This gearmotor consists of a medium-power, 12 V brushed DC motor combined with a 4.4:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 211.2 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. Key specifications: voltage no-load performance stall extrapolation 12 V 1700 RPM, 200 mA 0.8 kg⋅cm (11 oz⋅in), 2.1 A Dimensions The diagram below shows the dimensions of the 25D mm line of gearmotors (units are mm over [inches]). Dimensions of the Pololu 25D mm metal gearmotors with encoders. Units are mm over [inches]. Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no further than 6 mm (0.24″) into the screw hole. Size: 25D x 63L mm1 Weight: 95 g Shaft diameter: 4 mm General specifications Gear ratio: 4.4:1 No-load speed @ 12V: 1700 rpm No-load current @ 12V: 200 mA Stall current @ 12V: 2100 mA Stall torque @ 12V: 11 oz·in No-load speed @ 6V: 850 rpm2 Stall current @ 6V: 1050 mA2 Stall torque @ 6V: 5 oz·in2 Motor type: 2.1A stall @ 12V (MP 12V) Lead length: 8 in3 Encoders?: Y Notes: 1. Length measurement is from gearbox face plate to back of encoder cap (it does not include the output shaft). See dimension diagram for details. 2. This motor will run at 6 V but is intended for operation at 12 V. 3. May vary by a few inches.
