Standard International Trade Classification
U.S. exports of Synthetic Filament Yarn, N.E.S., Single, Low-Twist (≤50 Turns/Meter, Bulk) (SITC 65163) totaled $14.5M in August 2026.
Importers of Synthetic Filament Yarn, N.E.S., Single, Low-Twist (≤50 Turns/Meter, Bulk) paid $2.3M in duties in August 2026, an average duty rate of 20.49% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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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297 import shipments a month
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.
Basic heading 168 of 766 in section 6
Basic heading 65163 · $14.5M of $13.0B
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Exports · August 2026
destination
El Salvador and South Korea together take 41% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$11.7MYoY · free account
Exports
$14.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $127.2M of Synthetic Filament Yarn, N.E.S., Single, Low-Twist (≤50 Turns/Meter, Bulk) and exported $175.9M.
Through August 2026. Source: U.S. Census Bureau.