Gallium Arsenide Crystal Puller Gearbox
A gearbox assembly used in crystal pullers that produce gallium arsenide monocrystalline boules for compound semiconductor wafers. It is a part suitable solely or principally for use with hoisting or winch machinery of heading 84.25, specifically the pulling mechanism that raises the growing crystal. This gearbox transmits power to control the precise withdrawal rate of the crystal from the melt.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported separately as a general gearbox not dedicated to a specific machine
Gearboxes are classified as transmission shafts and gears under heading 84.83 when not identifiable as parts of a particular machine.
If the gearbox is part of a complete crystal pulling machine rather than a separate part
Complete machines for growing crystals may be classified as functional units under heading 84.79.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the gearbox is declared as a part of machinery of heading 84.25, not as a general transmission component
• Have technical documentation ready to demonstrate its sole or principal use with crystal pulling machinery
• Verify whether the gearbox qualifies for preferential tariff treatment under a free trade agreement by checking the country of origin
Related Products under Tariff item 8431.10.00
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A drive capstan for grinding flats on crystal boules to indicate conductivity type. This product is a part suitable for use solely or principally with machinery of heading 84.25, specifically capstans used in semiconductor boule grinding equipment.
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CMP Polisher Carrier Capstan
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CMP Polisher Platen Assembly
A rotating platen that holds the polishing pad in chemical mechanical planarization (CMP) tools for wafers. This platen is a part of the machinery of heading 84.25, as it is an integral component of wafer polishers that use hoisting or lifting mechanisms. It ensures uniform pressure distribution for consistent polishing.
Crystal Boule Grinder Capstan Drum
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Crystal Boule Grinder Hoist Assembly
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