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SITCSection 6
U.S. imports of synthetic filament yarn, n.e.s., single, low-twist (≤50 turns/meter, bulk) (SITC 65163) totaled $11.1M in April 2026, traded with 30 countries.
Importers of Synthetic Filament Yarn, N.E.S., Single, Low-Twist (≤50 Turns/Meter, Bulk) paid $1.6M in duties in April 2026 — an effective duty rate of 17% on $9.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataSingle synthetic filament yarns with a twist of no more than 50 turns per meter occupy a specific structural niche: the low-twist construction preserves filament parallelism and luster, making these yarns preferred inputs for flat woven fabrics, linings, and technical textiles where sheen and dimensional stability matter. SITC 65163 is a residual heading for single-ply yarns not captured by the named-fiber or high-tenacity headings, so accurate classification depends on confirming fiber type, ply count, and measured twist level. Importers should note that twist level is a verifiable physical parameter — customs laboratories can measure it — so declared twist specifications must match the actual product.
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Twist is measured in turns per meter (t/m) using a twist tester, following standardized methods such as ASTM D1423 or ISO 2061. CBP or a designated laboratory can perform this test on a sample from the shipment. Importers should request twist test data from the mill and retain it as part of the entry documentation, since the 50 t/m threshold is the dividing line between SITC 65163 and 65164.
Single-ply and multiple (folded) or cabled yarns fall under different SITC subheadings (65163/65164 for single; 65169 for multiple/cabled), and the distinction affects both duty rates and quota treatment. A yarn that has been plied or cabled — even if it originated as a single yarn — must be classified as multiple or cabled. Physical inspection of the yarn's construction, supported by the mill's production specification sheet, is the standard way to confirm ply count.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| KOREA, SOUTH | $5.6M | $1.5M | -$4.1M |
| MEXICO | $1.2M | $2.9M | +$1.7M |
| EL SALVADOR | -- | $3.3M | +$3.3M |
| CHINA | $1.4M | $405K | -$973K |
| GUATEMALA | -- | $1.4M | +$1.4M |
Monthly import values over time