Hardened Steel Inner Ring for Crystal Puller Bearings from Japan
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.
Duty Rate — Japan → United States
30.8%
Rate breakdown
9903.82.0925%Except as provided for in headings 9903.82.16, 9903.82.20–9903.82.26 and 9903.85.68, articles of copper and derivative aluminum and steel articles, as provided for in subdivisions (c)(vi)–(viii) and (xi) of U.S. note 16 to this subchapter
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• 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