Insulating fittings for electrical machines — HTS 8547
Insulating fittings for electrical machines, appliances or equipment, being fittings wholly of insulating material apart from any minor components of metal (for example, threaded sockets) incorporated during molding solely for the purposes of assembly, other than insulators of heading 8546; electrical conduit tubing and joints therefor, of base metal lined with insulating material
Chapter 85 › Heading 8547
2026 HTS Rev 19 Synced Rules verified Operational
Written to help non-specialists understand this page. Rates, dates, and legal facts come from the official records above and on the linked source.
HTS heading 8547 covers certain electrical insulating fittings and related conduit products. It includes fittings for electrical machines, appliances, or equipment that are made wholly of insulating material, except for minor metal parts—such as threaded sockets—added during molding only to help with assembly. It also covers electrical conduit tubing and conduit joints made of base metal lined with insulating material. Insulators classified under heading 8546 are excluded.
The 4-digit heading is a broad category, not the final classification. To reach the correct 8-digit HTSUS subheading, follow the tariff schedule’s subdivisions, which commonly distinguish the product by its construction, material, or specific type. Review the legal wording and any applicable section or chapter notes, then match the complete product—not merely its marketing name—to the most specific description.
What to check
- Identify whether the item is an insulating fitting, or metal conduit tubing or a conduit joint lined with insulating material.
- Confirm that a fitting is predominantly insulating material and that any metal parts were incorporated only for assembly; separately functional metal parts may affect classification.
- Check the exact material and construction, such as the type of insulating material, base metal, lining, and whether the item is tubing or a joint.
- Compare the product’s physical design and intended use with every 8-digit option and read the related legal notes, exclusions, and unit-of-measure information.
- Keep specifications, drawings, photographs, material data, and supplier descriptions that support the selected code; ask a customs broker or request a binding ruling if the distinctions are unclear.
HTS heading 8547 summary
Insulating fittings for electrical machines is a 4-digit product category containing 2 published product-code lines in this snapshot. A heading does not carry one universal duty rate; classification must be narrowed to the line matching the product facts.
How to find your code in this category
A heading is a product category. To get the exact duty, narrow from this 4-digit heading to a sub-category (usually by material), then open the 8-digit code that matches your product.
Open any code in the tables below to see its exact duty rate, a duty calculator (enter your shipment value → estimated duty and landed cost), the rate-change history chart, and the country-by-country breakdown (including Section 301/232 add-on duties).
Why you have to click in: a single category can contain products with very different duties. The rate depends on the specific product — its material and construction — and on the country of origin, and those only get pinned down at the 8-digit code level. That is why this page points you to codes instead of showing one rate for the whole category.
Sub-categories
| Code | Description |
|---|---|
| 8547.10 | Insulating fittings of ceramics |
Product codes & duty rates
👇 Each row is a specific product code — click a blue code to open its full page with exact duty rates by country, the rate-history chart, and a duty calculator. 👉
| Code | Description | General (MFN) | Special | Column 2 |
|---|---|---|---|---|
| 8547.20.00.00 👉 | Insulating fittings of plastics | Free | — | 30% |
| 8547.90.00 👉 | Other | 4.6% | Free | 45% |
"Special" shows the free-trade-agreement rate; open a code to see exactly which countries qualify.
Common questions
What products fall under HTS heading 8547?
Insulating fittings for electrical machines, appliances or equipment, being fittings wholly of insulating material apart from any minor components of metal (for example, threaded sockets) incorporated during molding solely for the purposes of assembly, other than insulators of heading 8546; electrical conduit tubing and joints therefor, of base metal lined with insulating material. To classify a specific item you must pick the matching sub-category and 8-digit code above; the right choice usually depends on the material and construction of the product.
How do I choose the right code within this category?
Start from the sub-categories (typically divided by material—for example cotton versus man-made fibers), then open the active 8- or 10-digit code that matches the product. When unsure, a licensed customs broker or a CBP binding ruling can confirm the classification.
Reference information only, not customs, legal, or classification advice. Confirm the current code and rate against the official HTS before you import.