Silicon-Coated Steel Hairspring from Mexico
Steel hairspring with silicon coating for anti-magnetic properties in modern mechanical watches, maintaining traditional spiral form. Classified in HTS 7320.90.1000 as base material is iron/steel wire hairspring, coating considered secondary treatment.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Document coating as <5% total weight to preserve steel classification; heavy coatings risk non-ferrous shift
• Test for magnetic permeability to distinguish from pure silicon hairsprings under Chapter 71
• Use material safety data sheets (MSDS) for coated products to address any hazmat concerns