8409.91.92 - For marine propulsion engines

This category, HTS 8409.91.92, encompasses parts and accessories specifically designed for marine propulsion engines that fall under headings 8407 or 8408. These are not complete engines themselves but rather components essential for their operation in a marine environment. This includes a broad range of parts, excluding those explicitly defined under other subheadings.

To differentiate from its sibling categories, HTS 8409.91.92 covers parts for marine engines generally. The sibling category "To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704" is exclusively for parts intended for land vehicles. Similarly, the sibling "Other" (8409.91.99) would likely encompass parts not specifically designated for marine use nor for the aforementioned land vehicle categories.

Within this classification, further subcategories exist to refine the classification of specific marine engine parts. HTS 8409.91.92.10 specifically identifies "Connecting rods," a critical component of internal combustion engines. The remaining parts not specified under this or other more granular subheadings are captured under the residual category HTS 8409.91.92.90, "Other," ensuring all relevant marine engine parts are appropriately classified.