Pololu
99:1 Metal Gearmotor 25Dx54L mm LP 6V
A low-power 6V brushed DC gearmotor with a 98.78:1 metal spur gearbox. The cylindrical motor body measures just under 25mm in diameter, and the D-shaped outp...
A low-power 6V brushed DC gearmotor with a 98.78:1 metal spur gearbox. The cylindrical motor body measures just under 25mm in diameter, and the D-shaped output shaft is 4mm in diameter, extending 12.5mm from the gearbox face plate. The low-power variant draws less current than the HP version, making it suitable for battery-powered applications. Also available with an integrated encoder for closed-loop control.
Specifications
- Gear Ratio – 98.78:1
- Voltage – 6V
- No-Load Speed – 61 RPM
- No-Load Current – 100mA
- Stall Torque – 9.1 kg·cm (130 oz·in)
- Stall Current – 2.0A
- Motor Diameter – ~25mm
- Output Shaft – 4mm D-shaped, 12.5mm length
- Gearbox – Metal spur gears
- Dimensions – 25D × 54L mm
Also Available
- 99:1 Metal Gearmotor 25D×54L HP 6V – High-power variant with more torque and speed
- 99:1 Metal Gearmotor 25D×54L MP 12V with Encoder – Medium-power 12V with integrated encoder
Ideal For
- Battery-powered robotics
- Low-current motorised mechanisms
- Projects requiring moderate torque with lower power draw
Package Contents
- 1× 99:1 Metal Gearmotor 25D×54L mm LP 6V
Jargon buster
Plain-language definitions for the technical terms used above.
- closed-loop control
- Closed-loop control means the system uses feedback, such as motor position or speed, to adjust its output automatically. This matters because it can keep a motor moving accurately even when the load changes, unlike simple open-loop control.
- encoder
- A device attached to a motor or shaft that reports movement, such as rotation steps or position. In a pump system, an encoder can help measure or control how much the motor has turned, which affects how repeatable the watering amount can be.
- 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.
- 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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Brands
Robotics & Motion
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