8406.10.10.00 - Steam turbines

This HTS category, 8406.10.10.00, specifically covers steam turbines and other vapor turbines that are designed and intended for marine propulsion. These machines harness the thermal energy of steam or other vapors to generate rotational mechanical power, which is then directly or indirectly used to propel watercraft such as ships, boats, and submarines. The primary function of turbines classified here is to provide motive force for maritime vessels.

This classification is distinguished from its sibling, 8406.10.90.00 ("Other"), which would encompass steam and vapor turbines not intended for marine propulsion. Therefore, the critical differentiator is the intended application: turbines for propelling ships fall under 8406.10.10.00, while turbines used in power generation, industrial processes, or other non-marine applications would be classified elsewhere.

As this is a leaf node in the HTS structure, there are no further subcategories within 8406.10.10.00. Classification at this level relies on confirming that the turbine's design and intended use align with the requirements for marine propulsion. This may involve examining technical specifications, original equipment manufacturer (OEM) documentation, or import declarations that clearly state the intended application of the turbine.