8406.90.30.00 - Rotors, not further advanced than cleaned or machined for removal of fins, gates, sprues, and risers, or to permit location in finishing machinery

This HTS category, 8406.90.30.00, specifically covers rotors for steam turbines and other vapor turbines that have undergone initial machining. This includes processes such as cleaning, or machining to remove fins, gates, sprues, and risers. Furthermore, it encompasses rotors that have been machined to facilitate their placement within finishing machinery. The key characteristic is that these rotors are not yet fully finished for final assembly or integration into the turbine.

Distinguishing this category from its sibling, 8406.90.20.00, is crucial. While both deal with rotors, 8406.90.20.00 pertains to rotors that are *finished* for final assembly. In contrast, 8406.90.30.00 addresses rotors that are in an intermediate state of processing, having undergone preliminary machining for specific purposes but not yet reaching their final form or readiness for integration. This distinction hinges on the degree of finishing and the intended next step in the manufacturing or assembly process.

As this HTS classification represents a leaf node, there are no further subcategories. Therefore, the classification hinges entirely on the specific nature of the rotor's machining and its stage of completion. Examples of items falling under this heading would include rotors with rough casting imperfections removed, or those precisely machined to accept mounting hardware or guide them into subsequent automated finishing stations, but prior to final balancing or surface treatments.