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12V Metal Gearmotor 37D Range (With and Without 64 CPR Encoder)

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12V Metal Gearmotor 37D Range (With and Without 64 CPR Encoder) (Helical Pinion)

These brushed DC Metal Gearmotors are the most powerful and largest you will find on our site. Coming in at a whopping 37mm (1.46″) in diameter, they are available in a variety of gear ratios from 6.3:1 to 150:1 at 12V.  Composed mostly of spur gears, however, the first stage features helical gears for improved efficiency and reduced noise. These motors will run at voltages above and below the rated voltage; lower voltages might not be practical in your project, and higher voltages could start reducing the lifespan of the motor.

You can also use our  37D Gearmotor comparison table to search for the version that offers the best combination of speed, torque, and current draw for your particular application:








Gear Ratio


No-Load Speed


Stall Torque


Max Power

Metal Gearmotor 37D 12V helical pinion

Without Encoder

37D Metal Gearmotor 12V with Encoder

With Encoder

(kg ⋅ cm) (oz ⋅ in)
12 V 5.5 A 0.2 A 1:1 (no gearbox) 10,000 0.5 7 P/N #4750
6.3:1 1600 3.0 42 12 P/N #4747 P/N #4757
10:1 1000 4.9 68 12 P/N #4748 P/N #4758
19:1 530 8.5 120 12 P/N #4741 P/N #4751
30:1 330 14 190 12 P/N #4742 P/N #4752
50:1 200 21 290 10 P/N #4743 P/N #4753
70:1 150 27 380 10* P/N #4744 P/N #4754
100:1 100 34 470 8* P/N #4745 P/N #4754
131:1 76 45 630 6* P/N #4746 P/N #4754
150:1 67 49 680 6* P/N #2829 P/N #2828

* Output power for these units is constrained by gearbox load limits; spec provided is output power at max recommended load of 10 kg⋅cm.

Metal Gearmotor accessories

The faceplate has six mounting holes evenly spaced around the outer edge threaded for M3 screws. These mounting holes form a regular hexagon and the centers of neighboring holes are 15.5 mm apart. We carry a bracket for these Gearmotors: a stamped aluminum L-bracket (sold in pairs).

For something a little sturdier than the Stamped bracket. These Machined Aluminum Brackets for 37D Metal Gearmotors allow you to mount and fix your Gearmotor to a surface or project! The brackets have been designed so the six mounting holes of the 37D Gear motor line up exactly with the holes of the brackets, coupled with three tapped M3 holes on the bottom of the bracket for mounting.

The 6 mm diameter gearbox output shaft works with the Pololu universal aluminum mounting hub for 6mm shafts, which can be used to mount our larger Pololu wheels (80mm- and 90mm-diameter) or custom wheels and mechanisms to the gear motor’s output shaft using any compatible wheel adapter!

37D Metal Gearmotor Documents

Datasheet for Pololu 37D Metal Gearmotors (2MB pdf)
Dimension diagrams of the Pololu 37D mm Metal Gearmotors (459k pdf)
3D models of 37D mm gearmotors (7MB zip)
This file contains 3D models (in the step file format) of the 37D mm gear motors with and without encoders.


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