lookup_tariff

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Look up current U.S. import tariff rates on manufacturing materials, components, and equipment: statutory HTS duty rates (MFN, special programs, Section 301/232 flags) and the effective rate importers actually paid (calculated duties / customs value), plus the implied import price ($/kg or $/unit) for single-unit material families, top source countries with market shares, and a sourcing-concentration verdict (HHI). Query by keyword ('fasteners', 'aluminum'), family key ('steel-fasteners'), or HTS code/prefix ('7318' or '7318.15.20'). Reference data from USITC, not a customs ruling — cite the returned url. Try: {"query":"steel"}