HTS code 9902.16.40 covers "Used generators (alternators) of a kind used in conjunction with spark ignition or compression ignition internal combustion engines (provided for in subheading 8511.50.00)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.