Couplings, clutches, universal joints, flywheels, pulleys, and similar mechanical linkage components form the connective tissue of industrial drivetrain systems across virtually every manufacturing and processing sector. Classified broadly under HTS Chapter 84, these components vary widely in material, torque rating, and precision grade — factors that can shift both the applicable tariff subheading and the trade-remedy exposure, particularly for imports from China subject to Section 301 measures. MRO and OEM buyers should pay close attention to whether components are imported individually or as part of a larger assembly, as that distinction drives classification.

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