HS Code for Transformer Parts and Bushings
The HS Code for transformer parts and bushings is 850490. The MFN duty rate for importing to the US is 3%.
| HS Code (6-digit) | 850490 |
|---|---|
| US Duty Rate (MFN) | 3% |
| EU Duty Rate (MFN) | 2.2% |
| Chapter | 85 |
| Heading | 8504 |
| Last Updated | 2026-05 |
Description
Parts of electrical transformers and inductors
HS Code 850490 covers parts for electrical transformers and inductors with a US MFN duty rate of 3%.
Frequently Asked Questions
Are there specific import license requirements for transformer parts and bushings classified under HTS 8504.90?
Yes, transformer parts and bushings often require specific import licenses, such as the Bureau of Industry and Security (BIS) import license, due to their dual-use potential in electrical power transmission systems. Additionally, the import of oil-filled components may trigger EPA TSCA (Toxic Substances Control Act) declarations and require documentation proving the dielectric fluid is not PCB-contaminated. Always verify the exact part's specifications with the relevant regulatory agencies prior to shipment.
What specific packaging and shipping requirements apply to transformer bushings to prevent damage during ocean freight?
Transformer bushings, especially ceramic or composite types, must be crated in rigid, shock-absorbent packaging and clearly marked 'FRAGILE' due to their susceptibility to vibration and impact. For oil-filled bushings, shipping documentation must include an MSDS, and the packaging must be sealed and upright to prevent leakage, complying with IMDG Code special provisions.
Common Classification Mistakes for Transformer Parts and Bushings (8504.90)
A frequent error is classifying finished electrical bushings, which are specific insulators for passing conductors through a barrier, under HTS 8546.20 or 8547.90. However, if the bushing is designed exclusively for use in transformers, it is correctly classifiable here in 8504.90. Another common mistake involves classifying generic insulating fittings of ceramic (e.g., 8546.20) or plastics (e.g., 3926.90) here; 8504.90 is only for parts *solely or principally* used with transformers (heading 8504). Always verify the part's principal use and specific design.
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