This gearmotor consists of a low-power, 6 V brushed DC motor combined with a metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 10,884.47 counts per revolution of the gearbox’s output shaft. 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.

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). The motor and encoder portion is available by itself (no gearbox) for each combination of power level and nominal operating voltage, and versions without the encoder are also available. 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 version that offers the best combination of speed, torque, and current draw for your particular application.

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 1 V); lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

Rated Voltage	Motor Type	Stall Current @ Rated Voltage	No-Load Speed @ Rated Voltage	Approximate Stall Torque @ Rated Voltage	With Encoder	Without Encoder
12 V	medium-power (MP)	2.1 A	7800 RPM	2.7 oz-in	1:1 MP 12V w/encoder
			1700 RPM	11 oz-in	4.4:1 MP 12V w/encoder	4.4:1 MP 12V
			770 RPM	22 oz-in	9.7:1 MP 12V w/encoder	9.7:1 MP 12V
			370 RPM	42 oz-in	20.4:1 MP 12V w/encoder	20.4:1 MP 12V
			220 RPM	63 oz-in	34:1 MP 12V w/encoder	34:1 MP 12V
			160 RPM	85 oz-in	47:1 MP 12V w/encoder	47:1 MP 12V
			100 RPM	125 oz-in	75:1 MP 12V w/encoder	75:1 MP 12V
			76 RPM	165 oz-in	99:1 MP 12V w/encoder	99:1 MP 12V
			43 RPM	250 oz-in	172:1 MP 12V w/encoder	172:1 MP 12V
			33 RPM	320 oz-in	227:1 MP 12V w/encoder	227:1 MP 12V

Documents:

• Dimension Diagram
• 3D model

Package Includes :

• 1 x Pololu 3225 / 3226 / 3227 / 3228 / 3229 / 3230 / 3231 / 3232 / 3233 Metal Gearmotor 25D MP 12V - Without Encoder