The S4Q11B280-L27 is part of our line of 4mm diameter DC micro-motors that use of precious metal brush contacts. This model it the largest 4mm we manufacture and produces the most torque. With a stall torque of 0.48 g.cm and a no load speed of 28330 RPM, this motor is suited for such applications as micro-drones and locking mechanisms. Custom lead lengths and RPM speeds are available.