8708.99.31.00 - Double flanged wheel hub units incorporating ball bearings

This HTS category, 8708.99.31.00, specifically classifies double flanged wheel hub units that incorporate ball bearings. These units are integral components of vehicle wheel assemblies, providing the rotational support and connection between the wheel and the vehicle's axle or suspension system. The presence of both double flanges and integrated ball bearings is a key defining characteristic for classification under this subheading, ensuring precise alignment and smooth operation of the wheel.

This subheading distinguishes itself from its siblings by its specificity. For instance, 8708.99.27.00 covers vibration control goods containing rubber, a functionally different type of automotive part. Similarly, 8708.99.41.00 pertains to other parts for power trains, such as transmissions or drive shafts, which have a distinct role in vehicle propulsion. The general category of "Other" parts and accessories at 8708.99.48 is broader, encompassing a wide array of components not specifically enumerated elsewhere, making 8708.99.31.00 a precise designation for the described wheel hub units.

As this is a leaf node within the HTS structure, there are no further subcategories. Therefore, the focus remains on the precise definition of double flanged wheel hub units incorporating ball bearings. Classification under this subheading hinges on the composite nature of the unit, requiring both the double flange design for secure mounting and the integrated ball bearings for efficient rotation.