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SITCSection 7
U.S. imports of optical fiber cables (SITC 77318) totaled $386.2M in April 2026, traded with 55 countries.
Importers of Optical Fiber Cables paid $33.2M in duties in April 2026 — an effective duty rate of 14% on $229.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Optical Fiber Cables imports of $386.2M in April 2026 ran 15% above the year-to-date monthly average of $336.0M.
Last updated: April 2026 dataOptical fiber cables transmit data as pulses of light through glass or plastic strands, making them the backbone of high-speed telecommunications, data center interconnects, and broadband infrastructure. Classification hinges on whether the cable contains optical fibers individually sheathed, the number of fibers, and the presence of electrical conductors — distinctions that can shift the applicable tariff heading. Imports from major producing countries may be subject to antidumping or countervailing duty orders, so verifying current trade-remedy scope rulings before entry is essential for importers.
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The key classification factors are whether the product transmits signals via light (optical fibers) versus electrical current, the construction of the fiber bundle (individually sheathed vs. loose-tube), and whether any metallic conductors are present for power or reinforcement. Cables with both optical fibers and electrical conductors may be classified differently depending on the principal function, so a binding ruling from CBP is advisable for ambiguous constructions.
Certain optical fiber cable products have been subject to antidumping and countervailing duty investigations targeting specific countries of origin. Importers should check the current scope of any active orders with the International Trade Administration before shipment, as scope rulings can be product-specific and country-specific.
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Monthly import values over time