Ratio 10:1 Planetary Gearbox for Nema 17 Stepper Motor 42-55mm Backlash 15 arcmin Input Shaft 25.5mm φ5mm Planetary Reducer for 42 Step Motor incl. 4 Screw 2 Plug 1 Key CNC 3D Printer DIY

High-torque 10:1 planetary gearbox for Nema 17 motors used in CNC printers
✔️ Includes 4 screws, 2 plugs, 1 key and mounting hardware

Compact planetary gearbox designed for Nema 17 stepper motors, ideal for CNC machines, robotics, and 3D printers where high torque and precise motion are required.

✅ Ratio 10:1 for torque multiplication and smooth speed control
✅ Nominal output torque 5 Nm; peak 10 Nm
✅ Backlash ≤ 15 arcmin for precise positioning
✅ Input shaft Ø5 mm; length 25.5 mm; Output shaft Ø8 mm; length 21.5 mm
✅ Body length 42-55 mm; weight 235 g; compatible with shaft length 22-25 mm
✅ Efficiency 96%; nominal input speed 3000 RPM; max input speed 6000 RPM
✅ IP54 waterproof; operating temp -20℃ to +150℃; life ~20,000 h

Dimension	Metric	Imperial
Input shaft diameter	5 mm	0.197 in
Input shaft length	25.5 mm	1.00 in
Output shaft diameter	8 mm	0.315 in
Output shaft length	21.5 mm	0.85 in
Body length	42 to 55 mm	1.66 to 2.17 in
Installation hole distance	31 mm	1.22 in

💡 What is a planetary gearbox and why is it used with stepper motors in precision CNC and 3D printer builds?

A planetary gearbox multiplies torque while keeping size tight, giving steady, precise motion. - compact planetary gearbox for stepper motors in CNC and 3D printers - high torque at low speed with low backlash for accurate positioning - durable design for long service life in hobby robotics and automation