5510.90.20.00 - Single yarn (607)

This HTS category, 5510.90.20.00, encompasses single yarns composed of artificial staple fibers that are not intended for retail sale. The "single yarn" designation signifies that the yarn consists of a single strand, rather than being twisted or cabled with other strands. These yarns may be mixed with other fibers, but the predominant or sole component must be artificial staple fibers. This classification is relevant for bulk quantities of yarn used in manufacturing processes, not for consumer packaging.

It is crucial to distinguish this classification from its sibling category, 5510.90.40.00, which covers multiple (folded) or cabled yarns. While both categories deal with artificial staple fiber yarns not put up for retail sale, the key differentiator lies in the construction of the yarn. Single yarns, as classified here, are unplied, whereas multiple or cabled yarns are formed by twisting together two or more single yarns.

As this is a leaf node within the HTS structure, there are no further subdivisions. Classification under 5510.90.20.00 is final based on the yarn's construction (single), fiber composition (artificial staple fibers primarily or solely), and presentation (not for retail sale). Therefore, careful examination of the yarn's physical properties and manufacturing to determine its single-strand nature is paramount for accurate classification.