HPR42 Low-Backlash Precision Planetary Gearbox (≤15 arcmin) for 42mm (NEMA 17) Stepper Motor/BLDC Motor

This HPS42 low-backlash precision planetary gearbox is engineered for 42 mm (NEMA 17) stepper, brushless DC, and equal motors, featuring a space-saving inline design with a built-in input shaft coupling. It delivers high-precision gearing with ≤15 arcmin backlash (single-stage) and ≤20 arcmin (two-stage), offering reduction ratios from 3:1 to 100:1, rated output torque of 5–12 N·m, and transmission efficiency of 94%–96%. The gearbox handles a rated input speed of 3,000 RPM (max 6,000 RPM) and loads of 300 N radial / 100 N axial, with an Φ5 mm input bore, a Φ8 mm keyway output shaft, and IP54 protection rated for a 20,000-hour service life across -20°C to +150°C. Its compact 42 mm square flange and low-backlash gearing make it well suited to precision motion axes in CNC routers and engravers, laser processing equipment, automated pick-and-place systems, packaging machinery, and industrial robotics requiring accurate, repeatable torque multiplication from a size 42mm NEMA 17 platform.

General Specification

• Manufacturer Part Number: HPR42
• Product Type: Precision Planetary Gearbox
• Rated Input Speed: 3,000 RPM
• Max. Input Speed: 6,000 RPM
• Max. Radial Load: 300 N
• Max. Axial Load: 100 N
• Noise: ≤55 dB
• Protection Class: IP54
• Lifespan: 20,000 Hours
• Ambient Temperature: -20° to +150°
• Lubrication Type: Lifetime Lubrication
• Output Shaft Type: Keyway
• Output Shaft Diameter: Φ8 mm
• Output Shaft Length: 21.5 mm
• Input Shaft Diameter: Φ5 mm
• Input Shaft Length: Max. 24 mm