This gearmotor is a powerful brushed DC motor with 50:1 metal gearbox intended for operation at 12 V. The gearbox is composed mainly of spur gears, but it features helical gears for the first stage for reduced noise and improved efficiency. These units have a 16 mm-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available with an integrated encoder.

Key specifications:

voltage no-load performance stall extrapolation
12 V 200 RPM, 200 mA 21 kg⋅cm (290 oz⋅in), 5.5 A




Dimensions of the 37D metal gearmotors (without encoders). Units are mm over [inches].


Size: 37D × 54L mm1
Weight: 190 g
Shaft diameter: 6 mm2

General specifications

Gear ratio: 50:1
No-load speed @ 12V: 200 rpm
No-load current @ 12V: 0.2 A
Stall current @ 12V: 5.5 A3
Stall torque @ 12V: 21 kg·cm3
Max output power @ 12V: 10 W
No-load speed @ 6V: 100 rpm4
No-load current @ 6V: 0.15 A4
Stall current @ 6V: 3.0 A4
Stall torque @ 6V: 12 kg·cm4
Motor type: 12V

Performance at maximum efficiency

Max efficiency @ 12V: 51 %
Speed at max efficiency: 180 rpm
Torque at max efficiency: 2.2 kg·cm
Current at max efficiency: 0.66 A
Output power at max efficiency: 4.0 W

General specifications

Encoders?: N


1: 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.
2: D shaft.
3: Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
4: This motor will run at 6 V but is intended for operation at 12 V.

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