Single Nylon & Polyamide Filament Yarn, Untwisted or Low-Twist (Non-Elastomeric)

Line 5402451000 is specifically reserved for colored nylon multifilament yarn that is untwisted or with twist less than 5 turns per meter, while 5402459010 and related lines cover uncolored or other constructions. 'Colored' in this context means the yarn has been dyed or solution-dyed prior to importation. Misidentifying a dyed yarn as undyed — or vice versa — places the entry on the wrong 10-digit line and can trigger reclassification upon examination.

Mexico's prominence under this heading is consistent with the integrated North American textile supply chain supported by USMCA, under which qualifying nylon yarn may move duty-free between the US and Mexico when rules of origin are met. US apparel and fabric manufacturers with cut-and-sew operations in Mexico frequently source nylon yarn regionally to maintain tariff preference eligibility, making origin documentation and fiber content certification routine compliance requirements for these trade flows.