Overview
The SITO DRIVE HS-25-III reducer is offered in 30, 50, 80, 100, and 120 transmission-ratio options for robotic systems, including humanoid robots, robotic arms, exoskeletons, quadruped robots, AGV vehicles, and ARU robots. At a 2000 r/min input speed, rated torque varies by selected ratio from 27 to 67 Nm. Select the ratio according to the required torque, allowable load torque, and backlash specification.
Features
- Five transmission-ratio options: 30, 50, 80, 100, and 120.
- Maximum allowable input speed of 5600 rpm for every ratio option.
- Allowable average speed of 3500 rpm for every ratio option.
- Backlash of ≤20 arcsec for ratios 30 and 50; ≤10 arcsec for ratios 80, 100, and 120.
Specifications
| Parameter | Ratio 30 | Ratio 50 | Ratio 80 | Ratio 100 | Ratio 120 |
|---|---|---|---|---|---|
| Model | HS-25-III | HS-25-III | HS-25-III | HS-25-III | HS-25-III |
| Transmission ratio | 30 | 50 | 80 | 100 | 120 |
| Rated torque at 2000 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 | 5600 rpm | 5600 rpm | 5600 rpm | 5600 rpm | 5600 rpm |
| Allowable average speed | 3500 rpm | 3500 rpm | 3500 rpm | 3500 rpm | 3500 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
- Humanoid robots and exoskeletons: select a ratio with the appropriate rated and allowable load torque for the joint or actuator requirement.
- Robotic arms: use the ratio-specific backlash value when positioning precision is a selection consideration.
- Quadruped robots, AGV vehicles, and ARU robots: select from the available ratio options based on the system's required reduction ratio and torque limits.
Downloads
- SITO HS 25 III Reducer — 3D Model (STEP)
- SITO HS 25 III Draw instalation drawing — Installation Drawing (PDF)
Visual Details
Product Video
Specifications and Performance

Additional Product Details


Dimensions and Construction

Application Examples
