250:1 Micro Metal Gearmotor
 

These tiny brushed DC gearmotors are intended for use at 6 V, though in general, these kinds
of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 – 9 V
range (rotation can start at voltages as low as 0.5 V). Lower voltages might not be
practical, and higher voltages could start negatively affecting the life of the motor.
The micro metal gearmotors are available in a wide range of gear ratios—from 5:1 up to 1000:1—and offer a choice
between two different motors: high-power (HP) and standard.
With the exception of the 1000:1 gear ratio versions, all of the micro metal
gearmotors have the same physical dimensions, so one version can be easily swapped for another if your design requirements change.
Please see the micro metal gearmotor comparison table for detailed specifications of all our micro metal gearmotors.
This dynamically-sortable table can help you find the gearmotor that
offers the best blend of speed, torque, and current-draw for your particular application.
A more basic comparison table is available below.

Some versions of the gearmotors are sold with an additional 1mm-diameter output shaft that protrudes
from the rear of the motor. This 4.5mm-long rear shaft rotates at the same speed as the
input to the gearbox and offers a way to add a custom-built encoder to provide motor speed or position feedback.
 

The gearbox has a long (0.365" or 9.27 mm), 3 mm-diameter D-shaped metal output shaft,
and the brass faceplate has two mounting holes threaded for M1.6 screws (1.6 mm diameter, 0.35 mm thread pitch).
It weighs approximately 0.35 oz (10 g). Versions with the extended motor
shaft have a 1mm diameter round shaft that protrudes 4.5 mm from the rear of the motor,
between the two motor terminals; this is not pictured in the above dimension diagram.

The gearbox on the 1000:1 and 1000:1 HP micro metal gearmotors is 12.5 mm long.
All of the other micro metal gearmotors have 9mm-long gearboxes, as shown in the above dimension diagram.

Motor Accessories

• Wheels and Hubs:
  The micro metal gearmotor’s output shaft matches our assortment of Pololu wheels and the
  Solarbotics RW2 rubber wheel.
  You can also use the Pololu universal mounting hub to
  mount custom wheels and mechanism to the micro metal gearmotor’s output shaft.
   

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