The Allis-Chalmers Model 6-12 was a farm tractor produced by Allis-Chalmers between 1918 and 1923. Like many other tractors of the era, its model name came from its horsepower ratings, with 6-12 (or 6/12) meaning hp (kW) at the drawbar and hp (kW) at the belt pulley. It had a LeRoi engine.