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HSChapter 85
U.S. exports of microwave tubes, not elsewhere specified or included (HS 854079) totaled $13.8M in July 2026.
Importers of Microwave Tubes, Not Elsewhere Specified or Included paid $126K in duties in July 2026 — an effective duty rate of 11% on $1.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Microwave Tubes, Not Elsewhere Specified or Included imports of $7.0M in July 2026 ran 11% above the year-to-date monthly average of $6.3M.
Last updated: July 2026 dataKlystrons and other non-magnetron microwave tubes serve high-power, high-frequency applications in particle accelerators, satellite uplink amplifiers, broadcast transmitters, and electronic warfare systems—markets where solid-state alternatives have not fully displaced vacuum-tube technology. The US schedule separates klystrons (8540791000) from all other NESOI microwave tubes (8540792000), with klystrons distinguished by their bunched-electron-beam amplification mechanism. Germany and Japan lead US import supply, followed by France, the United Kingdom, and Canada, reflecting the concentration of advanced microwave-tube manufacturing in a small number of technically sophisticated countries.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
13 shipments/mo
Klystrons (8540791000) are velocity-modulation amplifier tubes that use bunched electron beams to amplify microwave signals, commonly found in radar transmitters, particle accelerators, and satellite ground stations. Traveling-wave tubes (TWTs), crossed-field amplifiers, and other microwave amplifier types that do not meet the klystron description fall under 8540792000. The operating principle and internal construction documented in the manufacturer's technical specification determine the correct line.
Certain klystrons and traveling-wave tubes are controlled under the Export Administration Regulations or ITAR based on frequency range, gain, and power specifications, particularly those with radar or electronic warfare applications. Importers should verify the device's classification on the Commerce Control List and consult a licensed customs broker or export-control counsel before entry, especially for units intended for re-export.
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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 |
|---|---|---|---|---|---|
| 8540792000 | Microwave Tubes, NESOI | $6.6M | 1.58% | 11.93% | $104K |
| 8540791000 | Klystron Microwave Tubes | $408K | 5.41% | 100.00% | $22K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8540792000 | Microwave Tubes, NESOI | $9.1M |
| 8540791000 | Klystron Microwave Tubes | $4.6M |
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
$7.0MYoY · Pro
Exports
$13.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
Japan and India together take 51% of it.
customs district
origin
entry
rate provision · imports
82.9% enters free of duty; the effective duty rate is 1.81%.