NEMA17 HPR42 Series Common Planetary Gearbox For Stepper Motor Reduction Gear Ratio 25:1
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The NEMA17 HPR42 Planetary Gearbox is a high-precision, compact gearbox designed for NEMA17 stepper motors.
Featuring a 25:1 reduction ratio, it delivers enhanced torque output, smooth performance, and precise motion control — perfect for robotics, CNC systems, 3D printers, and industrial automation.
This gearbox is built with hardened steel gears, precision bearings, and integrated input coupling, ensuring low backlash (≤45 arcmin), quiet operation (≤55 dB), and long service life (20,000+ hours).
Its 42 × 42 mm compact design, 8 mm key shaft, and IP54 protection make it ideal for professional-grade motion control setups.
Key Features
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Designed for NEMA17 stepper motors — perfect fit for 42 mm frame size.
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25:1 reduction ratio — boosts torque and precision for demanding applications.
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Rated torque 10 N·m, sudden stop torque 20 N·m.
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Low backlash ≤45 arcmin for high accuracy.
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Quiet operation ≤55 dB for smooth mechanical motion.
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Durable construction with hardened steel gears and bearings.
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Efficiency up to 80%, suitable for high-speed operation.
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Operating temperature range: −20°C to +150°C.
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Long service life exceeding 20,000 hours.
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Compact & reliable design with key shaft output and IP54 rating.
Applications
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Robotics & Automation Equipment
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CNC Machines & Milling Systems
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3D Printers & Prototyping Platforms
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Packaging & Labeling Machines
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Motion Control Systems using NEMA17 Motors
Data Sheet:- Click Here
Specifications
HPR42-L2SW Planetary Gearbox
| Parameter | Specification |
|---|---|
| Gear Ratio Options | 25:1 |
| Gearbox Length (mm) | 87.5 |
| Rated Torque (N·m) | 10 |
| Sudden Stop Torque (N·m) | 20 |
| Backlash (arcmin) | ≤45 |
| Efficiency (%) | 80 |
| Rated Input Speed (rpm) | 1000 |
| Max Input Speed (rpm) | 2000 |
| Axial Force (N) | 100 |
| Radial Force (N) | 300 |
| Noise (dB) | ≤55 |
| Protection Level | IP54 |
| Operating Temp (°C) | −20 ~ +150 |
| Output Shaft Type | Key Shaft |
Physical Specifications
| Parameter | Details |
|---|---|
| Motor Shaft Type | Round Shaft |
| Gearbox Length (mm) | 87.5 |
| Output Shaft Type | Key Shaft |
| Output Shaft Diameter (mm) | 8 |
| Output Shaft Length (mm) | 21.5 |
| Key Length (mm) | 14 |
| Weight (kg) | 0.38 |
Package Includes
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1 × NEMA17 HPR42 Planetary Gearbox (25:1 ratio)