U.S. imports of Microwave Tubes, Not Elsewhere Specified or Included (HS 854079) totaled $6.4M in August 2026, imported from 6 countries.
Importers of Microwave Tubes, Not Elsewhere Specified or Included paid $106K in duties in August 2026, an average duty rate of 1.66% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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.
6 import shipments a month
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.
ImportsExports
Imports
$6.4MYoY · free account
Exports
$6.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $74.9M of Microwave Tubes, Not Elsewhere Specified or Included and exported $84.4M.
Through August 2026. Source: U.S. Census Bureau.
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Subheading 1 of 11 in heading 8540
Subheading 854079 · $6.4M of $20.6M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8540792000 | Microwave Tubes, NESOI | $6.4M | 1.66% | 13.28% | $106K |
| 8540791000 | Klystron Microwave Tubes | — | -- | -- | -- |
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 | $3.9M |
| 8540791000 | Klystron Microwave Tubes | $2.5M |
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.
Imports · August 2026
origin
Germany and Japan together supply 100% of it. Japan pays 12.5% duty; Germany 0.0%.
customs district
destination
entry
rate provision · imports
86.7% enters free of duty; duty collected equals 1.66% of imports for consumption.