7320.10 - Leaf springs and leaves therefor:

This HTS category, 7320.10, specifically covers leaf springs and individual leaves intended for use in leaf spring assemblies. Leaf springs are characterized by their layered construction, typically consisting of multiple flat bars of spring steel stacked and bound together. These springs function by deforming under load, absorbing shock and providing suspension in various applications.

In contrast to sibling categories, 7320.20 pertains to helical springs, which are coiled rather than layered, and 7320.90 encompasses all other types of springs made of iron or steel not falling into the leaf or helical categories. Therefore, the defining characteristic of 7320.10 is the specific construction and form factor of the spring as a series of parallel, curved leaves.

Subdivision within this category, such as 7320.10.90 for "Other," often serves to distinguish between specific types of leaf springs or leaves based on their intended use, such as those specifically designed for motor vehicle suspension systems. This further refinement allows for more precise tariff application based on the end-application and specific design features of the leaf spring.