This 2.13" x 1.45" x 1.45" gearmotor is a powerful brushed DC motor with 50:1 metal gearbox intended for operation at 12 V. These units have a 0.61"-long, 6 mm-diameter D-shaped output shaft.
Key specs at 12 V: 200 RPM and 300 mA free-run, 170 oz-in (12 kg-cm) and 5 A stall.
Gearmotor Dimensions:
The face plate 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. You can use our custom 37D metal gearmotor bracket (shown in the left picture below) to mount the gearmotor to your project via these mounting holes and the screws that come with the bracket.
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Please note that unlike our smaller metal gearmotors, these 37D mm gearmotors have output shafts with a diameter of 6 mm. The Pololu universal aluminum mounting hub for 6mm shafts can be used to mount our larger Pololu wheels (80mm- and 90mm-diameter) or custom wheels and mechanisms to the gearmotor’s output shaft (see the right picture above).
The picture below shows the dimensions (in mm) of the 37D mm line of gearmotors. The value of X is 22 mm for the 19:1 37Dx52L mm and 29:1 37Dx52L mm versions, 24 mm for the 50:1 37Dx54L mm and 67:1 37Dx54L mm versions, and 26.5 mm for the 100:1 37Dx57L mm and 131:1 37Dx57L mm versions.
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| 37D mm metal gearmotor dimensions (units in mm). |
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Warning: Do not screw too far into the mounting holes as the screws can hit the gears. We recommend screwing no further than 3mm (1/8") into the screw hole.
The operational specs listed in the table below were measured at 6 V. At 12 V, the no-load RPM, stall current, and stall torque will all be approximately twice their 6V values. To see the motor specs for 12V operation, please see the short description at the top of this page or this product’s specification tab.
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| 37D mm metal gearmotor next to a micro metal gearmotor for size comparison. |
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Metal Gearmotor Comparison Table
| Gear Ratio | No-Load Speed @ 12 V |
Stall Torque @ 12 V |
Stall Current @ 12 V |
 With Encoder |
 Without Encoder |
|---|---|---|---|---|---|
| 1:1 | 11,000 RPM | 5 oz-in | 5 A | motor without gearbox | |
| 19:1 | 500 RPM | 84 oz-in | 5 A | 37Dx52L mm | 37Dx52L mm |
| 29:1 | 350 RPM | 110 oz-in | 5 A | 37Dx52L mm | 37Dx52L mm |
| 50:1 | 200 RPM | 170 oz-in | 5 A | 37Dx54L mm | 37Dx54L mm |
| 67:1 | 150 RPM | 200 oz-in | 5 A | 37Dx54L mm | 37Dx54L mm |
| 100:1 | 100 RPM | 220 oz-in | 5 A | 37Dx57L mm | 37Dx57L mm |
| 131:1 | 80 RPM | 250 oz-in | 5 A | 37Dx57L mm | 37Dx57L mm |
