488:1 Metal Gearmotor 20Dx46L mm 6V with Extended Motor Shaft

488:1 Metal Gearmotor 20Dx46L mm 6V with Extended Motor Shaft


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 170 mA with no-load, 310 oz-in (23 kg-cm) and 2.9 A at stall.

Note: the gearbox torque limit is 70 oz-in (5 kg-cm)

In Stock

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).

These gearmotors have an additional 2 mm-diameter output shaft that protrudes 6 mm from the rear of the motor. This rear shaft rotates at the same speed as the input to the gearbox and offers a way to add an encoder.


Size: 20D × 46L mm
Weight: 46 g
Shaft diameter: 4 mm

General specifications

Gear ratio: 488.28125:1
No-load speed @ 6V: 30 rpm
No-load current @ 6V: 170 mA
Stall current @ 6V: 2.9 A
Stall torque @ 6V: 310 oz·in
Extended motor shaft?: Y
Motor type: 2.9A stall @ 6V

Specific References

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