Brushes Constituting Parts of Machines, Appliances or Vehicles

CBP applies the GRI and relevant chapter notes: the brush must be identifiable as a part specifically designed for use with a particular machine, appliance, or vehicle — not merely capable of such use. A brush sold as a standalone cleaning tool that could incidentally be used on a machine would typically classify elsewhere. Documentation such as engineering drawings, OEM part numbers, or machine-specific design specifications strengthens a 9603.50 classification claim.

Potentially, yes. If the brush's primary material by value or weight is steel or aluminum — for example, a steel-wire brush wheel — CBP may assess whether Section 232 tariffs apply to the steel or aluminum content. However, classification under 9603.50 as a finished brush part generally governs the applicable HTS duty; Section 232 applicability depends on the specific product and its material composition. A customs broker should evaluate each product individually.