Music Wire Extension Spring
An extension spring made from high-carbon music wire, featuring loops at both ends for attachment and providing force when stretched. It is classified as an 'other' spring of iron or steel under tariff item 7320.90.00, distinct from compression springs.
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 the spring is helical in shape
Helical springs, including extension types, fall under 7320.20.00.
If the spring is a leaf spring
Leaf springs are classified under 7320.10.00, not as other springs.
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
• Verify the wire diameter is 16 mm or less to meet Chapter 73's wire definition
• Include technical drawings showing the loops and dimensions to avoid classification disputes
• Check if the spring is part of a larger article that may shift classification
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
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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.