7315.89.10.00 - Not over 8 mm in diameter

This HTS classification, 7315.89.10.00, specifically covers chain and parts thereof made of iron or steel, where the links have an essentially round cross-section and a diameter not exceeding 8 millimeters. This category is intended for chains that are relatively fine in construction, commonly used in applications where strength is needed but the bulk of a larger diameter chain is not required. Examples include certain types of decorative chains, lighter duty hoisting chains, or chains used in specialized machinery where precise fit and limited weight are paramount.

This category is distinguished from its sibling, 7315.89.30.00, solely by the physical dimension of the chain links. While both fall under "other chain" with links of essentially round cross-sections, 7315.89.10.00 is for those with a diameter of 8 mm or less, whereas 7315.89.30.00 is for chains with links exceeding 8 mm in diameter. This distinction is crucial for customs purposes, reflecting a practical difference in the intended use and load-bearing capacity of the chains.

As this is a leaf node within the HTS structure, there are no further subcategories. Therefore, the classification is definitive based on the material (iron or steel), construction type (chain with links of essentially round cross-sections), and the specific dimensional criteria of the link's diameter (not over 8 mm).