Staples in strips — whether for office staplers, upholstery guns, or similar tools — fall under 830520 as a distinct subheading. Loose or bulk staples not in strip form, or staples used as structural fasteners, may classify elsewhere; the strip format and intended office or upholstery use are the key classification criteria.

Yes, most base metal office articles in this heading originating from China are subject to Section 301 measures. Importers sourcing from South Korea, Thailand, Malaysia, or Taiwan should verify the specific tariff line and country of origin to determine whether those measures apply.