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HSChapter 54
U.S. imports of other synthetic filament yarn, single, twisted over 50 turns/meter, not for retail sale (nesoi) (HS 540259) totaled $368K in April 2026, traded with 10 countries.
Importers of Other Synthetic Filament Yarn, Single, Twisted Over 50 Turns/Meter, Not for Retail Sale (NESOI) paid $43K in duties in April 2026 — an effective duty rate of 12% on $368K in dutiable value, based on actual customs collections rather than the published tariff schedule. Other Synthetic Filament Yarn, Single, Twisted Over 50 Turns/Meter, Not for Retail Sale (NESOI) imports of $368K in April 2026 ran 20% below the year-to-date monthly average of $460K.
Last updated: April 2026 dataResidual high-twist synthetic filament yarns — excluding nylon, polyester, and polypropylene — fall here, capturing specialty polymer yarns such as those based on aramid precursors, polyvinyl alcohol, or other engineered synthetics twisted above 50 turns per meter. The heading resolves to a single 10-digit line (5402590100), making polymer-type documentation the key classification support document. South Korea and China are the leading US suppliers, with Japan and India also present — a supplier profile consistent with advanced synthetic fiber manufacturing capacity in East Asia. Importers sourcing from China should account for Section 301 tariff exposure in their cost modeling.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
While the heading is defined by exclusion (not nylon, polyester, or polypropylene), products encountered in practice include polyvinyl alcohol (PVA) yarn, polylactic acid (PLA) filament, and certain specialty copolymer yarns used in technical textiles or filtration. Aramid-based yarns may also appear here depending on their specific construction, though some aramid products have dedicated classification pathways. Confirming the polymer chemistry with the manufacturer is essential before filing entry.
Misidentifying the polymer type could place the yarn in a heading with a different duty rate or under the scope of an antidumping order that does not actually apply — or, conversely, cause an importer to miss an applicable order. CBP may request fiber identification testing (e.g., AATCC or ASTM methods) to confirm polymer composition. Maintaining manufacturer certificates of analysis that specify the polymer type by chemical name is the most reliable way to defend the classification.
Monthly import values over time
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| CHINA | $740 | $297K | +$296K |
| KOREA, SOUTH | $294K | -- | -$294K |
| UNITED KINGDOM | -- | $242K | +$242K |
| ITALY | -- | $136K | +$136K |
| MEXICO | -- | $68K | +$68K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 5402590100 | SYN FILA YARN EXC NYLON/POLY TWST>50 TURNS/M NESOI | $368K | 11.65% | $43K |
SYN FILA YARN EXC NYLON/POLY TWST>50 TURNS/M NESOI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 5402590100 | SYN FILA YARN EXC NYLON/POLY TWST>50 TURNS/M NESOI | $770K |
SYN FILA YARN EXC NYLON/POLY TWST>50 TURNS/M NESOI
32.7K kg
SYNTHETIC FILAMENT YARN FABRIC FROM THE STRIP
HS 540720
SYN FIL YARN EX SEWING NO RETAIL, POLYESTER
HS 540220
SYNTHETIC STRIP WIDTH NOT > 5MM
HS 540490
SYN FIL YN EXSEW NO RT TX POLYESTER
HS 540233
SYNT FILMT YRN, HIGH TENACITY YARN OF ARAMIDS
HS 540211
SYNT YARN,HIGH TENACTY, NYLON/ OTHR POLYAMIDES,NES
HS 540219
| State | Imports | Exports | Balance |
|---|---|---|---|
| North Carolina | -- | $378K | +$378K |
| Iowa | $294K | -- | -$294K |
| Florida | -- | $247K | +$247K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| CHICAGO, IL | -- | $293K | +$293K |
| LONG BEACH, CA | $288K | -- | -$288K |
| NEW ORLEANS, LA | $8K | $242K | +$233K |