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HSChapter 90
U.S. exports of parts & accessories for automatic regulating & controlling instruments (HS 903290) totaled $41.4M in July 2026.
Importers of Parts & Accessories for Automatic Regulating & Controlling Instruments paid $2.7M in duties in July 2026 — an effective duty rate of 17% on $16.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataReplacement and aftermarket components for the full range of automatic regulating and controlling instruments — thermostats, manostats, hydraulic/pneumatic controllers, and the broad NESOI category — are covered here, with seven 10-digit lines mapped to their respective parent headings. Mexico leads US imports, reflecting the cross-border manufacturing relationships that characterize North American controls production, while China is the second-ranked supplier — a combination that makes Section 301 exposure a recurring compliance consideration for sourcing teams. Parts for thermostat assemblies (9032906120), manostat components (9032906140), and hydraulic/pneumatic instrument parts (9032906160) each have dedicated lines, while 9032906180 captures all remaining automatic-control parts.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2.6K shipments/mo
Parts that are identifiable as suitable solely or principally for thermostats are classified under 9032906120. If a component is genuinely interchangeable across thermostat and non-thermostat automatic controllers without design preference for either, it falls under the NESOI parts line 9032906180. Importers should retain OEM documentation showing the part's primary design application, as CBP may request evidence of principal use when a component is physically identical across product families.
China is a significant supplier of parts under this heading, and many 10-digit lines within 9032.90 have been subject to Section 301 tariffs. The specific rate and any product exclusions depend on the tariff line and the date of entry; exclusions have been granted, modified, and allowed to lapse at various times. Importers sourcing from China should conduct a line-by-line Section 301 review for each part number and monitor USTR exclusion lists, as the landscape changes more frequently than the base HTS schedule.
Subheading 3 of 5 in heading 9032
Subheading 903290 · $29.3M of $363.3M
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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 |
|---|---|---|---|---|---|
| 9032906180 | Pts,Autom Regulating/Controlling Inst & Appt,NESOI | $24.4M | 8.37% | 51.91% | $2.0M |
| 9032906120 | Parts and Accessories of Thermostat, NESOI | $2.5M | 11.39% | 74.51% | $286K |
| 9032904100 | Pts, Automatic Voltage-Current Regulator,NESOI | $1.0M | 5.37% | 32.48% | $56K |
| 9032902100 | Pts,Volt-Current Ruglatrs,Use in 6,12;or 24v,NESOI | $627K | 22.95% | 85.77% | $144K |
| 9032906140 | Parts and Accessories of Manostats, NESOI | $479K | 25.24% | 92.48% | $121K |
| 9032906160 | Parts of Inst & Appt of Subhdg 9032.81, NESOI | $282K | 18.08% | 96.28% | $51K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 9032900000 | Pts, Autom Regulating/Controlling Inst & Apprts | $41.4M |
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
$29.3MYoY · Pro
Exports
$41.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Mexico and Canada together take 55% of it.
customs district
origin
entry
rate provision · imports
44.6% enters free of duty; the effective duty rate is 9.20%.