The Allis Chalmers HB-112 is a garden tractor introduced in 1968 as part of the B Series. It features a 12 hp Briggs & Stratton 494cc 1-cylinder gasoline engine with air-cooled horizontal-shaft design. The tractor uses a hydrostatic transmission with infinite forward and reverse speeds. It has a wheelbase of 48 inches and a shipping weight of 745 lbs. The HB-112 is a two-wheel drive tractor with manual steering and an open operator station. Electrical system includes a 12-volt battery with starter-generator charging. It was built in Lexington, South Carolina, USA.