Product classification
HS code for Klystron tube: 8540.79
Tubes, microwave (for example klystrons, travelling wave tubes, carlinotrons), excluding magnetrons and grid-controlled tubes.
Classification of klystron tube under HS 8540.79
Klystron tubes are classified under HS code 8540.79. This classification is found within Chapter 85, which encompasses electrical machinery and equipment and parts thereof. Heading 8540 specifically covers thermionic, cold cathode, or photo-cathode valves and tubes, including vacuum tubes. Subheading 8540.79 is a residual category for microwave tubes other than magnetrons and grid-controlled tubes. A klystron is a specialized linear-beam vacuum tube used as an amplifier or oscillator for radio frequencies, particularly in the microwave range. It operates by velocity-modulating an electron beam. Because it is a microwave tube but is distinct from magnetrons (8540.71), it falls into the "other" microwave tube category. These components are vital in high-power applications such as satellite communication ground stations, wideband high-power communication, and particle accelerators. The classification is based on the technical operation of the tube as a thermionic valve designed for microwave frequencies.
- Covers
- Reflex klystrons
- Multi-cavity klystrons
- Klystron amplifiers
- Traveling wave tubes (TWTs)
- Carcinotrons
- Also under 8540.79
- L3Harris TWT (satellite communication)
- CPI Klystron (particle accelerator)
- Thales TWT (radar system)
- Varian Klystron (medical linear accelerator)
- Teledyne TWT (electronic warfare)
Codes often confused with 8540.79
Common mistake. Klystron tubes are often misclassified under 8540.71, which is specifically for magnetrons. While both are microwave tubes, their internal mechanisms differ significantly. They may also be confused with 8541.10 or 8541.21 if the user mistakes the vacuum tube for a solid-state semiconductor device like a diode or transistor.
Top exporters and importers of HS 854079 (the code used for klystron tube), 2025
In 2025, the largest exporter of HS 854079 (the code used for klystron tube) in UN Comtrade data was France, with 28% of world exports; the largest importer in UN Comtrade data was the United States, with 23% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 854079, not only klystron tube.
Top exporters 2025 · share of world exports
- 1 France $98M 28% of world exports
- 2 United States $88M 25% of world exports
- 3 Germany $72M 20% of world exports
World total: $354M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $66M 23% of world imports
- 2 Japan $44M 15% of world imports
- 3 Canada $27M 9.5% of world imports
World total: $286M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for klystron tube
Brazil classifies klystron tube under NCM 8540.79.00: HS 8540.79 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about klystron tube
What is the HS code for Klystron tube?
The HS code for Klystron tube is 854079 (Tubes; microwave (for example klystrons, travelling wave tubes, carlinotrons), excluding magnetrons and grid-controlled tubes). The HS code for a klystron tube is 8540.79, under the category of other microwave tubes.
How do I classify Klystron tube for customs?
Klystron tube is classified under HS code 854079 — Tubes; microwave (for example klystrons, travelling wave tubes, carlinotrons), excluding magnetrons and grid-controlled tubes. This is a 6-digit subheading level code.
Is a klystron tube considered a semiconductor?
No, a klystron is a vacuum tube (thermionic valve) and is classified in 8540, whereas semiconductors are in 8541.
Which countries are the top exporters of klystron tube (HS 854079)?
In 2025, the top exporters of HS 854079 (the code used for klystron tube) in UN Comtrade data were France ($98M, 28% of world exports), the United States ($88M) and Germany ($72M). World exports came to about $354M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of klystron tube (HS 854079)?
In 2025, the top importers of HS 854079 (the code used for klystron tube) in UN Comtrade data were the United States ($66M, 23% of world imports), Japan ($44M) and Canada ($27M). World imports came to about $286M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Klystron tube the same in all countries?
The base HS code 854079 for Klystron tube is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for klystron tube in Brazil?
In Brazil, klystron tube (HS 854079) is classified under NCM 8540.79.00.