Pololu
120:1 Mini Plastic Gearmotor, Offset 3mm D-Shaft Output
$8.01
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Only 1 left
A compact, inexpensive brushed DC motor with a 120:1 plastic reduction gearbox, well suited for small robot builds. The motor is rated for 4.5V but runs comf...
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A compact, inexpensive brushed DC motor with a 120:1 plastic reduction gearbox, well suited for small robot builds. The motor is rated for 4.5V but runs comfortably in the 3–6V range. The gearbox output shaft is a 3mm D-shape, offset from and parallel to the motor shaft. A built-in safety clutch protects the gears from excessive loads.
Key Features
- 120:1 Gear Ratio – Good balance of speed and torque for small robots
- 3mm D-Shaft Output – Offset from the motor shaft, 9.7mm long
- 3–6V Operating Range – Rated for 4.5V, flexible voltage range
- Built-In Safety Clutch – Protects gears from stalling damage
- Compact Size – Small enough for mini robot chassis
Specifications (at 4.5V)
- No-Load Speed – 120 RPM
- No-Load Current – 80mA
- Stall Torque – 1.4 kg·cm (20 oz·in)
- Stall Current – 800mA
- Operating Voltage – 3–6V (rated 4.5V)
- Gear Ratio – 120:1
- Output Shaft – 3mm D-shape, 9.7mm long, offset
Ideal For
- Small robot drives and mini rovers
- Lightweight wheeled platforms
- Educational robotics projects
- Battery-powered mechanical projects
Package Contents
- 1× 120:1 mini plastic gearmotor
Jargon buster
Plain-language definitions for the technical terms used above.
- kg·cm
- A torque unit often used for hobby servos, meaning how many kilograms of force the servo can hold at a 1 cm arm length. A higher kg·cm rating means the servo can move or hold heavier loads, but power supply current needs may also increase.
- Stall torque
- The maximum twisting force a servo can produce when its output is held still and cannot move. It helps you judge whether the servo is strong enough for a robot joint, steering linkage, or other load.
- Torque
- A twisting force that causes something to rotate, usually measured in newton-metres or kilogram-centimetres. It matters when choosing motors, servos, gears, and tools because higher torque is needed to lift heavier loads, turn larger wheels, or move mechanisms without stalling.
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Robotics & Motion
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