HPS90-MB Low-Backlash Precision Planetary Gearbox (≤10 arcmin) for 86mm (NEMA 34) Stepper Motor/BLDC Motor

This HPS90-MB precision planetary gearbox is designed for 86 mm (NEMA 34) stepper and BLDC motors. Featuring a compact inline design with an integrated input shaft coupling, it accepts motors with a Φ14 mm shaft and a maximum shaft length of 40 mm. The gearbox delivers high-precision gearing with ≤10 arcmin backlash (single-stage) and up to 96% efficiency, offering reduction ratios from 4:1 to 70:1 and rated output torque from 39 to 100 N·m. It handles up to 3,000 RPM input speed and loads of 1,000 N radial / 800 N axial, operating at ≤55 dB with IP54 protection, lifetime lubrication, and a 20,000-hour lifespan. Its Φ20 mm keyway output shaft and high torque density make it well suited to heavy-duty precision axes in CNC routers and engravers, laser processing equipment, industrial robotics, automated production lines, packaging machinery, and large-format positioning systems where reliable torque multiplication and repeatable accuracy are critical.

General Specification

• Manufacturer Part Number: HPS90-MB
• Product Type: Precision Planetary Gearbox
• Rated Input Speed: 3,000 RPM
• Max. Input Speed: 3,000 RPM
• Max. Radial Load: 1,000 N
• Max. Axial Load: 800 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: Φ20 mm
• Output Shaft Length: 40 mm
• Input Shaft Diameter: Φ14 mm
• Input Shaft Length: Max. 40 mm