HTS code 8408.20.10 covers "Compression-ignition internal combustion piston engines (diesel or semi-diesel engines) › Engines of a kind used for the propulsion of vehicles of chapter 87 › To be installed in tractors suitable for agricultural use" 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.