The KAT Series Hollow Output Shaft Torque-arm Mounted Helical Bevel Gearbox is designed for heavy-duty industrial transmission systems requiring flexible installation, high torque output, and reliable reaction torque absorption. The torque-arm structure allows the gearbox to operate without rigid base fixation while efficiently transferring reaction forces to the support frame, ensuring stable operation under high load conditions. The hollow output shaft enables direct shaft mounting, reducing coupling components and improving transmission efficiency. Combined with precision helical bevel gearing, the KAT Series delivers smooth operation, high load capacity, compact structure, and excellent shock resistance. It is widely used in conveyors, mining equipment, mixers, crushers, and bulk material handling systems. Output torque reaches up to 50,000 Nm, with motor power ranging from 0.12 kW to 200 kW depending on configuration.
| Item | Specification |
| Gear Type | Helical Bevel Gear |
| Mounting Type | Torque Arm Mounted |
| Input Type | IEC Motor / Solid Shaft |
| Output Type | Hollow Shaft |
| Gear Material | High-Strength Alloy Steel |
| Gear Hardness | HRC58–62 |
| Transmission Efficiency | Up to 95% |
| Ratio Range | 5 – 200 |
| Output Torque | Up to 50,000 Nm |
| Motor Power | 0.12 – 200 kW |
| Housing Material | High-Strength Cast Iron |
| Lubrication | Oil Bath Lubrication |
| Protection Class | IP55 (Optional IP65) |
| Ambient Temperature | -20°C to +40°C |
| Model | Ratio Range | Output Torque (Nm) | Motor Power (kW) |
| KAT37 | 5 – 30 | 200 | 0.12 – 3 |
| KAT47 | 10 – 50 | 600 | 0.37 – 5.5 |
| KAT57 | 10 – 70 | 1,200 | 0.75 – 11 |
| KAT67 | 15 – 100 | 3,000 | 1.5 – 22 |
| KAT77 | 20 – 120 | 7,000 | 3 – 45 |
| KAT87 | 25 – 160 | 15,000 | 5.5 – 90 |
| KAT97 | 30 – 200 | 50,000 | 7.5 – 200 |
