U.S. imports of Self-Propelled Coal or Rock Cutters and Tunneling Machinery (HS 843031) totaled $11.3M in August 2026, imported from 15 countries.
Importers of Self-Propelled Coal or Rock Cutters and Tunneling Machinery paid $754K in duties in August 2026, an average duty rate of 6.66% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Self-Propelled Coal or Rock Cutters and Tunneling Machinery imports of $11.3M in August 2026 ran 68% above the year-to-date monthly average of $6.8M.
Last updated: August 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.
36 import shipments a month
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.
Subheading 5 of 9 in heading 8430
Subheading 843031 · $11.3M of $192.0M
ImportsExports
Imports
$11.3MYoY · free account
Exports
$2.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $83.5M of Self-Propelled Coal or Rock Cutters and Tunneling Machinery and exported $68.7M.
Through August 2026. Source: U.S. Census Bureau.
Trade Directory
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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 |
|---|---|---|---|---|---|
| 8430310080 | Coal Cutters and Tunneling Machinery, Self-Propell | $7.8M | 4.82% | 100.00% | $374K |
| 8430310040 | Rock Breaking Machines, Self-Propelled | $3.6M | 10.67% | 100.00% | $380K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8430310000 | Coal or Rock Cutters & Tunnel Mach, Self-Propelled | $2.2M |
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
Australia and Finland together supply 82% of it.
customs district
destination
entry
rate provision · imports
duty collected equals 6.66% of imports for consumption.