The SARF Series Hollow Output Shaft Combined Helical Worm Gearbox is designed for industrial applications requiring ultra-high reduction ratios, direct shaft mounting, high torque output, and stable low-speed operation. By combining an inline helical gearbox with a helical worm gearbox, the unit achieves significantly higher reduction ratios than conventional worm gear units while maintaining smooth transmission performance and compact dimensions. The hollow output shaft design enables direct mounting onto driven shafts, eliminating additional couplings and simplifying installation. It is widely used in conveyors, mixers, lifting equipment, and bulk material handling systems. Output torque ranges up to 35,000 Nm, while input power capacities range from 0.18 kW to 160 kW depending on configuration.
| Item | Specification |
| Gear Type | Combined Helical + Helical Worm |
| Mounting Type | Hollow Shaft Mounted / Torque Arm Mounted / Flange Mounted |
| Input Type | IEC Motor Input / Shaft Input |
| Output Shaft Type | Hollow Output Shaft |
| Housing Material | High-Strength Cast Iron |
| Gear Material | Alloy Steel / Bronze Worm Wheel |
| Gear Surface Hardness | HRC58–62 |
| Transmission Efficiency | Up to 92% |
| Ratio Range | 100 – 20,000+ |
| Output Torque | 500 – 35,000 Nm |
| Motor Power | 0.18 – 160 kW |
| Lubrication | Oil Bath Lubrication |
| Connection Type | Hollow Shaft Direct Mount |
| Protection Class | IP55 (Optional IP65) |
| Ambient Temperature | -20°C to +40°C |
| Model | Ratio Range | Output Torque (Nm) | Motor Power (kW) |
| SARF37 | 100 – 500 | 800 | 0.18 – 3 |
| SARF47 | 150 – 800 | 1,500 | 0.37 – 5.5 |
| SARF57 | 200 – 1500 | 3,000 | 0.55 – 11 |
| SARF67 | 300 – 3000 | 6,500 | 1.1 – 22 |
| SARF77 | 500 – 5000 | 12,000 | 2.2 – 45 |
| SARF87 | 800 – 10,000 | 22,000 | 4 – 90 |
| SARF97 | 1000 – 20,000+ | 35,000 | 7.5 – 160 |
