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HSChapter 85
U.S. imports of parts for electrical transformers, static converters & inductors (HS 850490) totaled $398.2M in July 2026, traded with 66 countries.
Importers of Parts for Electrical Transformers, Static Converters & Inductors paid $41.5M in duties in July 2026 — an effective duty rate of 17% on $245.8M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataTransformer and converter parts span a wide material spectrum — from grain-oriented silicon steel laminations and stacked cores (8504909634, 8504909638) to ferrite cores (8504909610, 8504909630) and printed circuit assemblies for ADP power supplies (8504902000) — making correct classification among the 14 active 10-digit lines a recurring challenge. Mexico leads US import supply, followed by Thailand and Canada, reflecting deep North American and Southeast Asian electronics supply chains. Ferrite and lamination components are particularly sensitive to Section 301 tariffs when sourced from China, and misclassification between transformer parts and static converter or inductor parts can trigger reclassification audits. Importers should maintain detailed bills of materials and engineering drawings to substantiate the specific part-type claimed.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
10.3K shipments/mo
The US schedule distinguishes laminations for incorporation into stacked cores (8504909634), stacked cores for incorporation into transformer parts (8504909638), and wound cores for incorporation into transformers (8504909642). Classification depends on the core's construction method and its stage of manufacture. Engineering drawings and supplier declarations confirming whether the core is wound or stacked are essential supporting documents.
Yes. The schedule separates printed circuit assemblies of power supplies for ADP machines (8504902000) from PCAs of other 850440 or 850450 articles (8504906500) and general NESOI PCAs (8504907500). The ADP-specific line requires that the assembly be dedicated to a power supply designed for ADP equipment of heading 8471. Importers should retain end-use documentation and OEM specifications to support the claimed line.
Subheading 3 of 11 in heading 8504
Subheading 850490 · $398.2M of $3.2B
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ImportsExports
Imports
$398.2MYoY · Pro
Exports
$91.0MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8504907500 | Printed Circuit Assemblies Parts; NESOI | $135.7M | 2.48% | 17.22% | $3.4M |
| 8504909650 | Static Converter Parts, NESOI | $79.3M | 14.15% | 84.03% | $11.2M |
| 8504909690 | Inductor Parts, NESOI | $42.1M | 13.87% | 87.07% | $5.8M |
| 8504909646 | Transformer Parts, NESOI | $35.1M | 6.81% | 66.61% | $2.4M |
| 8504904100 | Power Supply Parts for ADP Machines, NESOI | $27.4M | 17.37% | 97.16% | $4.8M |
| 8504909642 | Wound Cores Parts for Incorp Into Transformers | $25.6M | 18.23% | 99.64% | $4.7M |
| 8504909610 | Ferrites for Transformers | $11.5M | 14.75% | 66.04% | $1.7M |
| 8504902000 | Printed Circuit Assemb of Pwr Sups for ADP Machine | $10.7M | 20.33% | 76.22% | $2.2M |
| 8504906500 | Printed Circuit Assembly Parts of 850440 or 850450 | $9.0M | 12.19% | 70.62% | $1.1M |
| 8504909634 | Laminations for Incorp in Stackd Cores, Trans Prts | $7.5M | 21.65% | 100.00% | $1.6M |
| 8504909638 | Stacked Cores for Incorp Into Transformer Parts | $7.4M | 24.96% | 97.67% | $1.9M |
| 8504909630 | Ferrites, NESOI | $7.0M | 11.58% | 98.43% | $814K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · July 2026
origin
Mexico and Thailand together supply 47% of it.
customs district
destination
entry
rate provision · imports
37.8% enters free of duty; the effective duty rate is 10.41%.