U.S. imports of Gears, Gear Boxes, Speed Changers, Ball or Roller Screws, and Torque Converters (HS 848340) totaled $306.9M in August 2026, imported from 90 countries.
Importers of Gears, Gear Boxes, Speed Changers, Ball or Roller Screws, and Torque Converters paid $47.0M in duties in August 2026, an average duty rate of 14.60% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataGear boxes and speed changers for wind turbines are explicitly carved out at 8483405020, reflecting the renewable energy sector's growing demand for high-torque, precision gearing—a commercially significant distinction from general industrial speed changers. India leads US import supply for this heading, followed by Italy and Germany, a mix that spans both high-volume commodity gearing and precision European drivetrain components. The heading also covers ball and roller screws (8483408000), which are critical motion-control components in CNC machine tools and semiconductor manufacturing equipment, and torque converters (8483401000) used in automatic transmissions. Section 301 tariffs apply to Chinese-origin shipments, and importers of wind turbine gearboxes should verify whether Section 232 steel and aluminum tariffs affect the material content of their assemblies.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
11.2K import shipments a month
Ball screws and roller screws are explicitly classified at 8483408000. They differ from conventional lead screws in that they use recirculating balls or planetary rollers between the screw and nut to achieve high efficiency and low backlash—characteristics essential for CNC and precision positioning applications. A standard lead screw relying on sliding contact between screw and nut would not classify here; it would more likely fall under a general mechanical parts heading depending on its material and application.
To support classification under the wind turbine gearbox line, importers should retain the manufacturer's application specification confirming the unit is designed and rated for wind turbine service, along with the purchase order or contract referencing the turbine model. CBP may also consider whether the gearbox's torque rating, mounting interface, and lubrication system are specific to wind turbine duty cycles. A general-purpose industrial gearbox that happens to be installed in a wind turbine would not automatically qualify for this dedicated line.
Subheading 1 of 7 in heading 8483
Subheading 848340 · $306.9M of $937.4M
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 |
|---|---|---|---|---|---|
| 8483405010 | Fixed Ratio Speed Changers, NESOI | $123.6M | 8.47% | 56.70% | $10.5M |
| 8483409000 | Gears, Exc Transmission Elements, Entered Separate | $56.3M | 21.40% | 92.53% | $12.1M |
| 8483405020 | Gear Boxes and Speed Changers for Wind Turbines | $52.2M | 28.10% | 100.00% | $14.7M |
| 8483407000 | Speed Changers, NESOI | $36.9M | 7.60% | 83.88% | $2.8M |
| 8483405080 | Multiple and Variable Ratio Speed Changers, NESOI | $26.0M | 13.63% | 89.31% | $3.5M |
| 8483408000 | Ball or Roller Screws | $13.2M | 11.08% | 89.83% | $1.5M |
| 8483401000 | Torque Converters | $10.1M | 15.79% | 56.19% | $1.6M |
| 8483403080 | Speed Changers, NESOI, F Pulp, Paper, Paperbrd Mach | $2.4M | 11.75% | 89.84% | $288K |
| 8483403040 | Fixed Ratio Spd Chngrs F Pulp, Paper, Paperbrd Mach | $1.4M | 10.10% | 89.73% | $138K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
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
$306.9MYoY · free account
Exports
$156.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $3.5B of Gears, Gear Boxes, Speed Changers, Ball or Roller Screws, and Torque Converters and exported $2.1B.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
China pays 41.2% duty; Italy 8.4%.
customs district
destination
entry
rate provision · imports
20.4% enters free of duty; duty collected equals 14.60% of imports for consumption.