Hardened Steel Inner Ring for Crystal Puller Bearings
High-hardness alloy steel inner ring for thrust ball bearings in Czochralski crystal pullers, enabling rotation of the seed crystal during monocrystalline silicon boule growth. Essential for maintaining precise speeds under extreme thermal conditions in semiconductor material production. Falls under 8482.99.25 as an other bearing ring not specified elsewhere.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as complete bearing assembly
Assembled with balls/rollers, it becomes a full thrust ball bearing under 8482.40 rather than separate parts.
If exclusively for ball type bearings
Inner rings purpose-built for ball bearings shift to the ball-specific subheading from 'other'.
If as part of semiconductor processing machines
Integral components of crystal growers/pullers classify with the complete machine in 8479 for semiconductor use.
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Import Tips & Compliance
• Provide heat treatment and hardness certification (e.g
• Rockwell scale) to substantiate suitability for semiconductor equipment
• Declare end-use in Chapter 84 statistical notes for potential duty relief on semiconductor manufacturing parts
• Watch for reclassification as complete crystal grower parts under 8479 if not imported separately
Related Products under HTS 8482.99.25
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Ceramic-Coated Outer Race for Wafer Grinder Spindles
Advanced ceramic-coated steel outer race for angular contact ball bearings in wafer grinders, ensuring minimal particle generation during crystal boule diameter grinding. Critical for achieving precise flats indicating conductivity type in semiconductor wafers. HTS 8482.99.25 covers such specialized other bearing races.
Titanium Alloy Outer Ring for Float Zone Crystal Growers
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Carbide-Enhanced Inner Race for Wafer Slicing Spindles
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High-Temp Outer Race for Czochralski Puller Thrust Bearings
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Nano-Polished Inner Ring for Semiconductor Wafer Lappers
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