Boule Grinder Workhead Assembly
A complete workhead assembly for a boule grinder, including motor, spindle, and stroke mechanism, used to advance crystal boules against grinding wheels with micron-level diameter control. This is a major replacement part for semiconductor grinders that prepare silicon boules for wafer slicing, falling under parts of machinery for preparing printing components by analogy to precision shaping equipment.
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 the workhead is presented separately as a general-purpose machine part not specifically for printing machinery.
Heading 84.66 covers parts and accessories for machine-tools, which may apply if the workhead is not identifiable as a part of printing machinery.
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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 workhead is declared as a part of machinery for preparing printing components, not as a complete machine, to avoid misclassification
• Provide a detailed technical description and original manufacturer documentation to support the tariff classification
• Verify whether the item qualifies for duty relief under any applicable trade agreements by checking the Certificate of Origin
Related Products under Tariff item 8442.40.00
Crystal Boule Grinder Spindle Assembly
A high-precision spindle assembly for crystal grinders that shape semiconductor boules to exact wafer diameters and grind orientation flats, featuring air bearings for vibration-free operation. This is a replacement part for grinding machinery used in preparing semiconductor materials, classified under parts of machinery for preparing printing components due to its precision shaping function.
Crystal Puller Seed Holder Chuck
A graphite or quartz seed holder chuck that precisely positions a seed crystal during Czochralski crystal growth, critical for consistent boule diameter control. This is a part of crystal growing equipment used to produce semiconductor boules, classified under parts of machinery for preparing printing components by analogy to precision positioning apparatus.
Crystal Puller Vacuum Chamber Lid
A stainless steel vacuum chamber lid with viewport and ports for Czochralski crystal pullers, maintaining an argon atmosphere during growth with a double O-ring seal design. This is a structural part of crystal growing equipment used in semiconductor boule production, classified under parts of machinery for preparing printing components.
Czochralski Crystal Puller Replacement Heating Element
A graphite or molybdenum heating element that is a critical replacement part for Czochralski crystal pullers, providing precise temperature control during semiconductor boule growth. This is a part of crystal growing equipment used to produce silicon ingots, classified under parts of machinery for preparing printing components.
Float Zone Crystal Grower RF Heating Coil
A radio frequency induction coil for float zone crystal growers that produce ultra-pure silicon ingots without crucibles, enabling zone refining for high-resistivity wafers. This is a part of semiconductor crystal growing equipment, classified under parts of machinery for preparing printing components.
Semiconductor Crystal Grinder Diamond Dresser
A single-crystal diamond dresser tool for truing and dressing grinding wheels in semiconductor boule grinders, ensuring consistent wheel profile for precise flat grinding. This is a replacement part for wafer preparation grinders, classified under parts of machinery for preparing printing components.