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HSChapter 84
U.S. imports of toothed wheels, chain sprockets, and other transmission elements; parts (HS 848390) totaled $209.7M in April 2026, traded with 71 countries.
Importers of Toothed Wheels, Chain Sprockets, and Other Transmission Elements; Parts paid $50.8M in duties in April 2026 — an effective duty rate of 28% on $181.0M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 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.
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.
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8483905080 | PARTS OF GEARING, GEAR BOXES AND OTHER SPEED CHANG | $102.6M | 28.59% | $24.2M |
| 8483908080 | PTS CLTCHS,PLY,UNVRSL JTS,ETC;NESOI | $47.5M | 27.46% | $12.0M |
| 8483901050 | CHAIN SPROCKETS AND PARTS, EXCEPT FORGED | $22.6M | 16.55% | $3.1M |
| 8483905020 | PARTS OF GEAR BOXES/SPEED CHNGRS FOR WIND TURBINES | $10.7M | 43.81% | $4.6M |
| 8483903000 | PARTS OF BRG HOUSINGS AND PLAIN SHAFT BRG, NESOI | $7.8M | 26.92% | $1.7M |
| 8483908010 | PARTS OF SHAFT COUPLINGS, EXCEPT UNIVERSAL JOINTS | $6.3M | 32.59% | $1.9M |
| 8483905010 | FORGED GEAR BLANKS | $5.0M | 29.65% | $1.3M |
| 8483908040 | PTS CLTCHS,PLY,UNVRSL JTS,ETC,PTS UNVRSL JTS | $4.5M | 33.20% | $1.5M |
| 8483901010 | CHAIN SPROCKETS AND PARTS, FORGED | $1.7M | 19.23% | $307K |
| 8483902000 | PARTS OF FLANGE,TAKE-UP,CARTRIDGE AND HANGER UNITS | $612K | 23.82% | $133K |
| 8483907000 | PARTS OF HOUSED BRGS, INCORPRTNG BALL OR ROLL BRGS | $399K | 37.32% | $110K |
PARTS OF GEARING, GEAR BOXES AND OTHER SPEED CHANG
PTS CLTCHS,PLY,UNVRSL JTS,ETC;NESOI
CHAIN SPROCKETS AND PARTS, EXCEPT FORGED
PARTS OF GEAR BOXES/SPEED CHNGRS FOR WIND TURBINES
PARTS OF BRG HOUSINGS AND PLAIN SHAFT BRG, NESOI
PARTS OF SHAFT COUPLINGS, EXCEPT UNIVERSAL JOINTS
FORGED GEAR BLANKS
PTS CLTCHS,PLY,UNVRSL JTS,ETC,PTS UNVRSL JTS
CHAIN SPROCKETS AND PARTS, FORGED
PARTS OF FLANGE,TAKE-UP,CARTRIDGE AND HANGER UNITS
PARTS OF HOUSED BRGS, INCORPRTNG BALL OR ROLL BRGS
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8483905000 | PARTS OF GEARING, GEAR BOXES AND OTH SPEED CHANGER | $84.5M |
| 8483909500 | PARTS OF BRG HOUSING,PLAIN BRG,CLUTCHES,FLYWHL,ETC | $47.1M |
| 8483901000 | CHAIN SPROCKETS AND PARTS THEREOF | $13.8M |
| 8483908010 | PARTS OF SHAFT COUPLINGS, EXCEPT UNIVERSAL JOINTS | $6.9M |
PARTS OF GEARING, GEAR BOXES AND OTH SPEED CHANGER
2.3M kg
PARTS OF BRG HOUSING,PLAIN BRG,CLUTCHES,FLYWHL,ETC
1.4M kg
CHAIN SPROCKETS AND PARTS THEREOF
720.8K kg
PARTS OF SHAFT COUPLINGS, EXCEPT UNIVERSAL JOINTS
138.7K kg
DIGITAL PROCESSING UNITS, N.E.S.O.I.
HS 847150
PARTS & ACCESSORIES FOR ADP MACHINES & UNITS
HS 847330
PORT DIGTL AUTOMATIC DATA PROCESS MACH NOT > 10 KG
HS 847130
AUTOMATIC DATA PROCESSING STORAGE UNITS, N.E.S.O.I
HS 847170
AUTOMATIC DATA PROCESSING UNITS, N.E.S.O.I.
HS 847180
TURBOJET AND TURBOPROLLER PARTS
HS 841191
Supplier Network
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| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | $16.9M | $11.6M | -$5.2M |
| CHICAGO, IL | $15.8M | $12.4M | -$3.4M |
| LOS ANGELES, CA | $20.9M | $3.2M | -$17.6M |