120:1 Plastic Gearmotor Offset Output





This 120:1 gearbox with brushed DC motor has a low-current motor and provides power and speed that is comparable to an RC servo at a fraction of the cost. At 6 V, it has a free-run speed of 85 RPM and a stall torque of approximately 75 oz-in. Though the product picture shows two gearmotors, this product is for a single motor.

This 120:1 plastic gearmotor (gearbox with brushed DC motor) is a great low-cost alternative to modified hobby servos or Tamiya gearboxes. The low-current motor is a perfect match for our qik 2s9v1 dual serial motor controller or micro dual serial motor controller, and the compact size makes this unit an attractive choice for small robot designs. The recommended operating voltage range for this motor is 3 – 12 V.

This is a lower-torque, higher-speed version of the 228:1 plastic gearmotor offset output. At 6 V, the gearbox and motor provide approximately 75 oz-in of torque and 85 RPM. The free-running current is 70 mA, and the stall current is 800 mA. The gearbox is protected by a built-in safety clutch that will typically slip before gear teeth can shear.

This gearmotor comes pre-assembled, with the gears fully enclosed. There are built-in mounting holes, and the output shaft is 6 mm long and 7 mm in diameter with two sides flattened. The output shaft is along the same axis as the motor shaft, but offset; we also sell a version of this gearmotor with a 90° output shaft.

A custom-molded GMPW plastic wheel for this gearmotor is available in a variety of colors.

120:1 Plastic Gearmotor Offset Output Specifications


Size:     42 x 22.7 x 47.8 mm1
Weight:     33 g
Shaft diameter:     7 mm

General specifications

Typical operating voltage:     6 V
Gear ratio:     120:1
Free-run speed @ 6V:     85 rpm
Free-run current @ 6V:     70 mA
Stall current @ 6V:     800 mA
Stall torque @ 6V:     75 oz·in


1    See drawing for detailed dimensions.