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SITCSection 6
U.S. imports of iron & steel towers and lattice masts (SITC 69112) totaled $77.2M in April 2026, traded with 21 countries.
Importers of Iron & Steel Towers and Lattice Masts paid $20.1M in duties in April 2026 — an effective duty rate of 26% on $76.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Iron & Steel Towers and Lattice Masts imports of $77.2M in April 2026 ran 39% above the year-to-date monthly average of $55.5M.
Last updated: April 2026 dataLattice towers and masts of iron or steel are a primary structural form for transmission line towers, telecommunications masts, wind turbine support structures, and broadcast antenna towers. Section 232 tariff exposure applies to steel inputs and may extend to fabricated tower structures depending on classification, making cost modeling for large infrastructure projects sensitive to trade-remedy status. Galvanization grade, bolt-hole patterns, and section geometry are typically engineered to project-specific drawings, which means imports are almost always made-to-order rather than off-the-shelf.
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Tubular (monopole) wind turbine towers are generally classified under a separate provision for towers and tubular masts, while open lattice-frame wind turbine support structures may fall here. The distinction between tubular and lattice construction is the key classification criterion, and the correct heading should be confirmed against the specific structural design drawings.
Importers typically present engineering drawings specifying the lattice or open-frame construction, a commercial invoice identifying the end-use application (e.g., transmission line, telecom), packing lists with section weights, and mill test reports for the steel. For Buy America-funded projects, additional origin documentation for the steel itself may be required by the project owner.
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Monthly import values over time