4010.31.30.00 - Combined with textile materials

This HTS classification covers endless transmission belts specifically designed for applications requiring a trapezoidal cross-section, commonly known as V-belts. These belts are further defined by their dimensions, with an outside circumference that is greater than 60 cm but does not exceed 180 cm. The key characteristic for inclusion here is the trapezoidal shape of the belt's cross-section, which allows it to seat securely within corresponding V-grooves on pulleys for efficient power transmission.

This category is distinguished from its sibling category, 4010.31.60.00 ("Other"), by its precise definition of the belt's cross-sectional shape and its specific size range. While the "Other" category would encompass transmission belts not meeting the trapezoidal cross-section requirement or falling outside the specified circumference range, this node exclusively pertains to V-belts within the defined dimensional parameters. The material must be vulcanized rubber, and these belts are specifically designed for transmitting power between rotating shafts.

As this classification represents a leaf node, there are no further subcategories. Classification decisions within this code rely on confirming that the belt is indeed an endless transmission belt of vulcanized rubber with a trapezoidal cross-section and that its external circumference falls strictly between 60 cm and 180 cm, inclusive of the lower bound and exclusive of the upper bound. The "Combined with textile materials" descriptor within the description clarifies that such reinforcing textile components, when integral to the belt's structure for strength and durability, do not preclude classification under this heading, provided the primary material and form meet the criteria.