Source Engineering has addressed the concern of OEMs who require large volumes of high quality, low cost DC motors. The extensive selection of DC permanent magnet motors range in size from a 2.5 VDC motor to a 24 VDC motor. Speeds of these DC motors range from 550 rpm no load (450 rpm at maximum efficiency) to 28,000 rpm no load (23,655 rpm at maximum efficiency). Model sizes range from 15.5 x 12 mm metal brush permanent magnet DC motors up to 80 mm carbon brush DC motors. The torque range of these DC motors is from 2.1 g/cm to 700 Nm. Most are available with a single shaft or double shafts. Shaft lengths can be specified and are available with or without flats, keyways, and pinions.