Examples of products that might fall into this category include certain types of high-carbon steel wire used in industrial applications where greater hardness and strength are required, but which do not meet the specific criteria for other more specialized wire classifications.