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HSChapter 85
U.S. imports of parts of cathode tubes (nesoi) (HS 854099) totaled $2.0M in April 2026, traded with 13 countries.
Importers of Parts of Cathode Tubes (NESOI) paid $240K in duties in April 2026 — an effective duty rate of 12% on $2.0M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataElectron guns (8540994000) and RF interaction structures for microwave tubes sit alongside general thermionic, cold-cathode, and photocathode tube parts (8540990000 and 8540998000) under this heading — a mix that serves defense electronics, scientific instrumentation, and legacy broadcast equipment. Czech Republic and Japan are the leading US suppliers, reflecting specialized manufacturing capabilities concentrated in Europe and East Asia. Importers should verify whether specific parts fall under Export Control Classification Numbers, as many cathode-tube components intersect with dual-use technology regulations.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The US schedule separates electron guns and RF interaction structures for microwave tubes (8540994000) from general thermionic, cold-cathode, and photocathode tube parts. The residual NESOI lines (8540990000 and 8540998000) capture parts not specifically described elsewhere; classification often turns on whether the part is dedicated to a microwave tube function or to a broader thermionic/cold-cathode application.
Parts under 854099 are not broadly subject to Section 301 List tariffs in the same way as many consumer electronics, but importers should confirm the current status of each 10-digit line, as trade-remedy applicability can change. Dual-use export-control screening is also advisable for electron guns and microwave interaction structures.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| UNITED KINGDOM | $265K | $10.9M | +$10.6M |
| CZECH REPUBLIC | $646K | $4K | -$643K |
| SINGAPORE | $230K | $396K | +$166K |
| CHINA | $168K | $397K | +$229K |
| FRANCE | $72K | $479K | +$408K |
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8540998000 | THERMIONIC, COLD/PHOTO CATHODE TUBE PARTS, NESOI | $1.7M | 11.07% | $189K |
| 8540994000 | ELECTRON GUNS, RF INTRACTION STRUCT FR MICROWAVE | $275K | 18.49% | $51K |
THERMIONIC, COLD/PHOTO CATHODE TUBE PARTS, NESOI
ELECTRON GUNS, RF INTRACTION STRUCT FR MICROWAVE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8540990000 | THERMIONIC,COLD CATHODE,PHTCATHODE TUBE PARTS, NES | $13.4M |
THERMIONIC,COLD CATHODE,PHTCATHODE TUBE PARTS, NES
90.6K no
MACH FOR RECP/CONVR/TRANS/REGN OF VOICE/IMAGE/DATA
HS 851762
SOLID-STATE NON-VOL SEMICONDUCTOR STORAGE DEVICES
HS 852351
SMARTPHONES
HS 851713
PROCESSORS AND CONTROLLERS, ELECTRONIC INTEG CIRCT
HS 854231
CONTROLS ETC W ELECT APPR F ELECT CONT NOV 1000 V
HS 853710
STATIC CONVERTERS; ADP POWER SUPPLIES
HS 850440
| State | Imports | Exports | Balance |
|---|---|---|---|
| Texas | $176K | $11.3M | +$11.1M |
| California | $886K | $1.2M | +$339K |
| New Jersey | $338K | $318K | -$20K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEW ORLEANS, LA | $322K | $11.8M | +$11.5M |
| SAN FRANCISCO INTERNATIONAL AIRPORT, CA | $725K | $927K | +$201K |
| JFK INTERNATIONAL AIRPORT, NY | $373K | $171K | -$202K |