Overview
The SITO DRIVE HS-25-II reducer is available in 30, 50, 80, 100, and 120 speed-ratio options for robotic motion-system applications. At a 2,000 r/min input, rated torque ranges from 27 to 67 Nm by ratio, while allowable average input speed is 3,500 rpm and maximum allowable input speed is 5,600 rpm. Select the ratio according to the required torque and backlash specification.
Features
- Five selectable transmission ratios: 30, 50, 80, 100, and 120.
- Rated torque at 2,000 r/min input ranges from 27 Nm to 67 Nm, depending on ratio.
- Backlash is ≤20 arcsec for 30 and 50 ratios, and ≤10 arcsec for 80, 100, and 120 ratios.
- Maximum allowable input speed is 5,600 rpm and allowable average speed is 3,500 rpm for all listed ratios.
Product Videos
Specifications
| Parameter | Ratio 30 | Ratio 50 | Ratio 80 | Ratio 100 | Ratio 120 |
|---|---|---|---|---|---|
| Model | HS-25-II | HS-25-II | HS-25-II | HS-25-II | HS-25-II |
| Transmission ratio | 30 | 50 | 80 | 100 | 120 |
| Rated torque at 2,000 r/min input | 27 Nm | 39 Nm | 63 Nm | 67 Nm | 67 Nm |
| Peak torque allowed during start/stop | 50 Nm | 98 Nm | 137 Nm | 157 Nm | 167 Nm |
| Maximum allowable average load torque | 38 Nm | 55 Nm | 87 Nm | 108 Nm | 108 Nm |
| Instantaneous maximum torque | 95 Nm | 186 Nm | 255 Nm | 284 Nm | 304 Nm |
| Maximum allowable input speed | 5,600 rpm | 5,600 rpm | 5,600 rpm | 5,600 rpm | 5,600 rpm |
| Allowable average speed | 3,500 rpm | 3,500 rpm | 3,500 rpm | 3,500 rpm | 3,500 rpm |
| Moment of inertia | 0.413 (×10⁻⁴ kg·m²) | 0.413 (×10⁻⁴ kg·m²) | 0.413 (×10⁻⁴ kg·m²) | 0.413 (×10⁻⁴ kg·m²) | 0.413 (×10⁻⁴ kg·m²) |
| Backlash | ≤20 arcsec | ≤20 arcsec | ≤10 arcsec | ≤10 arcsec | ≤10 arcsec |
Applications
Supported application scenarios include humanoid robots, robotic arms, exoskeletons, quadruped robots, AGV vehicles, and ARU robots. The selectable transmission ratios and corresponding torque values help match the HS-25-II to the motion requirements of the selected application.
Downloads
SITO HS 25 II Reducer — 3D Model (STEP)
SITO HS 25 II Draw instalation drawing — Installation Drawing (PDF)
Visual Details
Product Video
Additional Product Details



Application Examples

