Pololu
34:1 Metal Gearmotor 25Dx52L mm HP 12V with 48 CPR Encoder
A high-power 12V brushed DC gearmotor in the Pololu 25D form factor (25mm diameter) with a 34.014:1 metal spur gearbox and an integrated 48 CPR quadrature en...
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A high-power 12V brushed DC gearmotor in the Pololu 25D form factor (25mm diameter) with a 34.014:1 metal spur gearbox and an integrated 48 CPR quadrature encoder. The encoder provides 1632.67 counts per revolution of the gearbox output shaft, enabling precise speed and position control for robotics applications.
The D-shaped output shaft (4mm diameter, 12.5mm long) is compatible with Pololu 25D mounting brackets, wheels, and couplers.
Key Features
- 34.014:1 Metal Gearbox – Durable metal spur gears for reliable operation
- Integrated Quadrature Encoder – 48 CPR on motor shaft (1632.67 CPR at output)
- High-Power Motor – 12V brushed DC with high torque output
- D-Shaped Output Shaft – 4mm diameter, 12.5mm long
- 25D Form Factor – ~25mm diameter cylinder
Specifications
- Gear Ratio – 34.014:1
- Operating Voltage – 12V
- No-Load Speed – 290 RPM @ 12V
- No-Load Current – 300 mA
- Stall Torque – 8.5 kg·cm (120 oz·in)
- Stall Current – 5.6 A
- Encoder Resolution – 48 CPR (motor shaft) / 1632.67 CPR (output shaft)
- Output Shaft – D-shaped, 4mm diameter × 12.5mm long
- Motor Diameter – ~25mm
Ideal For
- Robotics platforms requiring precise speed and position control
- PID-controlled drive systems
- Autonomous vehicles and navigation robots
Package Contents
- 1× 34:1 Metal Gearmotor 25Dx52L mm HP 12V with 48 CPR Encoder
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- encoder
- An encoder is a sensor that converts the rotation or position of a shaft, knob or dial into electrical signals, reporting movement as incremental steps and direction, or as an absolute position. It is used to track how far something has turned, which matters for precise positioning, speed control, repeatable movement, or using a rotary knob as an input.
- 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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Brands
Robotics & Motion
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