Step-Lap Joint Silicon Steel Laminations for Transformer Cores from Japan
Precision-cut silicon steel laminations designed with step-lap geometry for minimized joint losses in stacked transformer cores. Used in both distribution and power transformers for improved efficiency. Covered under HTS 8504.90.96.34 for stacked core laminations.
Duty Rate — Japan → United States
25%
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
• Include lamination stacking sequence diagrams showing step-lap pattern implementation
• Core loss test certificates (IEEE C57.12.90) validate electrical performance specifications
• Separate invoices for yoke vs. limb laminations to match transformer assembly requirements