Silicon-Coated Steel Hairspring
A steel hairspring with silicon coating for anti-magnetic properties in modern mechanical watches, maintaining traditional spiral form. The base material is iron or steel wire, and the coating does not change its essential character as a spring. This product is classified under tariff item 7320.90.00 as an 'other' spring of iron or steel.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | +50.0% | 50% |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as a component of a watch movement
Watch springs are excluded from Chapter 73 and fall under heading 91.14.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the product is classified based on its base material (steel) and function as a spring
• Provide a clear description of the coating and its purpose
• Verify the duty rate and any applicable trade agreements
Related Products under Tariff item 7320.90.00
Anti-Shock Breguet Hairspring
A specialized hairspring for mechanical watch movements, made from steel wire and featuring a Breguet terminal curve for improved isochronism. It is designed to regulate the oscillation of the balance wheel, ensuring accurate timekeeping. This product falls under tariff item 7320.90.00 as an 'other' spring of iron or steel, not being a leaf spring or a clock or watch spring of heading 91.14.
Belleville Disc Spring
A conical disc-shaped steel spring that stacks for high load capacity, used in bolted joints and safety valves. It is a spring of iron or steel, not being a leaf spring or a clock/watch spring. This product is classified under tariff item 7320.90.00 as an 'other' spring.
Bowed V-Spring Washer
A V-profile steel washer spring providing light axial force in assemblies. It is a spring of iron or steel, not being a leaf spring or a clock/watch spring. This product falls under tariff item 7320.90.00 as an 'other' spring.
Brelet Breguet Overcoil Hairspring
A premium Breguet-style overcoil hairspring for chronometer-grade watches, crafted from high-elasticity steel to minimize isochronism errors. It is a specialized spring used in mechanical timepieces to regulate balance wheel oscillation. This product is classified under tariff item 7320.90.00 as an 'other' spring of iron or steel.
Cantilever Spring Arm
A single-arm steel spring deflecting under load for parking brakes and levers. It is a spring of iron or steel, not being a leaf spring or a clock/watch spring. This product is classified under tariff item 7320.90.00 as an 'other' spring.
Carbon Steel Extension Spring
A wire-formed extension spring made of carbon steel, featuring loops at each end for tensile applications in tools and appliances. It is classified under tariff item 7320.90.00 as an 'other' spring of iron or steel, distinct from leaf springs or vehicle-specific springs.