> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/rev-crossover-products/ultraplanetary/load-ratings.md).

# 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 |

{% hint style="danger" %}
Shock loads can cause the gearbox to fail in situations where the steady-state torque is still within allowable limits.
{% endhint %}

{% hint style="warning" %}
Cantilevered load on the output shaft puts additional stress on the gearbox and will reduce the torque the gearbox can withstand. 
{% endhint %}

## 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.](/rev-crossover-products/ultraplanetary/cartridge-details.md) The final actual gear ratios are indicated in the cells.

{% hint style="warning" %}
When building your gearbox, make sure the highest gear reduction is closest to the motor.
{% endhint %}

### HD Hex Motor Load Ratings

#### Load Rating for Two-Stage Gearboxes

<figure><img src="/files/9CSdHbsdGB2fVkGnT3Xr" alt=""><figcaption></figcaption></figure>

#### Load Rating for Three-Stage Gearboxes

<figure><img src="/files/NOtOu6fS9pmieq1Ys2Ez" alt=""><figcaption></figcaption></figure>

#### Load Rating for Four-Stage Gearboxes

<figure><img src="/files/7ps0TrLI2Q8CqEHTvCZK" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/u1vKdMI3S14msCkAmdx3" alt=""><figcaption></figcaption></figure>

### NEO 550 Load Ratings

#### Load Rating for Two-Stage Gearboxes

<figure><img src="/files/agNCIMe9gqA1RDl2bLTs" alt=""><figcaption></figcaption></figure>

#### Load Rating for Three-Stage Gearboxes

<figure><img src="/files/5bZEI5DdpmE9q3m8rBSp" alt=""><figcaption></figcaption></figure>

#### Load Rating for Four-Stage Gearboxes

<figure><img src="/files/B5EuB5LPYULb14LdiW84" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/JvQh4659ZYaOY0yTBtaB" alt=""><figcaption></figcaption></figure>