The Duff-Norton Air Motor jack Company’s product line includes heavy duty lifting devices with capacities to 150 ton. The Air Motor Jack product line consists of seven models with capacities of 20 to 100 Tons. Bossman Hydraulic Jacks are available in 50, 100, and 150 ton capacity ratings. Duff-Norton Jacks are used in a wide variety of applications in the railroad, mining, construction, and shipbuilding industries.