8410.90.00.00 - Parts, including regulators

This HTS category, 8410.90.00.00, encompasses all parts, components, and accessories specifically designed for use with hydraulic turbines and water wheels, as well as regulators associated with these machines. This includes a broad range of items such as shafts, bearings, casings, guide vanes, runners, seals, and various control mechanisms that are integral to the operation or maintenance of hydraulic turbines and water wheels. The inclusion of "regulators" within this "parts thereof" designation signifies that components specifically intended for the control and regulation of hydraulic turbine and water wheel speed and power output are also classified here.

It is important to distinguish this category from its sibling, 8410.10.00.00, which covers the complete hydraulic turbines and water wheels themselves. While 8410.10.00.00 pertains to the finished, functional machinery, 8410.90.00.00 focuses solely on the individual components and subassemblies that make up these machines or their regulating systems. Therefore, if an item is a standalone, operational turbine or water wheel, it would fall under the sibling category, whereas any part solely intended for such machinery would be classified here.

As this is a leaf node in the HTS classification system, there are no further subcategories within 8410.90.00.00. Classification at this level is determined by whether the article is specifically a part or regulator intended for use with the machinery described in heading 8410. The nature of the material, the physical form, and the demonstrable function as a component or regulating element for hydraulic turbines and water wheels are the primary criteria for classification under this heading.