20D mm Metal Gearmotors

20D mm metal gearmotor CB with long-life carbon brushes.

20D mm metal gearmotor CB with long-life carbon brushes and an extended motor shaft.

Magnetic Encoder Kit for 20D mm Metal Gearmotors assembled on a 20D mm metal gearmotor with extended motor shaft.

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). All versions are available with an option extended motor shaft, which allows for the addition of encoders like our magnetic encoder for 20D mm metal gearmotors (as shown in the right picture above).

Please see the 20D metal gearmotor datasheet (1MB pdf) for more information, including detailed performance graphs for each 6V CB and 12V CB version. You can also use our dynamically sortable 20D mm metal gearmotor comparison table for 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:

Alternatives available with variations in these parameter(s): gear ratio motor type extended motor shaft? Select variant…

Rated
Voltage
Brush
Type
Stall
Current
No-Load
Current
No-Load Speed
(RPM)
Extrapolated
Stall Torque
Max Power
(W)


Single-Shaft
(Gearbox Only)


Dual-Shaft
(Gearbox & Motor)
(kg ⋅ cm) (oz ⋅ in)
12 V long-life
carbon
(CB)
1.6 A 0.08 A 550 1.9 26 2.6 25:1 12V CB 25:1 12V CB dual shaft
450 2.4 33 2.8 31:1 12V CB 31:1 12V CB dual shaft
220 4.6 64 2.6 63:1 12V CB 63:1 12V CB dual shaft
180 5.4 75 2.5 78:1 12V CB 78:1 12V CB dual shaft
140 6.1 85 2.2 100:1 12V CB 100:1 12V CB dual shaft
110 7.8 110 2.2 125:1 12V CB 125:1 12V CB dual shaft
89 9.0 130 2.0 156:1 12V CB 156:1 12V CB dual shaft
72 10 140 1.9 195:1 12V CB 195:1 12V CB dual shaft
55 14 190 2.0 250:1 12V CB 250:1 12V CB dual shaft
44 16 220 1.8 313:1 12V CB 313:1 12V CB dual shaft
36 21 290 1.7 391:1 12V CB 391:1 12V CB dual shaft
28 25 350 1.5 488:1 12V CB 488:1 12V CB dual shaft
6 V long-life
carbon
(CB)
2.9 A 0.15 A 570 1.6 22 2.3 25:1 6V CB 25:1 6V CB dual shaft
450 2.0 28 2.3 31:1 6V CB 31:1 6V CB dual shaft
230 4.0 56 2.4 63:1 6V CB 63:1 6V CB dual shaft
180 4.4 61 2.1 78:1 6V CB 78:1 6V CB dual shaft
140 5.4 75 2.0 100:1 6V CB 100:1 6V CB dual shaft
110 6.4 89 1.9 125:1 6V CB 125:1 6V CB dual shaft
91 7.9 110 1.8 156:1 6V CB 156:1 6V CB dual shaft
73 9.4 130 1.7 195:1 6V CB 195:1 6V CB dual shaft
57 12 170 1.8 250:1 6V CB 250:1 6V CB dual shaft
45 13 180 1.6 313:1 6V CB 313:1 6V CB dual shaft
36 16 220 1.4 391:1 6V CB 391:1 6V CB dual shaft
30 21 290 1.3 488:1 6V CB 488:1 6V CB dual shaft
6 V precious
metal
2.9 A 0.15 A 570 1.6 22 2.3 25:1 6V 25:1 6V dual-shaft
450 2.0 28 2.3 31:1 6V 31:1 6V dual-shaft
230 4.0 56 2.4 63:1 6V 63:1 6V dual-shaft
180 4.4 61 2.1 78:1 6V 78:1 6V dual-shaft
140 5.4 75 2.0 100:1 6V 100:1 6V dual-shaft
110 6.4 89 1.9 125:1 6V 125:1 6V dual-shaft
91 7.9 110 1.8 156:1 6V 156:1 6V dual-shaft
73 9.4 130 1.7 195:1 6V 195:1 6V dual-shaft
57 12 170 1.8 250:1 6V 250:1 6V dual-shaft
45 13 180 1.6 313:1 6V 313:1 6V dual-shaft
36 16 220 1.4 391:1 6V 391:1 6V dual-shaft
30 21 290 1.3 488:1 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 5 kg-cm (70 oz-in) for the versions with carbon brushes (12V CB and 6V CB) and under 3.5 kg-cm (50 oz-in) for the versions with precious metal brushes. Stalls can also result in rapid (potentially on the order of seconds) 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 12 V motors with a stall current of 1.6 A and a typical free-run current of 80 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, but with half the current draw.

These 20D gearmotors have 6 V motors with a stall current of 2.9 A and a typical free-run current of 150 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 6 V motors with a stall current of 2.9 A and a typical free-run current of 150 mA. They use the same motor windings as our 6V CB versions, but they feature shorter-life precious metal brushes instead of carbon brushes.


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