# Load Ratings
## Load Ratings
Ratings are based on testing conducted by REV Robotics on the UltraPlanetary system. All load ratings are based on a safety factor of 1.2 to accommodate manufacturing tolerances. The torques listed are for the output of the stage.
| Cartridge | Torque |
| ------------- | --------------- |
| 3:1 Cartridge | Fails at 40 N-m |
| 4:1 Cartridge | Fails at 40 N-m |
| 5:1 Cartridge | Fails at 40 N-m |
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Shock loads can cause the gearbox to fail in situations where the steady-state torque is still within allowable limits.
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Cantilevered load on the output shaft puts additional stress on the gearbox and will reduce the torque the gearbox can withstand.
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## Cartridge Configuration
Cartridge configuration tables for UltraPlanetary use a red rating system. If the motor and gear ratio combination is highlighted in red, the torque created by the motor can damage the gearbox. Non-highlighted combinations are within acceptable torque ranges.
Nominal gear ratios are used to reference the cartridge for ease of use in the following charts. \
For actual gear ratios for an individual cartridge, please reference the [Actual Cartridge Gear Ratios Table.](https://docs.revrobotics.com/rev-crossover-products/ultraplanetary/cartridge-details) The final actual gear ratios are indicated in the cells.
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When building your gearbox, make sure the highest gear reduction is closest to the motor.
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### HD Hex Motor Load Ratings
#### Load Rating for Two-Stage Gearboxes
#### Load Rating for Three-Stage Gearboxes
#### Load Rating for Four-Stage Gearboxes
### NEO 550 Load Ratings
#### Load Rating for Two-Stage Gearboxes
#### Load Rating for Three-Stage Gearboxes
#### Load Rating for Four-Stage Gearboxes
