4010.35.90.00 - Other

This HTS category, 4010.35.90.00, specifically covers endless synchronous belts made of vulcanized rubber with an outside circumference greater than 60 cm but not exceeding 150 cm, which are not combined with textile materials. These belts are designed for transmitting power in machinery and are characterized by their continuous loop construction and internal toothing or grooving that meshes with pulleys to ensure precise synchronization and prevent slippage. The classification hinges on the material composition (vulcanized rubber), the construction (endless synchronous), and the specified dimensional range for circumference.

This category is distinct from its sibling, "Combined with textile materials," which would encompass synchronous belts where textile reinforcement or covering is an integral part of the belt's construction. The absence of textile components is the key differentiator here, meaning that any significant textile presence would lead to classification under the sibling heading.

As this is a leaf node, there are no further subcategories. Therefore, classification within 4010.35.90.00 is final for qualifying endless synchronous rubber belts of the specified dimensions that do not incorporate textile materials. Examples include power transmission belts used in automotive engines, industrial machinery, and automated equipment where precise timing is critical.