99:1 Metal Gearmotor 25Dx69L mm LP 6V with 48 CPR Encoder

Pololu item #: 4827
Brand: Pololu supply outlook
Status: Active and Preferred 
RoHS 3 compliant

Price break Unit price (US$)
1 45.95
5 42.27
25 38.89
100 35.78

backorders allowed

This gearmotor consists of a low-power, 6 V brushed DC motor combined with a 98.78:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 4741.44 counts per revolution of the gearbox’s output shaft. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox. This gearmotor is also available without an encoder.

Key specifications:

voltage no-load performance stall extrapolation
6 V 61 RPM, 120 mA 9.1 kg⋅cm (130 oz⋅in), 2.0 A

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

 Description Specs (17) Pictures (11) Resources (4) FAQs (1) On the blog (0) 


Size: 25D x 69L mm1
Weight: 104 g
Shaft diameter: 4 mm2

General specifications

Gear ratio: 98.78:1
No-load speed @ 6V: 61 rpm3
No-load current @ 6V: 0.12 A4
Stall current @ 6V: 2.0 A5
Stall torque @ 6V: 9.1 kg·cm5
Max output power @ 6V: 1.4 W
Motor type: 6V, 2.0A stall (LP 6V)

Performance at maximum efficiency

Max efficiency @ 6V: 34 %
Speed at max efficiency: 50 rpm
Torque at max efficiency: 1.4 kg·cm
Current at max efficiency: 0.36 A
Output power at max efficiency: 0.73 W

General specifications

Lead length: 8 in6
Encoders?: Y


Length measurement is from gearbox face plate to back of encoder cap (it does not include the output shaft). 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.
Stalling is likely to damage the gearmotor. Stall parameters come from a theoretical extrapolation of performance at loads far from stall. As the motor heats up, as happens as it approaches an actual stall, the stall torque and current decrease.
May vary by a few inches.

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