U.S. exports of Parts for Steam and Other Vapor Turbines (HS 840690) totaled $21.3M in August 2026.
Importers of Parts for Steam and Other Vapor Turbines paid $1.8M in duties in August 2026, an average duty rate of 11.74% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Parts for Steam and Other Vapor Turbines imports of $16.1M in August 2026 ran 20% below the year-to-date monthly average of $20.1M.
Last updated: August 2026 dataGermany and Japan dominate US imports of steam and vapor turbine parts, reflecting the global OEM footprint of major turbine manufacturers headquartered in those countries. The US tariff schedule is unusually granular here, with separate lines for finished rotors ready for final assembly (8406902000), rotors not further advanced than permitted for finish machining (8406903000), rotating and stationary blades (8406904000), rotor and spindle assemblies (8406904540), and residual steam turbine parts (8406904580), plus parallel lines for vapor turbine components. Blade and rotor classification is a frequent audit focus because these high-value forgings can be misclassified as general industrial castings if not properly documented.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
320 import shipments a month
A rotor classified under 8406902000 has completed all machining operations and is ready to be installed into a turbine with no further material removal. A rotor under 8406903000 is a rough or semi-finished forging or casting that still requires precision machining before assembly. The distinction matters because the two lines may carry different duty rates, and CBP may request machining records or OEM acceptance test certificates to confirm the stage of manufacture.
Each article in a mixed shipment must be classified separately. Turbine blades specifically designed for steam turbines are classified under 8406904000 (rotating or stationary blades), while general fasteners — even if used in the same overhaul — are classified under their own headings (e.g., heading 7318 for steel bolts). Bundling dissimilar articles under a single turbine-parts line is a common compliance error that can trigger CBP penalty proceedings.
Subheading 1 of 4 in heading 8406
Subheading 840690 · $21.3M of $22.8M
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 |
|---|---|---|---|---|---|
| 8406904580 | Parts of Steam Turbines, NESOI | $6.1M | 10.89% | 97.29% | $664K |
| 8406902000 | Rotors, Finished for Final Assembly, Prt of Stea Tur | $3.9M | 0.19% | 1.50% | $8K |
| 8406904000 | Blades, Rotating or Stationary, Prts of Steam Turbi | $3.3M | 30.00% | 100.00% | $1.0M |
| 8406907500 | Parts of Vapor Turbines, NESOI | $1.3M | 9.34% | 85.95% | $117K |
| 8406904540 | Rotors, Spindles, or Their Assemblies for Steam Turb | $335K | 0.60% | 4.88% | $2K |
| 8406905000 | Rotors, Finshd for Final Assemly, Prts of Vapor Turb | $224K | 0.52% | 5.24% | $1K |
| 8406906000 | Rotors, Not Further Advanced, Prts of Vapor Turbine | $107K | 0.00% | 100.00% | -- |
| 8406907000 | Blades, Rotating or Stationary, Prts of Vapor Turbin | — | -- | -- | -- |
| 8406903000 | Rotors, Not Further Advanced or to Permit Finis Mac | — | -- | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8406900040 | Parts for Steam Turbines | $13.7M |
| 8406900080 | Parts for Other Than Steam Vapor Turbines | $7.7M |
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.
ImportsExports
Imports
$16.1MYoY · free account
Exports
$21.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $242.8M of Parts for Steam and Other Vapor Turbines and exported $297.0M.
Through August 2026. Source: U.S. Census Bureau.
Exports · August 2026
destination
customs district
origin
entry
rate provision · imports
29.4% enters free of duty; duty collected equals 11.74% of imports for consumption.