Harmonized System
U.S. exports of Other Synthetic Filament Yarn, Single, Twisted Over 50 Turns/Meter, Not for Retail Sale (NESOI) (HS 540259) totaled $313K in August 2026.
Importers of Other Synthetic Filament Yarn, Single, Twisted Over 50 Turns/Meter, Not for Retail Sale (NESOI) paid $53K in duties in August 2026, an average duty rate of 36.80% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Other Synthetic Filament Yarn, Single, Twisted Over 50 Turns/Meter, Not for Retail Sale (NESOI) imports of $143K in August 2026 ran 70% below the year-to-date monthly average of $473K.
Last updated: August 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.
18 import shipments a month
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.
Subheading 16 of 22 in heading 5402
Subheading 540259 · $313K of $49.0M
Trade Directory
List your company under HS 540259 — Other Synthetic Filament Yarn, Single, Twisted Over 50 Turns/Meter, Not for Retail Sale (NESOI), so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 5402590100 | Syn Fila Yarn Exc Nylon/Poly Twst>50 Turns/M NESOI | $143K | 36.80% | 100.00% | $53K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 5402590100 | Syn Fila Yarn Exc Nylon/Poly Twst>50 Turns/M NESOI | $313K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$143KYoY · free account
Exports
$313KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $5.8M of Other Synthetic Filament Yarn, Single, Twisted Over 50 Turns/Meter, Not for Retail Sale (NESOI) and exported $7.7M.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.
Exports · August 2026
destination
Japan and United Kingdom together take 67% of it.
customs district
origin
entry
rate provision · imports
duty collected equals 36.80% of imports for consumption.