5402.59.01.00 - Other (606)

This HTS classification, 5402.59.01.00, encompasses synthetic filament yarn, excluding sewing thread and monofilaments under 67 decitex, when such yarn is not packaged for retail sale. Specifically, it covers single yarns with a twist exceeding 50 turns per meter, which are not explicitly classified under other specific synthetic materials at this level. The key differentiating factor is the absence of a defined specific synthetic material like nylon, polyester, or polypropylene, placing it in an "other" category for yarns meeting these general filament yarn criteria.

Unlike its sibling categories which are defined by their specific material composition – such as nylon or polyamides (5402.51.00.00), polyesters (5402.52), or polypropylene (5402.53.00.00) – this code serves as a residual classification. Goods falling under 5402.59.01.00 are those synthetic filament yarns with the specified twist that are not made of the commonly listed polymers. Therefore, it is crucial for importers and exporters to identify the precise polymer making up the filament yarn to ensure correct classification, resorting to this category only when the yarn is not of nylon, polyester, or polypropylene.

As this classification represents a leaf node, there are no further subcategories. The classification is definitive for qualifying synthetic filament yarns that do not fit into the more specific material-based headings within the "other yarn, single, with a twist exceeding 50 turns/m" group. Examples could include yarns made from less common synthetic polymers or blends not otherwise specified, provided they meet the filament yarn and twist requirements.