# reactionTorque

> Gets the reaction torque of the joint.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.5/script-reference/unityengine.md)
* **Assembly:** UnityEngine.Physics2DModule

```csharp
public float reactionTorque { get; }
```

### Remarks

When a joint tries to constrain a Rigidbody2D it may need to apply torque to do so.  This is known as the reaction torque.

Additional Resources: [Joint2D.GetReactionTorque](/engine/6000.5/script-reference/unityengine/joint2d/getreactiontorque.md), [Joint2D.breakTorque](/engine/6000.5/script-reference/unityengine/joint2d/breaktorque.md).