5402.39.31 - Single yarn

This HTS category, 5402.39.31, specifically classifies "single yarn" that is made from synthetic filaments. This yarn is not intended for retail sale in that form and is not a monofilament with a decitex of less than 67. It falls under the broader heading of textured synthetic filament yarn, excluding sewing thread. The key characteristic here is that the yarn is comprised of a single strand, meaning it has not been twisted or combined with other single yarns to form a multiple or cabled structure.

It is important to distinguish this classification from its sibling category, 5402.39.61, which covers "multiple (folded) or cabled yarn." While both are synthetic filament yarns and not put up for retail sale, this node focuses exclusively on single-ply constructions. The sibling category, on the other hand, encompasses yarns where two or more single yarns have been twisted together (folded) or further combined in a cabling process. Therefore, the number of plies or strands is the critical differentiator between these two sibling categories.

The subcategories under 5402.39.31, namely 5402.39.31.10 (Of polyethylene) and 5402.39.31.90 (Other), further refine the classification based on the specific synthetic material of the single yarn. This allows for a more precise categorization based on the polymer composition, which is often a key factor in trade regulations and tariff rates.