1000:1 Micro Metal Gearmotor HPCB 12V with Extended Motor Shaft

Pololu item #: 3057
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant

Price break Unit price (US$)
1 31.95
5 29.39
25 27.04
100 24.88

backorders allowed

This is a miniature brushed DC metal gearmotor with a gearbox cross section of 10×12 mm and a 9 mm long, 3 mm diameter D-shaped gearbox output shaft.

motor/brush type gearbox encoder
HPCB 12V: high-power 12V with carbon brushes 986.41:1 with brass plates encoder-compatible (extended motor shaft)

voltage no-load performance stall extrapolation*
12 V 35 RPM, 80 mA 10 kg⋅cm (138 oz⋅in), 0.75 A
* Note: Stall torque and stall current specifications are theoretical values; stalls could damage the motor or gearbox.

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

 Description Specs (19) Pictures (17) Resources (3) FAQs (0) On the blog (0) 


Size: 10 × 12 × 28.5 mm1
Weight: 10.5 g
Shaft diameter: 3 mm2

General specifications

Gear ratio: 986.41:1
No-load speed @ 12V: 35 rpm3
No-load current @ 12V: 0.08 A4
Stall current @ 12V: 0.75 A5
Stall torque @ 12V: 10 kg·cm5
No-load speed @ 6V: 18 rpm6
Stall current @ 6V: 0.38 A6
Stall torque @ 6V: 5.0 kg·cm6
Encoder: encoder-compatible (extended motor shaft)
Long-life carbon brushes?: Y
Motor type: 0.75A stall @ 12V (HPCB 12V - carbon brush)

Performance at maximum efficiency

Max efficiency @ 12V: 25 %
Speed at max efficiency: 27 rpm
Torque at max efficiency: 2.1 kg·cm
Current at max efficiency: 0.19 A
Output power at max efficiency: 0.59 W


Output shafts add 15 mm to the 29.5 mm length. See dimension diagram for details.
D shaft.
Typical; ±20%.
Typical, ±50%; no-load current depends on internal friction, which is affected by many factors, including ambient temperature and duration of motor operation.
This is a theoretical value; stalling the gearbox output shaft could damage the gearbox.
This motor will run at 6 V but is intended for operation at 12 V.

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