8411.99.90.30 - Rotors or spindles and rotor or spindle assemblies

This HTS category, 8411.99.90.30, specifically covers rotors or spindles, and assemblies thereof, designed for use as parts of gas turbines, excluding those intended for aircraft propulsion. These components are critical rotating elements that facilitate the operation of gas turbines by converting energy from the working fluid into mechanical power. The scope includes dynamically balanced rotors and spindles, as well as pre-assembled units where the rotor or spindle is integrated with other components like bearings or housings, provided they are not for aircraft applications.

Within the broader category of "Parts" for gas turbines, this subdivision distinguishes itself by focusing on the core rotating elements and their direct assemblies. It is distinct from other "Other" parts that might include stationary components, fuel systems, or control mechanisms, and importantly, it excludes parts classified under the specific subheadings for aircraft gas turbines. The emphasis here is on the specific function and physical form of rotors and spindles as key power-generating components within non-aircraft gas turbines.

As this is a leaf node within the HTS, there are no further subcategories to introduce. Classification under 8411.99.90.30 therefore hinges on whether the part is identifiable as a rotor or spindle assembly for a gas turbine, and crucially, that it is not intended for use in aircraft. The absence of specific subheadings means that this designation captures all remaining rotors, spindles, and their assemblies for non-aircraft gas turbines not otherwise specified.