HTS code 9902.16.39 covers "New alternators rated to produce voltage at 24 V and current at 500 A or more, designed to power military diesel engine components and supporting systems, such alternators each weighing less than 55 kg and measuring less than 300 mm in diameter (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.