Die-cast zinc parts that perform a function covered by a more specific chapter — such as a zinc pump housing classified with pumps, or a zinc fitting classified with plumbing goods — follow the specific chapter. Only parts and articles with no more specific classification land in 7907. A binding ruling from CBP is the most reliable way to confirm placement for high-volume items.

Zinc sacrificial anodes used for cathodic protection are generally classified here as articles of zinc not elsewhere specified, provided they are not more specifically described by another heading. Importers should verify the specific 10-digit tariff line and confirm whether any antidumping orders apply to anodes from the country of origin.