The Satoh ST-1640 is a compact utility tractor produced from 1977 to 1980 by Satoh. It features a Mitsubishi 1.0L 4-cylinder liquid-cooled diesel engine producing 15.8 hp (11.8 kW). The tractor has a 9-speed gear transmission with 9 forward and 3 reverse gears and is equipped with four-wheel drive.