HS Code for Transformer Cores and Parts
The HS Code for transformer cores and parts 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 transformers and inductors
HS Code 850490 covers transformer and inductor parts, including cores, with a US MFN duty rate of 3%.
Frequently Asked Questions
What additional costs beyond the duty rate should I anticipate when importing transformer cores and parts under HTS 850490?
Transformer cores and parts often incur U.S. Merchandise Processing Fees (MPF), which is 0.3464% of the entered value (minimum $29.22, maximum $634.62 per entry). Furthermore, if the imported components contain parts made of steel or aluminum, they may be subject to Section 232 national security tariffs, adding a 3% or 3% duty respectively on the value of those constituent materials.
Are import licenses or special regulatory approvals required for importing transformer cores and parts under HTS 850490?
While general import licenses are often not required, transformer parts and cores are frequently subject to specific industry regulations. Importers must confirm compliance with standards from bodies like Underwriters Laboratories (UL) or the Institute of Electrical and Electronics Engineers (IEEE), and these components may also be reviewed for energy efficiency regulations depending on their end-use.
What are the critical shipping and packaging requirements for transformer cores and parts (HTS 850490) to prevent customs delays?
Transformer cores and parts, especially those made of grain-oriented electrical steel, must be packaged to prevent rust and physical damage, with clear marking of 'Fragile' and 'Keep Dry'. Shipments often require a commercial invoice detailing the core material and value, along with packing lists specifying gross/net weights to facilitate accurate HS code verification. For air freight, magnetic shielding may be necessary if the parts have significant residual magnetism to comply with aviation safety regulations.
Seasonal Import Trends for Transformer Parts
Imports of transformer cores and parts (HTS 8504.90) show predictable seasonal peaks. The highest volumes consistently occur in the third quarter (July-September), aligning with utility and industrial projects aiming for completion before year-end. A secondary, smaller increase is often observed in Q1 (January-March) for new fiscal year procurement. This pattern is driven by construction cycles and fiscal year budgets in major importing sectors like power transmission and manufacturing.
Compliance Notes for Transformer Cores and Parts
Transformer cores and parts classified under 8504.90 must comply with energy efficiency standards in many markets, such as the EU's Ecodesign Directive (Lot 2) for power transformers. Importers into North America should verify whether components meet relevant UL standards (e.g., UL 506 for specialty transformers) or CSA standards in Canada. For cores containing ferrous waste and scrap, ensure shipments align with international waste shipment regulations if applicable. Always consult the specific country's electrical safety and electromagnetic compatibility (EMC) regulations prior to import.
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