4010.31 - Endless transmission belts of trapezoidal cross section (V-belts),V-ribbed, of an outside circumference exceeding 60 cm but not exceeding 180 cm:

This HTS category, 4010.31, specifically classifies endless transmission belts constructed from vulcanized rubber that have a trapezoidal cross-section (commonly known as V-belts). A key defining characteristic for inclusion in this subcategory is that these V-belts must be of the V-ribbed type, meaning they feature multiple longitudinal ribs on their inner surface. Furthermore, their outside circumference must fall within a specific range, exceeding 60 cm but not exceeding 180 cm. These belts are designed for efficient power transmission in various mechanical systems.

Within the broader heading of conveyor or transmission belts, this classification is distinct from its siblings primarily by the combination of being V-ribbed and falling within the specified circumference range. For instance, HTS 4010.32 covers non-V-ribbed trapezoidal cross-section belts of the same circumference range, while 4010.33 and 4010.34 address V-ribbed and non-V-ribbed V-belts, respectively, within a different circumference bracket (180 cm to 240 cm). Synchronous belts, characterized by teeth for positive engagement, are classified under separate codes (e.g., 4010.35 and 4010.36).

The subcategories under 4010.31 further refine the classification based on material composition. The subdivision 4010.31.30.00 is for V-ribbed belts that are combined with textile materials, indicating the presence of reinforcement or specific fabric components within the belt construction. In contrast, 4010.31.60.00 encompasses "Other" V-ribbed belts within the specified circumference range, typically referring to those made solely of vulcanized rubber or other materials not primarily textile-based.