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HSChapter 90
U.S. exports of parts & accessories for measuring, checking instruments & profile projectors (HS 903190) totaled $150.6M in July 2026.
Importers of Parts & Accessories for Measuring, Checking Instruments & Profile Projectors paid $11.1M in duties in July 2026 — an effective duty rate of 12% on $90.5M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataGermany and Japan lead US supply of replacement and aftermarket components for the broad family of measuring and checking instruments covered by Chapter 90 heading 9031, reflecting those countries' dominance in precision instrument manufacturing. The nine 10-digit lines are tightly mapped to parent articles: 9031905400 covers parts for the semiconductor optical inspection instruments of 9031.41, 9031907000 covers parts for electron beam semiconductor equipment, and 9031902100 covers profile projector accessories, among others. Correct parts classification requires identifying the parent instrument's heading, since duty treatment and statistical reporting can differ across lines. The United Kingdom and Canada round out the top supplier group, with China also a notable source.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
6.0K shipments/mo
Under GRI 1 and the relevant chapter notes, parts that are identifiable as suitable for use solely or principally with a specific instrument are classified with that instrument's parts line. A component equally suitable for both semiconductor optical inspection tools (9031.41) and general optical instruments (9031.49) would typically fall under the NESOI parts line 9031909195. Documenting the OEM part number and its designated parent instrument in entry records helps support the classification if CBP inquires.
Yes — 9031904500 specifically covers bases and frames for coordinate-measuring machines of subheading 9031.40.40, separating these structural components from the broader parts NESOI lines. This distinction matters because structural castings or granite surface plates used as CMM bases are sometimes misclassified under stone or metal headings; their dedicated tariff line in 9031.90 reflects their functional identity as instrument components.
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 9031909195 | Pts,Measure/Check Inst/Appln&mach, NESOI | $64.1M | 10.33% | 80.10% | $6.6M |
| 9031905400 | Pts of Optical Inst&appln of 9031.41 or 9031.49.70 | $24.4M | 7.41% | 67.27% | $1.8M |
| 9031905900 | Parts,Oth Optical Inst&appln, Exc Test Benches,Nes | $15.7M | 9.91% | 83.29% | $1.6M |
| 9031909160 | Parts and Accessories of Test Benches, NESOI | $5.9M | 8.83% | 74.84% | $519K |
| 9031907000 | Parts & Acces of Articles of Subheading 9031.80.40 | $4.4M | 6.79% | 67.67% | $299K |
| 9031909130 | Pts of Machines for Balancing Mechnical Pts,NESOI | $1.4M | 11.68% | 88.26% | $169K |
| 9031902100 | Parts and Accessories of Profile Projectors | $674K | 8.71% | 80.68% | $59K |
| 9031904500 | Bases & Frames for Coord-Measurg Mach of 9031.4040 | $495K | 14.73% | 91.06% | $73K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 9031900000 | Pts, Of Mach NESOI in This Chap & Profile Projectr | $150.6M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$117.1MYoY · Pro
Exports
$150.6MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
17.5% enters free of duty; the effective duty rate is 9.48%.