9114.90.34.00 - For watches

This HTS classification, 9114.90.34.00, specifically designates hairsprings for watches. A hairspring, also known as a balance spring, is a critical component of mechanical watches responsible for regulating the oscillation of the balance wheel, thereby controlling the accuracy of timekeeping. This category encompasses only these specialized springs, distinct from other watch parts.

The distinction between this category and its sibling, 9114.90.38.00 "Other," lies in the precise nature of the item. While 9114.90.38.00 would cover any other watch parts not specifically enumerated elsewhere, 9114.90.34.00 isolates hairsprings due to their unique function and material properties, which often include specialized alloys designed for elasticity and thermal stability. This level of specificity aids in accurate tariff application for this particular component.

As this is a leaf node within the HTS structure, there are no further subcategories for this specific classification. The scope is therefore limited to hairsprings used in watches, and any variations in material or size within this functional definition would still fall under this heading. Careful consideration of the primary use and specific form of the spring is paramount for correct classification under this heading.