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 they are optionally available with an additional 2 mm-diameter output shaft that protrudes 6 mm from the rear of the motor. This optional rear shaft rotates at the same speed as the input to the gearbox and offers a way to add an encoder, such as our magnetic encoder for 20D mm metal gearmotors, to provide motor speed or position feedback.

The gearmotors all have 20 mm-diameter gearboxes and 4 mm-diameter gearbox output shafts, 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). 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
Stall
Current
@ Rated Voltage
No-Load
Speed
@ Rated Voltage
Approximate
Stall Torque
@ Rated Voltage


Single-Shaft
(Gearbox Only)


Dual-Shaft
(Gearbox & Motor)
6 V 3.2 A 560 RPM 30 oz-in 25:1 6V 25:1 6V dual-shaft
450 RPM 35 oz-in 31:1 6V 31:1 6V dual-shaft
225 RPM 60 oz-in 63:1 6V 63:1 6V dual-shaft
180 RPM 75 oz-in 78:1 6V 78:1 6V dual-shaft
140 RPM 90 oz-in 100:1 6V 100:1 6V dual-shaft
110 RPM 100 oz-in 125:1 6V 125:1 6V dual-shaft
90 RPM 115 oz-in 156:1 6V 156:1 6V dual-shaft
70 RPM 125 oz-in 195:1 6V 195:1 6V dual-shaft
55 RPM 140 oz-in 250:1 6V 250:1 6V dual-shaft
45 RPM 150 oz-in 313:1 6V 313:1 6V dual-shaft
35 RPM 160 oz-in 391:1 6V 391:1 6V dual-shaft
29 RPM 170 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. For these gearboxes, the recommended upper limit for instantaneous torque is 125 oz-in (9 kg-cm); we strongly advise keeping applied loads well under this limit. Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes, especially for the versions that use high-power (HP) motors; a general recommendation for brushed DC motor operation is 25% or less of the stall current.

These motors are intended for operation at around 6 V. In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.

Products in category “20D mm Metal Gearmotors”

Pololu item #: 3450
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 25:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 560 RPM and 200 mA free-run, 30 oz-in (2.1 kg-cm) and 3.2 A stall.

Pololu item #: 3462
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 25:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 560 RPM and 200 mA free-run, 30 oz-in (2.5 kg-cm) and 3.2 A stall.

Pololu item #: 3451
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 31.25:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 450 RPM and 200 mA free-run, 35 oz-in (2.5 kg-cm) and 3.2 A stall.

Pololu item #: 3463
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 31.25:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 450 RPM and 200 mA free-run, 35 oz-in (2.5 kg-cm) and 3.2 A stall.

Pololu item #: 3452
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 62.5:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 225 RPM and 200 mA free-run, 60 oz-in (4.3 kg-cm) and 3.2 A stall.

Pololu item #: 3464
Temporarily out of stock. See product page to backorder.
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 62.5:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 225 RPM and 200 mA free-run, 60 oz-in (4.3 kg-cm) and 3.2 A stall.

Pololu item #: 3453
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 78.13:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 180 RPM and 200 mA free-run, 75 oz-in (5.4 kg-cm) and 3.2 A stall.

Pololu item #: 3465
Temporarily out of stock. See product page to backorder.
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 78.13:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 180 RPM and 200 mA free-run, 75 oz-in (5.4 kg-cm) and 3.2 A stall.

Pololu item #: 3454
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 100:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 140 RPM and 200 mA free-run, 90 oz-in (6.5 kg-cm) and 3.2 A stall.

Pololu item #: 3466
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 100:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 140 RPM and 200 mA free-run, 90 oz-in (6.5 kg-cm) and 3.2 A stall.

Pololu item #: 3455
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 125:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 110 RPM and 200 mA free-run, 100 oz-in (7.2 kg-cm) and 3.2 A stall.

Pololu item #: 3467
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 125:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 110 RPM and 200 mA free-run, 100 oz-in (7.2 kg-cm) and 3.2 A stall.

Pololu item #: 3456
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 156.3:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 90 RPM and 200 mA free-run, 110 oz-in (8 kg-cm) and 3.2 A stall.

Pololu item #: 3468
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 156.3:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 90 RPM and 200 mA free-run, 110 oz-in (8 kg-cm) and 3.2 A stall.

Pololu item #: 3457
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 195.3:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 70 RPM and 200 mA free-run, 125 oz-in (9 kg-cm) and 3.2 A stall.

Pololu item #: 3469
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 195.3:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 70 RPM and 200 mA free-run, 125 oz-in (9 kg-cm) and 3.2 A stall.

Pololu item #: 3458
Temporarily out of stock. See product page to backorder.
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 250:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 55 RPM and 200 mA free-run, 140 oz-in (10 kg-cm) and 3.2 A stall.

Pololu item #: 3470
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 250:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 55 RPM and 200 mA free-run, 140 oz-in (10 kg-cm) and 3.2 A stall.

Pololu item #: 3459
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 312.5:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 45 RPM and 200 mA free-run, 150 oz-in (11 kg-cm) and 3.2 A stall.

Pololu item #: 3471
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 312.5:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 45 RPM and 200 mA free-run, 150 oz-in (11 kg-cm) and 3.2 A stall.

Pololu item #: 3460
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These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 390.6:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 35 RPM and 200 mA free-run, 160 oz-in (11.5 kg-cm) and 3.2 A stall.

Pololu item #: 3472
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 390.6:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 35 RPM and 200 mA free-run, 160 oz-in (11.5 kg-cm) and 3.2 A stall.

Pololu item #: 3461
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 488.3:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox.

Key specs at 6 V: 30 RPM and 200 mA free-run, 170 oz-in (12 kg-cm) and 3.2 A stall.

Pololu item #: 3473
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 488.3:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 18 mm from the face plate of the gearbox. This version also has a 6 × 2 mm extended motor shaft.

Key specs at 6 V: 30 RPM and 200 mA free-run, 170 oz-in (12 kg-cm) and 3.2 A stall.

Pololu item #: 1163
Temporarily out of stock. See product page to backorder.
Out of stock.
Quantity:

These small brushed DC gearmotors can deliver a lot of power for their size. This version has a 6V brushed DC motor combined with a 73:1 metal spur gearbox. The gearmotor is cylindrical with a diameter of 20 mm, and the D-shaped output shaft is 4 mm in diameter and extends 10.7 mm from the face plate of the gearbox.

Key specs at 6 V: 180 RPM and 250 mA free-run, 60 oz-in (4.3 kg-cm) and 3.2 A stall.

Note: This gearmotor is being replaced by a new version with a slightly different gear ratio and a longer output shaft (the motor portion is unchanged). This short-shaft version will be discontinued when the remaining stock is gone.

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