U.S. imports of Insulated Electric Winding Wire (SITC 77311) totaled $80.0M in August 2026, imported from 57 countries.
Importers of Insulated Electric Winding Wire paid $5.8M in duties in August 2026, an average duty rate of 7.21% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataEnameled, varnished, or otherwise insulated winding wire is a foundational input for motors, transformers, generators, and inductors across virtually every electromechanical industry. The insulation type, conductor material (most commonly copper or aluminum), and wire gauge are the primary specification variables that drive both commercial pricing and technical suitability. Copper winding wire in particular is a globally traded commodity sensitive to LME copper price movements, and importers managing transformer or motor manufacturing supply chains track both metal prices and lead times closely.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2.7K import shipments a month
Winding wire is specifically designed for use in coils—motors, transformers, and similar electromagnetic devices—and is characterized by a thin, uniform insulating coating (enamel, varnish, or similar) applied to enable tight winding. General-purpose insulated conductors intended for power transmission or wiring installations are classified in separate conductor headings, not here.
At the SITC level, both copper and aluminum winding wires fall within this heading. However, at the HTS 10-digit level used for US entry, the conductor material is a key subdivision criterion. Importers should confirm the specific HTS subheading with their broker, as duty rates and any applicable trade-remedy orders may differ by material.
Basic heading 180 of 642 in section 7
Basic heading 77311 · $80.0M of $172.0B
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Imports · August 2026
origin
Mexico and China together supply 64% of it. China pays 41.0% duty; Canada 0.1%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$80.0MYoY · free account
Exports
$52.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $905.8M of Insulated Electric Winding Wire.
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.