7217.10.80.25 - With a diameter of less than 1.0 mm

This HTS category, 7217.10.80.25, specifically classifies wire of iron or non-alloy steel that is not plated or coated, even if polished. The defining characteristic for this subcategory is its diameter, which must be less than 1.0 mm. The steel in this wire must contain 0.6 percent or more carbon by weight, and it must have undergone a heat treatment process. This classification is relevant for both raw materials and manufactured components where these specific physical and metallurgical properties are paramount.

To distinguish this category from its siblings, the critical differentiator remains the wire's diameter. Category 7217.10.80.30 covers similar wire with a diameter of 1.0 mm or more but less than 1.5 mm, while 7217.10.80.45 applies to wire with a diameter of 1.5 mm or more. Therefore, meticulous measurement of the wire's cross-sectional dimension is essential for accurate classification within this group of "Other" round wires.

As this is a leaf node within the HTS structure, there are no further subcategories. Classification decisions at this level rely entirely on the precise adherence to the diameter requirement, the specified carbon content, the lack of plating or coating, and the fact that the wire has been heat-treated. Examples of goods that would fall under this classification include very fine steel wire used in specialized industrial applications, precision instruments, or certain types of springs where thin diameter and high tensile strength after heat treatment are critical.