Constant Force Spring
A pre-stressed steel strip spring providing near-constant force over travel distance, used in retractable cords or tape measures. Falls under HTS 7320.90.50.60 as other iron or steel springs due to its unique design not matching leaf or vehicle types.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If in coils for mattresses or furniture
Coil springs specifically for bedding/furniture have separate subheading.
If parts of machines not elsewhere specified
Unnamed machine springs may fall under general machinery parts.
If for medical instruments
Springs in medical devices classify with the device heading.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Specify if strip-formed from sheet steel vs. wire to confirm Chapter 73 scope
• Provide engineering drawings showing spring function for valuation
Related Products under HTS 7320.90.50.60
Belleville Disc Spring
Conical disc spring from hardened steel for high-load, short deflection applications like bolted joints. Under HTS 7320.90.50.60 as other steel springs.
Volute Spring
Cone-shaped compression spring from steel strip for heavy shock absorption in railway buffers. HTS 7320.90.50.60 for other iron/steel springs.
Garoll Spring Retractor
Negator-style constant force spring for seat belt retractors (non-vehicle). Other steel springs in 7320.90.50.60.
Hairpin Torsion Spring
U-shaped torsion spring from steel wire for light-duty hinges. HTS 7320.90.50.60 other springs.
Clock Spring Mechanism
Spiral torsion spring for clockwork toys (non-precision). Other in 7320.90.50.60.
Snap Action Spring
Bimetallic or steel snap disc for thermostats. HTS 7320.90.50.60 other.