8411.91.10 - Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

This HTS category, 8411.91.10, specifically covers cast-iron parts intended for use in turbojets or turbopropellers, provided these parts have not undergone significant advanced processing. The classification applies to items that are either in their basic form after cleaning or have been machined only to remove casting imperfections such as fins, gates, sprues, and risers. This machining is also permitted if it is solely to facilitate their placement within finishing machinery, indicating a focus on raw or semi-finished cast-iron components.

This subcategory is distinct from its sibling, 8411.91.90, which encompasses all other parts of turbojets or turbopropellers that do not meet the specific criteria of being cast-iron and only minimally machined as described. The emphasis here is on the material (cast iron) and the limited scope of manufacturing processes applied.

Within this category, further subdivisions exist to differentiate based on the ultimate application of the turbine parts. One key distinction is made between parts intended for non-aircraft turbines (8411.91.10.40) and those destined for aircraft turbines. This bifurcation is crucial for customs purposes as aircraft-related components often have distinct regulatory and tariff treatments.