CBP looks for objective evidence that the part is designed, marketed, and sold for use across machines in two or more of headings 8469–8472 without a principal-use association with any single heading. Useful documentation includes product catalogs listing multiple compatible machine types, engineering specifications showing interchangeability, and sales records showing purchases by users of different machine categories. A part that happens to fit multiple machines but is primarily sold for one type will generally be classified under the more specific subheading.

The US schedule separates printed circuit assemblies (8473503000) from parts and accessories of those assemblies (8473506000) and from other non-PCA parts (8473509000). This distinction matters because Section 301 tariff applicability and any applicable exclusions may differ by line. Importers should classify at the correct 10-digit level and verify the current Section 301 status for their specific line, particularly for goods of Chinese origin.