8413.91.90.60 - Other

This HTS category, 8413.91.90.60, specifically covers "Other" parts for hydraulic fluid power pumps. It acts as a residual category for components that are not explicitly defined under other subheadings within the "Parts of pumps" classification. This includes a wide array of miscellaneous parts that contribute to the functioning of hydraulic pumps, provided they are designed for this specific purpose.

Distinguishing this category from its sibling, 8413.91.90.55 ("Fluid end blocks"), is crucial. Fluid end blocks are specialized components designed to house and seal pump elements like pistons or plungers, forming the primary chamber for fluid intake and discharge. Category 8413.91.90.60, conversely, encompasses parts that are not fluid end blocks, such as shafts, bearings, seals (other than those integral to the fluid end block), casings, mounting brackets, and other auxiliary components that support or enable the operation of the hydraulic pump.

As this is a leaf node in the HTS, there are no further subcategories to introduce. Classification under this subheading relies on the process of elimination – if a part is for a hydraulic fluid power pump and is not specifically classified elsewhere at a more detailed level, it will fall into this "Other" category. The primary classification criteria remain the intended use as a part for hydraulic fluid power pumps and its physical characteristics, ensuring accurate customs declarations and duty assessment.