Precision-engineered springs — including compression, extension, torsion, and flat leaf varieties — are foundational components in automotive suspensions, industrial machinery, medical devices, and electronics. Spring classification in trade hinges on material (carbon steel, stainless, non-ferrous alloy), coil geometry, and load specification, all of which influence both HTS assignment and applicable duty treatment. Imports of steel springs may carry Section 232 tariff exposure, and antidumping orders have historically targeted certain spring types from specific origins, making origin verification a compliance priority. Buyers sourcing to tight tolerance specifications should confirm that foreign suppliers' quality documentation aligns with ASTM or equivalent standards.

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