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HSChapter 84
U.S. imports of self-propelled coal or rock cutters and tunneling machinery (HS 843031) totaled $8.8M in April 2026, traded with 9 countries.
Importers of Self-Propelled Coal or Rock Cutters and Tunneling Machinery paid $862K in duties in April 2026 — an effective duty rate of 10% on $8.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Self-Propelled Coal or Rock Cutters and Tunneling Machinery imports of $8.8M in April 2026 ran 55% above the year-to-date monthly average of $5.7M.
Last updated: April 2026 dataContinuous miners, roadheaders, tunnel boring machine (TBM) cutterheads, and self-propelled rock-breaking machines used in underground mining and civil tunneling are covered here, with the US schedule distinguishing rock-breaking machines (8430310040) from coal cutters and tunneling machinery proper (8430310080). Germany leads US imports by a wide margin, reflecting the country's dominant position in TBM and roadheader manufacturing; Austria and Finland are also top suppliers, consistent with their specialized underground-mining equipment industries. These are high-value, project-specific capital goods often imported under long-term supply contracts.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Both roadheaders and TBMs can fall within 843031, but the classification turns on the machine's specific cutting mechanism and mobility. A roadheader uses a rotating boom-mounted cutterhead and is self-propelled on tracks; a TBM uses a full-face rotating cutterhead. If a TBM's cutterhead is imported separately from its thrust and support systems, the components may classify differently. For complex multi-component tunnel-drive systems, a CBP binding ruling is advisable before importation.
These are purely industrial machines and do not trigger mandatory admissibility review by FSIS, FDA, or APHIS. However, very large or oversize TBM components may require special permits from the Department of Transportation for overland transport after port clearance, and project-specific export controls in the country of origin (particularly for dual-use technology) should be reviewed before shipment.
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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 |
|---|---|---|---|---|
| 8430310080 | COAL CUTTERS AND TUNNELING MACHINERY, SELF-PROPELL | $6.8M | 10.00% | $681K |
| 8430310040 | ROCK BREAKING MACHINES, SELF-PROPELLED | $2.0M | 10.34% | $182K |
COAL CUTTERS AND TUNNELING MACHINERY, SELF-PROPELL
ROCK BREAKING MACHINES, SELF-PROPELLED
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8430310000 | COAL OR ROCK CUTTERS & TUNNEL MACH, SELF-PROPELLED | $1.5M |
COAL OR ROCK CUTTERS & TUNNEL MACH, SELF-PROPELLED
105 no
DIGITAL PROCESSING UNITS, N.E.S.O.I.
HS 847150
PARTS & ACCESSORIES FOR ADP MACHINES & UNITS
HS 847330
PORT DIGTL AUTOMATIC DATA PROCESS MACH NOT > 10 KG
HS 847130
AUTOMATIC DATA PROCESSING STORAGE UNITS, N.E.S.O.I
HS 847170
AUTOMATIC DATA PROCESSING UNITS, N.E.S.O.I.
HS 847180
TURBOJET AND TURBOPROLLER PARTS
HS 841191
| State | Imports | Exports | Balance |
|---|---|---|---|
| West Virginia | $4.2M | -- | -$4.2M |
| New York | $1.2M | -- | -$1.2M |
| Alaska | $1.2M | -- | -$1.2M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NEWARK, NJ | $5.5M | -- | -$5.5M |
| TACOMA, WA | $1.2M | -- | -$1.2M |
| BALTIMORE, MD | $634K | $324K | -$310K |