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SITCSection 7
U.S. imports of insulating fittings for electrical machines — plastic (SITC 77328) totaled $14.1M in April 2026, traded with 48 countries.
Importers of Insulating Fittings for Electrical Machines — Plastic paid $2.0M in duties in April 2026 — an effective duty rate of 16% on $12.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 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.
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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| Country | Imports | Exports | Balance |
|---|---|---|---|
| MEXICO | $1.3M | $11.0M | +$9.7M |
| PHILIPPINES | $11K | $4.6M | +$4.6M |
| CHINA | $3.5M | $300K | -$3.2M |
| GERMANY | $1.2M | $1.4M | +$249K |
| SWITZERLAND | $2.2M | $109K | -$2.1M |
Monthly import values over time