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SITCSection 7
U.S. exports of insulating fittings for electrical machines — plastic (SITC 77328) totaled $27.7M in July 2026.
Importers of Insulating Fittings for Electrical Machines — Plastic paid $2.3M in duties in July 2026 — an effective duty rate of 17% on $13.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataPlastic insulating fittings — molded from engineering thermoplastics such as nylon, polycarbonate, PBT, or thermoset resins — are widely used in motor terminal boxes, connector housings, relay bases, and appliance wiring components where weight reduction and design flexibility are priorities. The resin type and UL or IEC flammability rating (e.g., UL 94 V-0) are primary procurement specifications, as electrical equipment standards often mandate minimum flame-retardancy classes. This heading excludes standalone insulators, covering only fittings that are part of a larger electrical assembly.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.3K shipments/mo
Basic heading 365 of 642 in section 7
Basic heading 77328 · $16.5M of $175.6B
Most electrical equipment standards require plastic insulating fittings to meet UL 94 flammability ratings, with V-0 being the most stringent (self-extinguishing within 10 seconds). IEC 60695 series tests are the international equivalent. Equipment manufacturers often specify the minimum rating in their component approval requirements, and importers should obtain material safety datasheets and UL or equivalent certification records from suppliers.
Nylon (PA66) offers good mechanical strength and moderate heat resistance, making it common in motor terminal blocks. PBT (polybutylene terephthalate) provides better dimensional stability and chemical resistance for connector housings. Polycarbonate is chosen where impact resistance and transparency are needed. Thermoset resins (phenolic, DAP) are used in high-temperature or arc-exposure environments where thermoplastics would deform. Specifying the resin type on purchase orders helps ensure consistent performance across production batches.
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Exports · July 2026
destination
Mexico and Canada together take 67% 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
$16.5MYoY · Pro
Exports
$27.7MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.