Crystal Boule Grinder Collet Chuck
Adjustable collet chuck attachment that mounts on crystal grinders (heading 8429 equipment) to securely hold semiconductor boules during diameter grinding and flat notching for wafer preparation. Made of hardened steel or carbide. Classified in 8431.49.9020 as other machinery mounting attachment.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for use with metalworking lathes rather than specialized crystal grinders
Parts for general metalworking machinery fall under heading 8466.
If imported as hand tool accessory rather than power machinery mount
Interchangeable hand-operated collets/tools shift to tools.
If basic steel fabricated article without precision machining
Other steel articles default to chapter 73 if not identifiable machinery parts.
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Import Tips & Compliance
• Include grind tolerance specs (±0.01mm) in invoices to prove semiconductor precision
• Pair with boule grinder photos/install diagrams for smooth customs clearance
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