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HSChapter 90
U.S. imports of parts & accessories for measuring, checking instruments & profile projectors (HS 903190) totaled $115.4M in April 2026, traded with 65 countries.
Importers of Parts & Accessories for Measuring, Checking Instruments & Profile Projectors paid $12.7M in duties in April 2026 — an effective duty rate of 13% on $98.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Parts & Accessories for Measuring, Checking Instruments & Profile Projectors imports of $115.4M in April 2026 ran 15% above the year-to-date monthly average of $100.0M.
Last updated: April 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.
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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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 9031909195 | PTS,MEASURE/CHECK INST/APPLN&MACH, NESOI | $62.1M | 14.17% | $7.5M |
| 9031905400 | PTS OF OPTICAL INST&APPLN OF 9031.41 OR 9031.49.70 | $27.7M | 11.10% | $2.5M |
| 9031905900 | PARTS,OTH OPTICAL INST&APPLN, EXC TEST BENCHES,NES | $12.2M | 11.93% | $1.3M |
| 9031907000 | PARTS & ACCES OF ARTICLES OF SUBHEADING 9031.80.40 | $5.9M | 9.72% | $571K |
| 9031909160 | PARTS AND ACCESSORIES OF TEST BENCHES, NESOI | $4.9M | 12.51% | $466K |
| 9031909130 | PTS OF MACHINES FOR BALANCING MECHNICAL PTS,NESOI | $1.5M | 16.13% | $198K |
| 9031904500 | BASES & FRAMES FOR COORD-MEASURG MACH OF 9031.4040 | $894K | 16.40% | $81K |
| 9031902100 | PARTS AND ACCESSORIES OF PROFILE PROJECTORS | $259K | 13.08% | $30K |
PTS,MEASURE/CHECK INST/APPLN&MACH, NESOI
PTS OF OPTICAL INST&APPLN OF 9031.41 OR 9031.49.70
PARTS,OTH OPTICAL INST&APPLN, EXC TEST BENCHES,NES
PARTS & ACCES OF ARTICLES OF SUBHEADING 9031.80.40
PARTS AND ACCESSORIES OF TEST BENCHES, NESOI
PTS OF MACHINES FOR BALANCING MECHNICAL PTS,NESOI
BASES & FRAMES FOR COORD-MEASURG MACH OF 9031.4040
PARTS AND ACCESSORIES OF PROFILE PROJECTORS
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 9031900000 | PTS, OF MACH NESOI IN THIS CHAP & PROFILE PROJECTR | $143.7M |
PTS, OF MACH NESOI IN THIS CHAP & PROFILE PROJECTR
537.1K kg
INSTR & APPL F MEDICAL SURGICAL DENTAL VET, NESOI
HS 901890
MED NEEDLES. NESOI, CATHERERS ETC AND PARTS ETC
HS 901839
ARTIFICIAL JOINTS & PARTS & ACCESSORIES THEROF,NES
HS 902139
ELECTRO-DIAGNOSTIC APPARATUS NESOI, AND PARTS ETC.
HS 901819
OZONE,OXYGEN,ETC THERAPY, RESPIRATION APPARATUS,PT
HS 901920
MEAS CHECKNG INSTRUMENT & MACH, NOT OPTICAL, NESOI
HS 903180
| State | Imports | Exports | Balance |
|---|---|---|---|
| California | $22.7M | $46.8M | +$24.1M |
| Texas | $13.9M | $20.7M | +$6.8M |
| Oregon | $9.7M | $15.9M | +$6.2M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| SAN FRANCISCO INTERNATIONAL AIRPORT, CA | $11.9M | $37.7M | +$25.8M |
| CHICAGO, IL | $17.7M | $6.5M | -$11.2M |
| NEW ORLEANS, LA | $10.4M | $13.0M | +$2.5M |