H-D Advanced Manufacturing Co. (H-D) has acquired San Diego, CA-based Sungear Inc., a manufacturer of complex, high-quality, precision gear components for many of the world's aerospace suppliers. The company's loose gearing and gear assembly products perform critical functions in engine starters, auxiliary power units, and other applications. Sungear is the fourth acquisition completed under the H-D platform, joining Overton Chicago Gear Corp., a manufacturer of large, high-precision gears and gearboxes; Innovative Mechanical Solutions (iMECH), a manufacturer of highly engineered, custom bearings for the directional drilling motor industry; and Leading Edge Heat Treating Services Ltd., a provider of heat treating solutions.