8607.19.30.20 - Side frames

HTS Code 8607.19.30.20 specifically classifies "Side frames" as components of railway or tramway rolling stock truck assemblies. These frames are essential structural elements that form the primary framework of a truck, supporting the axle boxes and connecting the wheels to the undercarriage of a railway car or locomotive. They are designed to withstand the significant dynamic forces encountered during train operation.

This classification is distinct from its sibling categories. "Bolsters" (8607.19.30.10) are typically centrally located components that transfer vertical loads from the car body to the truck and provide rotational capabilities for negotiating curves. "Other" components at this level (8607.19.30.90) would encompass any parts of truck assemblies not specifically identified as side frames or bolsters.

As this is a leaf node, there are no further subcategories. The classification of "Side frames" at this level is based on their specific function and form as a fundamental part of the truck assembly of vehicles of heading 8605 or 8606. Proper classification relies on identifying these components as the lateral structural members of the truck frame.