Designed for small industrial robotic & modelling applications these robust modules boast a powerful high quality five pole motor with sintered bronze bearings & an integral all-metal gearbox with bronze output bearings. The epicyclic planetry gearbox is smaller & lighter than a conventional one & allows the use of a smaller motor because of increased efficiency up to 90. The output shaft is central & 3mm in diameter. Specifications Order RPM at Torque Code 3V6V9V12 Vgf.cm N02BQ350800130018001000N03BQ1850821192000N04BQ51423322500