8406.90.50.00 - Rotors, finished for final assembly

This classification, HTS Code 8406.90.50.00, specifically covers rotors that are finished and ready for final assembly into steam turbines or other vapor turbines. These are components that have undergone all necessary manufacturing processes to be integrated into the operational machinery without further significant modification. The "finished for final assembly" designation implies that the rotor has achieved its intended dimensions, tolerances, and surface finishes, and any required balancing or impregnation has been completed.

Distinguishing this category from its siblings is crucial for accurate classification. Unlike HTS 8406.90.60.00, which includes rotors that are only cleaned or machined for preliminary purposes like fin removal or preparation for further processing, this code signifies a rotor that is beyond these initial stages. Furthermore, it differs from 8406.90.70.00, which exclusively pertains to blades (both rotating and stationary), and 8406.90.75.00, a residual category for other parts not otherwise specified. The key differentiator here is the advanced state of completion and readiness for immediate integration into a turbine.

As this is a leaf node within the HTS classification system, there are no further subcategories to introduce. Classification under 8406.90.50.00 relies on the definitive characteristic of the rotor being completely finished and prepared for its final placement and function within a turbine assembly.