SMI Crankshaft LLC (formerly Norton Manufacturing Company) is a world leader in the manufacturing of precision-machined crankshafts used in engines, pumps and compressors.

SMI Crankshaft is the only crankshaft manufacturer in the world to offer complete vertical integration of its crankshaft manufacturing.

Steel making, forging, and machining and heat treatment are all provided by SMI Crankshaft or subsidiaries of Sumitomo Metal Industries, Ltd. This vertical integration ensures full control over the manufacturing process, resulting in consistently high quality products that meet specific customer demands.