Metal Gearmotor 25D x 54L mm HP 99:1

Robots and Electronics > Mechanical Components > Gearboxed Motors

item no. POL1576

In Stock
Price: €20.80		add to cart

This cylindrical, gearmotor uses a motor with extra-strong magnets and a 99:1 metal gearbox to deliver a lot of power in a relatively small package. These units have a 8 mm-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V:
100 RPM and 450 mA free-run, 11.5 kg-cm and 6 A stall.

Note: At some of the higher gear ratios, these motors can generate enough torque to damage themselves. Any torque greater than about 18 kg-cm is likely to damage the gearbox, so we recommend that you avoid stalling.

These motors are intended for use at 6 V. 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, though they can begin rotating at voltages as low as 1 V. Higher voltages could start negatively affecting the life of the motor.

Specifications:

Size: 25D x 54L mm

Weight: 91 grams

Shaft diameter: 4 mm

Gear ratio: 99:1

Free-run speed @ 6V: 100 rpm

Free-run current @ 6V: 450 mA

Stall current @ 6V: 6000 mA

Stall torque @ 6V: 11.5 kg-cm

Gearmotor Dimensions

These gearmotors have output shafts with a diameter of 4 mm. The Pololu universal aluminum mounting hub for 4mm shafts 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 (see the left picture below). These are the same type of motors used in the Wild Thumper all-terrain chassis, and the gearbox’s output shaft works directly with the 120mm-diameter Wild Thumper wheels.

Pololu 60×8mm wheel on a Pololu 25D mm metal gearmotor.

The face plate has two mounting holes threaded for M3 screws. You can use our custom-designed 25D mm metal gearmotor bracket (shown in the picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.

Pololu 25D mm gearmotor with bracket.

The diagram below shows the dimensions (in mm) of the 25D mm line of gearmotors. The value of L is shown in the table below.

Dimension diagram (in mm) for the 25D mm metal gearmotors.

Gear Ratio	L (mm)
4.4:1 9.7:1	17
20.4:1	19
34.1 47:1	21
75:1 99:1	23
172:1 227:1	25
378:1 499:1	27