20D mm Metal Gearmotors

These cylindrical brushed DC gearmotors are available in a wide range of gear ratios, from 25:1 up to 488:1, and with three different motors: 6 V and 12 V motors with long-life carbon brushes (CB), and a 6 V motor with shorter-life precious metal brushes. All three motors offer similar performances at their respective nominal voltages, just with the 12 V motor drawing approximately half the current of the 6 V motor and with the carbon brush versions having longer lifetimes than the one with precious metal brushes. The gearmotors all have the same 20 mm diameter body 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). Some versions are also available with an option extended motor shaft, which allows for the addition of encoders like our magnetic encoder for 20D mm metal gearmotors (all versions will be available with this rear-shaft option soon).

Select options:

Please see the 20D mm metal gearmotor comparison table for detailed specifications of all our 20D mm metal gearmotors. This dynamically-sortable table can help you find the gearmotor that offers the best blend of speed, torque, and current-draw for your particular application. A more basic comparison table is available below:

Rated
Voltage
Brush Type Stall
Current
@ Rated Voltage
No-Load
Speed
@ Rated Voltage
Approximate
Stall Torque
@ Rated Voltage


Single-Shaft
(Gearbox Only)


Dual-Shaft
(Gearbox & Motor)
12 V long-life
carbon
(CB)
1.6 A 570 RPM 26 oz-in 25:1 12V CB
450 RPM 33 oz-in 31:1 12V CB
225 RPM 58 oz-in 63:1 12V CB
180 RPM 75 oz-in 78:1 12V CB
140 RPM 85 oz-in 100:1 12V CB
110 RPM 110 oz-in 125:1 12V CB
90 RPM 130 oz-in 156:1 12V CB
72 RPM 160 oz-in 195:1 12V CB
57 RPM 200 oz-in 250:1 12V CB
45 RPM 250 oz-in 313:1 12V CB
36 RPM 290 oz-in 391:1 12V CB
29 RPM 350 oz-in 488:1 12V CB
6 V long-life
carbon
(CB)
2.9 A 590 RPM 22 oz-in 25:1 6V CB
470 RPM 28 oz-in 31:1 6V CB
230 RPM 54 oz-in 63:1 6V CB
190 RPM 62 oz-in 78:1 6V CB
150 RPM 72 oz-in 100:1 6V CB
120 RPM 87 oz-in 125:1 6V CB
93 RPM 110 oz-in 156:1 6V CB
75 RPM 130 oz-in 195:1 6V CB
60 RPM 170 oz-in 250:1 6V CB
46 RPM 220 oz-in 313:1 6V CB
37 RPM 260 oz-in 391:1 6V CB
30 RPM 310 oz-in 488:1 6V CB
6 V precious
metal
2.9 A 590 RPM 22 oz-in 25:1 6V 25:1 6V dual-shaft
470 RPM 28 oz-in 31:1 6V 31:1 6V dual-shaft
230 RPM 54 oz-in 63:1 6V 63:1 6V dual-shaft
190 RPM 62 oz-in 78:1 6V 78:1 6V dual-shaft
150 RPM 72 oz-in 100:1 6V 100:1 6V dual-shaft
120 RPM 87 oz-in 125:1 6V 125:1 6V dual-shaft
93 RPM 110 oz-in 156:1 6V 156:1 6V dual-shaft
75 RPM 130 oz-in 195:1 6V 195:1 6V dual-shaft
60 RPM 170 oz-in 250:1 6V 250:1 6V dual-shaft
46 RPM 220 oz-in 313:1 6V 313:1 6V dual-shaft
37 RPM 260 oz-in 391:1 6V 391:1 6V dual-shaft
30 RPM 310 oz-in 488:1 6V 488:1 6V dual-shaft

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 50 oz-in (3.5 kg*cm) for the versions with precious metal brushes and under 70 oz-in (5 kg-cm) for the versions with carbon brushes (the ones with “CB” in the name). Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for motors like this that can deliver a lot of power for their size; a general recommendation for brushed DC motors is to limit continuous current to approximately 25% of the stall current.

Subcategories

These 20D gearmotors have 6 V motors with a stall current of 2.9 A and a typical free-run current of 170 mA. They use the same motor windings as our 6V CB versions, but they feature shorter-life precious metal brushes instead of carbon brushes.

These 20D gearmotors have 6 V motors with a stall current of 2.9 A and a typical free-run current of 170 mA. They use the same motor windings as our other 6V versions, but they feature long-life carbon brushes instead of precious metal brushes.

These 20D gearmotors have 12 V motors with a stall current of 1.6 A and a typical free-run current of 90 mA. They feature long-life carbon brushes and offer approximately the same performance at 12 V as the 6V CB versions offer at 6 V, just with half the current draw.


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