Glucydur Balance Spring for Chronograph Watches from Mexico
Glucydur alloy balance spring optimized for high-frequency chronograph movements (4Hz operation). Classified in HTS 9114.90.34.00 as a hairspring for watch timekeeping regulation.
Duty Rate — Mexico → United States
17.3%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Specify balance wheel material compatibility in technical docs; alloy pairs affect classification
• Frequency certification (beats per hour) proves watch movement application
• Avoid generic 'spring' labeling; use 'hairspring for watch movements' explicitly