4mm Shaft Gearmotors

These 25 mm-diameter (0.98″) gearmotors, spanning a range of gear ratios from 4.4:1 to 499:1, offer a good combination of power and compactness. We have high- and low-current versions to choose from, and integrated 48 CPR encoders are available with selected gear ratios.


Pololu item #: 1162
Price: $19.95
Quantity:

This 1.46" x 0.79" x 0.79" gearmotor is a brushed DC motor with 29:1 metal gearbox that has the power to deliver both speed and torque. These units have a 0.276"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is a replacement for the now-discontinued 25:1 version.

Key specs at 6 V: 440 RPM and 250 mA free-run, 25 oz-in (1.8 kg-cm) and 3.3 A stall.

Pololu item #: 1163
Price: $19.95
Quantity:

This 1.67" x 0.79" x 0.79" gearmotor is a brushed DC motor with 73:1 metal gearbox that has the power to deliver both speed and torque. These units have a 0.276"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is a replacement for the now-discontinued 67:1 version.

Key specs at 6 V: 180 RPM and 250 mA free-run, 60 oz-in (4.3 kg-cm) and 3.3 A stall.

Pololu item #: 1109
Price: $19.95
Quantity:

This 1.72" x 0.79" x 0.79" gearmotor is a brushed DC motor with 154:1 metal gearbox that has the power to deliver both speed and torque. These units have a 0.276"-long, 4 mm-diameter D-shaped output shaft.

Key specs at 6 V: 90 RPM and 250 mA free-run, 120 oz-in (8.6 kg-cm) and 3.3 A stall.