| Qualitative level |
Scope of use |
| GL-1 |
For cylindrical gear transmission, screw, helical bevel gear, small load |
| GL-2 |
Used for powertrain systems such as group 1 but with high load capacity and high temperature |
| GL-3 |
Used for worm gear transmission, helical bevel gear bearing large load and high temperature. |
| GL-4 |
For hypoit gear drive system working at high speed and large torque |
| GL-5 |
For hypoit gear transmission system with large impact load, high speed, large torque |
| GL-6 |
For hypoit gear transmission systems with large impact loads, high speed of rotation and movement along cylinders, large torque transmission and high impact loads |
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