HTS heading 8547 · Chapter 85
HTS 8547: Insulating fittings for electrical machines,…
HTS heading 8547 covers 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. It has 5 tariff lines with a duty rate; the general (MFN) rates are 3% (2 lines), Free (2 lines), 4.6% (1 line).
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| 8547.10 | Insulating fittings of ceramics: | ||||
| 8547.10.40.00 | Ceramic insulators to be used in the production of spark plugs for natural gas-fueled, stationary, internal combustion engines[No.] | 3% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 60% | Estimate → |
| 8547.10.80.00 | Other[No.] | 3% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 60% | Estimate → |
| 8547.20.00.00 | Insulating fittings of plastics[No.] | Free | 30% | Estimate → | |
| 8547.90.00 | Other | 4.6% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | |
| 8547.90.00.10 | Other insulating fittings[No.] | Estimate → | |||
| Electrical conduit tubing and joints therefor, of base metal lined with insulating material: | |||||
| 8547.90.00.20 | Conduit tubing[kg] | Estimate → | |||
| Joints: | |||||
| 8547.90.00.30 | Threaded[kg] | Estimate → | |||
| 8547.90.00.40 | Other[kg] | Estimate → | |||
| 8548.00.00.00 | Electrical parts of machinery or apparatus, not specified or included elsewhere in this chapter[No.] | Free | 35% | Estimate → |
9 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 8547.10.40.00 at the general rate of 3%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (3%) | $300.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $347.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Special program codes in this heading
- A, A*, A+
- Generalized System of Preferences (GSP)
- AU
- U.S.–Australia FTA
- B
- Automotive Products Trade Act
- BH
- U.S.–Bahrain FTA
- CL
- U.S.–Chile FTA
- CO
- U.S.–Colombia Trade Promotion Agreement
- D
- African Growth and Opportunity Act (AGOA)
- E, E*
- Caribbean Basin Economic Recovery Act
- IL
- U.S.–Israel FTA
- JO
- U.S.–Jordan FTA
- KR
- U.S.–Korea FTA (KORUS)
- MA
- U.S.–Morocco FTA
- OM
- U.S.–Oman FTA
- P, P+
- CAFTA-DR
- PA
- U.S.–Panama Trade Promotion Agreement
- PE
- U.S.–Peru Trade Promotion Agreement
- S, S+
- USMCA (United States–Mexico–Canada Agreement)
- SG
- U.S.–Singapore FTA
A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.