RS550 28,000 RPM Motor – Breathe new life into your power tools or kickstart your next build
Has your drill given up mid-project? Or perhaps you are starting a custom build from scratch and need a motor that won’t buckle under load. The RS550 18V–21V DC motor delivers a powerful 28,000 RPM, 90W of output power, and 1Nm of torque—specs designed to handle everything from heavy-duty screwdriving and drilling to robotics and automation projects.
Note: The motor is supplied with the pre-fitted gear only; no additional accessories are included. Please verify dimensional compatibility (3.2mm shaft diameter, 25mm mounting hole spacing) before purchase.
Why choose the RS550 Motor? (Key Benefits):
- 28,000 RPM (no-load) — High-speed performance that maintains momentum during repetitive tasks without stalling.
- 90W Power & 1Nm Torque — Robust enough for M4–M6 metric screws in steel and drilling through wood or composite materials without jamming.
- 18V–21V DC Compatibility — Designed to work seamlessly with standard Li-Ion battery platforms from most major power tool brands without needing modifications.
- 12-Tooth Gear Included — Ready for immediate installation; no need to source extra parts.
- Standard RS550 Dimensions — 37.2mm diameter, 74.8mm length, 3.2mm shaft, and 25mm mounting hole spacing ensure a perfect fit for direct replacements.
- Permanent Magnet & 12-Tooth Rotor — Provides a stable magnetic field, reduced vibration, and longer brush life compared to standard rotors.
Performance and Specifications
The RS550 is a staple in the industry, renowned for its exceptional power-to-size ratio. Its permanent magnet stator ensures a consistent magnetic field, meaning your speed remains steady even when the load increases.
The 3.2mm diameter shaft (12mm length) comes pre-fitted with a 12-tooth gear (8.6mm diameter, 6.5mm thickness), though it is compatible with any standard pinion gear of the same bore size. With 25mm spacing between mounting holes, it adheres to the universal RS550 standard, making it a drop-in replacement for most cordless drills and electric screwdrivers.
Whether you are working on robotics, automation, or RC vehicles, its compact footprint and 90W output make it a field-tested, reliable choice.
| Feature | Specification |
|---|---|
| Motor Length | 74.8 mm |
| Motor Diameter | 37.2 mm |
| Shaft Length | 12 mm |
| Shaft Diameter | 3.2 mm |
| Gear Diameter | 8.6 mm |
| Gear Thickness | 6.5 mm |
| Mounting Hole Spacing | 25 mm |
| Max Speed (No-load) | 28,000 RPM |
| Output Power | 90 W |
| Torque | 1 Nm |
| Motor Type | DC, Brushed, Permanent Magnet, 12-tooth |
| Operating Voltage | 18V – 21V DC |
| Main Applications | Cordless drills, electric screwdrivers, robotics, DIY |
What’s in the Box
- 1 x RS550 DC Electric Motor with 12-tooth gear
Frequently Asked Questions
Is this compatible with major 18V–20V power tool brands?
Yes. The 18V–21V DC operating range is perfectly suited for the 18V and 20V Li-Ion platforms used by most popular DIY and professional power tool brands. No electrical modifications are required.
Can I use the RS550 in robotics or RC projects?
Absolutely. It is a popular choice for these applications due to its standardized dimensions and impressive 90W power output. It also performs reliably in light industrial automation.
What driver or ESC do I need for robotics?
You will need a PWM DC motor driver capable of handling up to 21V and a peak current of at least 10A. For power tool repairs, it connects directly to the tool’s original power circuit.
Can I replace the included gear?
Yes. The 3.2mm bore is a standard size for the RS540/550 motor family, making it easy to source alternative pinions if required. The included 12-tooth gear is ready for immediate use.
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