U.S. imports of Toothed Wheels, Chain Sprockets, and Other Transmission Elements; Parts (HS 848390) totaled $216.2M in August 2026, imported from 79 countries.
Importers of Toothed Wheels, Chain Sprockets, and Other Transmission Elements; Parts paid $48.6M in duties in August 2026, an average duty rate of 22.25% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataChain sprockets, gear blanks, and parts of gearboxes and speed changers are widely traded industrial inputs spanning sectors from wind energy to heavy machinery — and China is the dominant US import source, with Germany and Mexico also significant. The heading's 10-digit lines reflect meaningful commercial distinctions: forged chain sprockets (8483901010) versus non-forged (8483901050), forged gear blanks (8483905010), and a dedicated line for parts of gearboxes used in wind turbines (8483905020), which has drawn particular regulatory and trade-policy attention. Parts of bearing housings, plain shaft bearings, clutches, and flywheels are also captured here when presented separately. Importers should pay close attention to whether an article is a complete transmission element or a part, and whether it was forged, as these distinctions drive 10-digit classification.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
18.8K import shipments a month
Wind turbine gearbox parts (8483905020) were carved out as a distinct 10-digit line to enable targeted trade-policy and statistical tracking of this strategically important clean-energy input. The distinction matters for importers because duty treatment and any applicable trade-remedy measures may differ from the general gearbox-parts lines (8483905080/8483905090), so correct classification requires confirming the end-use application.
The forged designation (8483901010) applies when the sprocket blank was shaped by compressive force — hammer or press forging — rather than casting, machining from bar stock, or powder metallurgy. Importers should obtain mill or manufacturing certifications from the supplier documenting the production method, as CBP may request this documentation to verify the correct 10-digit line.
Subheading 2 of 7 in heading 8483
Subheading 848390 · $216.2M of $937.4M
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 |
|---|---|---|---|---|---|
| 8483905080 | Parts of Gearing, Gear Boxes and Other Speed Chang | $109.2M | 22.02% | 85.51% | $24.0M |
| 8483908080 | Pts Cltchs, Ply, Unvrsl Jts, Etc; NESOI | $44.7M | 24.24% | 93.71% | $10.8M |
| 8483901050 | Chain Sprockets and Parts, Except Forged | $22.6M | 13.29% | 80.25% | $3.0M |
| 8483905020 | Parts of Gear Boxes/Speed Chngrs for Wind Turbines | $10.4M | 26.73% | 99.75% | $2.8M |
| 8483908010 | Parts of Shaft Couplings, Except Universal Joints | $9.3M | 28.29% | 93.19% | $2.6M |
| 8483903000 | Parts of Brg Housings and Plain Shaft Brg, NESOI | $8.6M | 21.12% | 80.67% | $1.8M |
| 8483905010 | Forged Gear Blanks | $6.1M | 24.32% | 92.02% | $1.5M |
| 8483908040 | Pts Cltchs, Ply, Unvrsl Jts, Etc, Pts Unvrsl Jts | $4.6M | 30.46% | 99.66% | $1.4M |
| 8483901010 | Chain Sprockets and Parts, Forged | $1.7M | 22.26% | 99.11% | $383K |
| 8483902000 | Parts of Flange, Take-Up, Cartridge and Hanger Units | $859K | 17.52% | 88.99% | $151K |
| 8483907000 | Parts of Housed Brgs, Incorprtng Ball or Roll Brgs | $535K | 22.08% | 86.18% | $118K |
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.
Trade Directory
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ImportsExports
Imports
$216.2MYoY · free account
Exports
$155.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $2.4B of Toothed Wheels, Chain Sprockets, and Other Transmission Elements; Parts and exported $1.8B.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
China pays 43.4% duty; Mexico 13.3%.
customs district
destination
entry
rate provision · imports
10.2% enters free of duty; duty collected equals 22.25% of imports for consumption.