Harmonized System
U.S. imports of parts & accessories for physical & chemical analysis instruments (HS 902790) totaled $200.6M in August 2026, imported from 79 countries.
Importers of Parts & Accessories for Physical & Chemical Analysis Instruments paid $21.5M in duties in August 2026, an effective tariff rate of 10.74% of the $200.6M imported — duty actually collected as a share of that value, not the published tariff schedule.
Last updated: August 2026 dataThe parts and accessories heading for Chapter 9027 analytical instruments is one of the most structurally complex in the HTS, with seventeen 10-digit subheadings that cross-reference specific parent instrument subheadings — including dedicated lines for parts of chromatographs, spectrometers, electrophoresis instruments, and microtomes. Japan and Germany lead US import supply, with Mexico, Singapore, and China also significant. Microtomes (9027902000), used in histology and materials science to prepare thin sections for microscopy, are separately enumerated here rather than with the analytical instruments themselves. Correct classification of a part requires first identifying the parent instrument's subheading, then locating the corresponding parts line — a two-step process that is a frequent source of entry errors.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
12.2K shipments/mo
Microtomes are specifically enumerated in heading 9027.90 by the HTS schedule, placing them alongside parts and accessories for analytical instruments rather than as standalone instruments. This reflects the HS nomenclature structure, where microtomes have historically been grouped with laboratory preparation equipment ancillary to analysis. Importers should use subheading 9027902000 for microtomes and not attempt to classify them under a finished-instrument heading.
A detector cell identifiable as solely or principally used in a liquid chromatograph of heading 9027.20 should classify under the corresponding parts line for chromatograph accessories — specifically 9027905625 (parts and accessories of articles of 9027.20.50) or the applicable non-electrical parts line, depending on the parent instrument's electrical classification. The importer should document the dedicated use with the manufacturer's part number cross-reference to the parent instrument model.
HSChapter 90
Subheading 1 of 7 in heading 9027
Subheading 902790 · $200.6M of $671.3M
Trade Directory
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 9027908950 | Pts & Access of Inst & Appts for Physical/Chem Etc | $180.9M |
| 9027905430 | Pts & Access of Articles of Subhdg 9027.30.40 | $12.9M |
| 9027902000 | Microtomes, NESOI | $4.6M |
| 9027905440 | Pts & Access of Articles of Subhdg 9027.50.1000 | $974K |
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
$200.6MYoY · free account
Exports
$199.3MYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $2.3B of Parts & Accessories for Physical & Chemical Analysis Instruments.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
China pays 34.9% duty; Mexico 0.3%.
customs district
destination
entry
rate provision · imports
19.1% enters free of duty; duty collected equals 10.74% of total import value.