HTS heading 9031 · Chapter 90
HTS 9031: Measuring or checking instruments, appliances and…
HTS heading 9031 covers measuring or checking instruments, appliances and machines, not specified or included elsewhere in this chapter; profile projectors; parts and accessories thereof. It has 15 tariff lines with a duty rate; the general (MFN) rates are Free (14 lines), 1.7% (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 |
|---|---|---|---|---|---|
| 9031.10.00.00 | Machines for balancing mechanical parts[No.] | Free | 40% | Estimate → | |
| 9031.20.00.00 | Test benches[No.] | 1.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 45% | Estimate → |
| Other optical instruments and appliances: | |||||
| 9031.41.00 | For inspecting semiconductor wafers or devices (including integrated circuits) or for inspecting photomasks or reticles used in manufacturing semiconductor devices (including integrated circuits) | Free | 50% | ||
| 9031.41.00.20 | For inspecting photomasks or reticles used in manufacturing semiconductor devices[No.] | Estimate → | |||
| For inspecting semiconductor wafers or devices: | |||||
| 9031.41.00.40 | For wafers[No.] | Estimate → | |||
| 9031.41.00.60 | Other[No.] | Estimate → | |||
| 9031.49 | Other: | ||||
| 9031.49.10.00 | Profile projectors[No.] | Free | 45% | Estimate → | |
| 9031.49.40.00 | Coordinate-measuring machines[No.] | Free | 50% | Estimate → | |
| 9031.49.70.00 | For inspecting masks (other than photomasks) used in manufacturing semiconductor devices; for measuring surface particulate contamination on semiconductor devices[No.] | Free | 50% | Estimate → | |
| 9031.49.90.00 | Other[No.] | Free | 50% | Estimate → | |
| 9031.80 | Other instruments, appliances and machines: | ||||
| 9031.80.40.00 | Electron beam microscopes fitted with equipment specifically designed for the handling and transport of semiconductor wafers or reticles[No.] | Free | 40% | Estimate → | |
| 9031.80.80 | Other | Free | 40% | ||
| Equipment for testing the characteristics of internal combustion engines: | |||||
| 9031.80.80.60 | For testing electrical characteristics[kg] | Estimate → | |||
| 9031.80.80.70 | Other[kg] | Estimate → | |||
| 9031.80.80.85 | Other[kg] | Estimate → | |||
| 9031.90 | Parts and accessories: | ||||
| 9031.90.21.00 | Of profile projectors[kg] | Free | 45% | Estimate → | |
| Of other optical instruments and appliances, other than test benches: | |||||
| 9031.90.45.00 | Bases and frames for the coordinate-measuring machines of subheading 9031.49.40[kg] | Free | 50% | Estimate → | |
| 9031.90.54.00 | Of optical instruments and appliances of subheading 9031.41 or 9031.49.70[kg] | Free | 50% | Estimate → | |
| 9031.90.59.00 | Other[kg] | Free | 50% | Estimate → | |
| Other: | |||||
| 9031.90.70.00 | Of articles of subheading 9031.80.40[kg] | Free | 40% | Estimate → | |
| 9031.90.91 | Other | Free | 40% | ||
| 9031.90.91.30 | Of machines for balancing mechanical parts[kg] | Estimate → | |||
| 9031.90.91.60 | Of test benches[kg] | Estimate → | |||
| 9031.90.91.95 | Other[kg] | Estimate → |
24 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 9031.20.00.00 at the general rate of 1.7%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (1.7%) | $170.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $217.14 |
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
- 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.