Pololu 12V High-Power 99:1 25D Metal Gearmotor

PololuSKU: POL-3207
Sale price £27.90
incl. VAT
excl. VAT
Only 20 units left

Awesome Extras

PololuPololu 25D Metal Gearmotor Bracket Pair
Sale price £7.60 incl. VAT excl. VAT

This Pololu 25D gearmotor consists of a high-power, 12V brushed DC motor combined with a 99:1 (98.78:1) metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25mm, and the D-shaped output shaft is 4mm in diameter and extends 12.5mm from the faceplate of the gearbox.

In general, these kinds of motors can run at voltages above and below their nominal voltages (they can begin rotating at voltages as low as 1V); lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. This motor will run at 6V but is intended for operation at 12V.

We also stock low-power and medium-power versions of this motor. You can find our entire range of motors here.

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The listed stall torques and currents are theoretical extrapolations; units will typically stall well before these points as the motors heat up. The recommended upper limit for continuously applied loads is 4 kg⋅cm (55 oz⋅in), and the recommended upper limit for intermittently permissible torque is 8 kg⋅cm (110 oz⋅in). Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes; a general recommendation for brushed DC motor operation is 25% or less of the stall current.


Voltage 12V
Version High Power
Gear ratio 98.78:1
No-load speed @ 12V 100 rpm
No-load current @ 12V 0.25A
Stall current @ 12V 5.0A
Stall torque @ 12V 29 kg·cm
No-load speed @ 6V 50 rpm
Stall current @ 6V 2.5A
Stall torque @ 6V 15 kg·cm
Motor type 12V, 5.0A stall (HP 12V)
Size 25D x 54L mm
Weight 91 g
Shaft diameter 4mm

Performance at Maximum Efficiency

Max efficiency @ 12V 36%
Speed at max efficiency 87 rpm
Torque at max efficiency 4.5 kg·cm
Current at max efficiency 0.94A
Output power at max efficiency 4.0W



The downloadable diagram shows the dimensions of the 25D line of metal gearmotors (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 more than 6mm into the screw holes.

Gearmotor accessories

  • Gearmotor Face Plate - The gearmotor face plate has two mounting holes threaded for M3 screws. You can use our custom-designed 25D metal gearmotor bracket to mount the gearmotor to your project via the mounting holes and the screws that come with the bracket.
  • Universal Mounting Hubs - The 4mm diameter gearbox output shaft works with Pololu multi-hub wheels. That shaft also works with the Pololu universal aluminum mounting hub for 4mm shafts, which can be used to mount our larger Pololu wheels (60mm-, 70mm-, 80mm-, and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft.
  • Scooter Wheel Adapters -  You can use our 4mm scooter wheel adapters to mount many common skateboard, inline skate or scooter wheels to the gearmotor’s output shaft.
  • 12mm Hex Wheel Adapters - For a general-purpose hex adapter, consider our 12mm hex wheel adapters which lets you use this motor with many common hobby RC wheels.
  • Wild Thumper Wheels - These motors also work with the hex adapters included with the 120mm-diameter Wild Thumper wheels

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