8409.91.10.80 - Other

This HTS sub-category, 8409.91.10.80, encompasses "Other" cast-iron parts that are specifically designed for use with spark-ignition internal combustion piston engines (including rotary engines). The key defining characteristic of items within this classification is their material and the extent of their processing. These parts must be made of cast iron and should not have undergone any processing beyond basic cleaning. Furthermore, any machining performed must be limited to the removal of casting imperfections such as fins, gates, sprues, and risers, or to prepare the part for subsequent finishing operations. This precise level of processing is crucial for accurate classification.

This classification distinguishes itself from its siblings by its specific limitations on material processing. While 8409.91.10.40 covers parts for specific types of vehicles and 8409.91.10.60 pertains to marine propulsion engines, this particular sub-category focuses solely on the *type* of part (cast-iron) and the *degree* of its manufacturing, irrespective of its end-use vehicle or engine application, as long as it's for a spark-ignition internal combustion piston engine. It specifically excludes parts that have undergone more extensive machining or are made from materials other than cast iron.

As this is a leaf node within the HTS structure, there are no further subcategories that subdivide this specific classification. Therefore, all cast-iron parts meeting the described criteria, and not falling under more specific sibling categories, will be classified here. This means that the physical characteristics and the limited scope of manufacturing processes are the sole determinants for classification under 8409.91.10.80.