This gearmotor consists of a low-power, 6 V brushed DC motor combined with a 498.87:1 metal spur gearbox. 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 specs at 6 V: 11 RPM and 250 mA (max) free-run, 400 oz-in (30 kg-cm) and 2.4 A stall.


These cylindrical brushed DC gearmotors are available in a wide range of gear ratios and with five different motors (two power levels of 6 V motors and three power levels of 12 V motors). The gearmotors all have the same 25 mm diameter case and 4 mm diameter gearbox output shaft, so it is generally easy to swap one version for another if your design requirements change (though the length of the gearbox tends to increase with the gear ratio). All versions are also available with an integrated 48 CPR quadrature encoder on the motor shaft. Please see the 25D metal gearmotor comparison table for detailed specifications of all our 25D 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.

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. For these gearboxes, the recommended upper limit for instantaneous torque is 200 oz-in (15 kg-cm); we strongly advise keeping applied loads well under this limit. Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for the versions that use high-power (HP) motors; a general recommendation for brushed DC motor operation is 25% or less of the stall current.

In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

Details for item #1591

Exact gear ratio: 22×22×22×22×22×22×22×2412×10×10×10×10×10×10×10498.87:1


Size: 25D x 58L mm1
Weight: 96 g
Shaft diameter: 4 mm


General specifications

Gear ratio: 498.87:1
No-load speed @ 6V: 11 rpm
No-load current @ 6V: 250 mA2
Stall current @ 6V: 2400 mA
Stall torque @ 6V: 400 oz·in3
Motor type: 2.4A stall @ 6V (LP 6V)
Encoders?: N


Length measurement is from gearbox face plate to back of motor (it does not include the output shaft or motor terminals). See dimension diagram for details.
This is a theoretical value; stalling the gearbox output shaft is likely to damage the gearbox.

1591 - 499:1 Metal Gearmotor 25Dx58L mm LP 6V

  • Brand: Pololu
  • Product Code:ES000272
  • Availability:In Stock
  • 19.95€