Pololu Micro Metal Gearmotor (6V)

by Pololu

These tiny brushed DC gearmotors are available in a wide range of gear ratios and power ratings and with four different motors: high-power 6 V motors with long-life carbon brushes (HPCB), and high-power (HP), medium power (MP), and low power (LP) 6 V motors with shorter-life precious metal brushes.

The 6 V HPCB and 6 V HP motors are identical except for their brushes, which only affect the lifetime of the motor.

Note that the HPCB terminals are 0.5 mm wider than those on the other micro metal gearmotor versions (2 mm vs. 1.5 mm), and they are about 1 mm closer together (6 mm vs. 7 mm).

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The recommended upper limit for instantaneous torque is 2 kg-cm (25 oz-in) for all the gear ratios; 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 and HPCB) motors; a general recommendation for brushed DC motor operation is 25% or less of the stall current.

Gearmotor Dimensions

In terms of size, these gearmotors are very similar to Sanyo’s popular 12 mm NA4S DC gearmotors, and gearmotors with this form factor are occasionally referred to as N20 motors. The versions with carbon brushes (HPCB) have slightly different terminal and end-cap dimensions than the versions with precious metal brushes, but all of the other dimensions are identical. 

Dimensional drawing

Note: These motors do not come with an extended backshaft and so are not compatible with the optical or magnetic encoders we stock. The HPCB motors also do not fit the push header shims.


Motor Type Stall Current No-Load Current Ratio No-Load Speed (RPM) Extrapolated Stall Torque Max Power (W)
(kg ⋅ cm) (oz ⋅ in)
high-power, carbon brushes (HPCB) 1.5A 0.10A 298:1 110 3.4 47 1.0
150:1 220 2.0 28 1.1
100:1 330 1.6 22 1.3
75:1 430 1.1 15 1.3
50:1 650 0.74 10 1.2
30:1 1100 0.45 6.2 1.2
high-power (HP) 1.6A 0.07A 298:1 100 4.0 56 1.1
75:1 410 1.3 18 1.4
50:1 590 0.86 12 1.3
medium-power (MP) 0.67A 0.04A 298:1 73 2.4 33 0.44
low-power (LP) 0.36A 0.02A 298:1 45 2.0 28 0.22