SITCSection 8
U.S. imports of parts & accessories for non-optical microscopes & diffraction apparatus (SITC 87139) totaled $9.3M in April 2026, traded with 34 countries.
Importers of Parts & Accessories for Non-Optical Microscopes & Diffraction Apparatus paid $876K in duties in April 2026 — an effective duty rate of 10% on $8.7M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataReplacement electron guns, detector assemblies, sample stages, diffractometer goniometers, and software-integrated control modules for electron and probe microscopes are captured here, supporting the substantial aftermarket for high-value scientific instruments. Given the long service lives and high repair costs of electron microscopes and diffraction systems, the parts trade is commercially significant for university research facilities, national laboratories, and semiconductor fabs. Importers of these components should be prepared to document the specific parent instrument model and OEM part designation to support classification as dedicated parts rather than general electronic components.
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Supporting documentation should include the OEM part number, the manufacturer's specification sheet identifying the compatible instrument models, and a purchase order or invoice referencing the parent microscope system. Customs may also request a technical description confirming the detector is designed and adapted for use exclusively with electron microscopes or diffraction apparatus.
Standalone software transmitted electronically is generally not classified as a physical import. However, software delivered on physical media as part of a parts or upgrade kit may be classified with the physical components. Importers should separate software-only transactions from hardware shipments to avoid classification complications.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| NETHERLANDS | $2.1M | $4.0M | +$1.9M |
| CZECH REPUBLIC | $1.8M | $3.4M | +$1.6M |
| GERMANY | $1.9M | $1.3M | -$597K |
| KOREA, SOUTH | $140K | $2.7M | +$2.5M |
| JAPAN | $1.1M | $1.2M | +$80K |
Monthly import values over time