U.S. exports of parts for boring or sinking machinery (nesoi) (HS 843143) totaled $143.6M in August 2026.
Importers of Parts for Boring or Sinking Machinery (NESOI) paid $18.0M in duties in August 2026, an effective tariff rate of 23.46% of the $76.6M imported — duty actually collected as a share of that value, not the published tariff schedule.
Last updated: August 2026 dataServing the oil and gas extraction sector, parts for boring and sinking machinery are subdivided into six 10-digit tariff lines that distinguish offshore drilling and production platform components (8431434000) from tool joints (8431438020), drill pipe with tool joints (8431438040), and other oil and gas field machinery parts (8431438060, 8431438090). Mexico and Canada are the leading suppliers, with China a notable third source whose exports may carry Section 301 exposure. Correct classification hinges on whether the parent machine falls under subheading 8430.41 or 8430.49, making the machine-of-use determination a frequent point of customs scrutiny.
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4.1K shipments/mo
Tool joints (8431438020) are the threaded connectors imported separately, while drill pipe with tool joints (8431438040) covers the assembled pipe-and-connector unit. Importers should ensure the invoice and technical documentation clearly describe whether the article is a standalone connector or an integrated drill pipe assembly, as misclassification between these two lines is a common audit finding.
The 8431434000 line is reserved for parts of offshore drilling and production platforms specifically. If the parent equipment is a land-based or mobile boring machine classified under subheading 8430.41 or 8430.49, the part falls under one of the remaining lines. Customs brokers typically require the parent machine's HTS classification and a technical description of the part's function to make this determination correctly.
HSChapter 84
ImportsExports
Imports
$76.6MYoY · free account
Exports
$143.6MYoY · free account
12-mo low · imports
YoY · free accountOver the twelve months to August 2026, the U.S. imported $867.5M of Parts for Boring or Sinking Machinery (NESOI).
Through August 2026. Source: U.S. Census Bureau.
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Subheading 2 of 8 in heading 8431
Subheading 843143 · $143.6M of $538.2M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8431438090 | Pts of Boring,Sinkng Mac of Subhd 8430.41,8430.49 | $37.9M | 21.81% | 85.93% | $8.3M |
| 8431438060 | Prts of Oil/ Gas Field Mach.;boring/Sinking; NESOI | $19.3M | 27.00% | 95.34% | $5.2M |
| 8431438020 | Prts Oil/ Gas Mach.;boring/ Sinking, Tool Joints | $10.7M | 15.00% | 99.93% | $1.6M |
| 8431438040 | Prts Oil/Gas Mach.;boring/Sinking,Drl Pipe W/Tl Jt | $6.4M | 35.15% | 99.71% | $2.3M |
| 8431434000 | Pts of Offshore Drilling and Production Platforms | $2.2M | 28.09% | 78.66% | $623K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8431438010 | Pts of Oil & Gas Field Mach,NESOI,of Subhd 8430.49 | $79.2M |
| 8431438090 | Pts of Boring,Sinkng Mac of Subhd 8430.41,8430.49 | $44.4M |
| 8431434000 | Pts of Offshore Drilling and Production Platforms | $20.0M |
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.
Exports · August 2026
destination
customs district
origin
entry
rate provision · imports
3.7% enters free of duty; duty collected equals 23.46% of total import value.