# stiffness

> The stiffness of the spring connected to this drive.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.3/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

```csharp
public float stiffness
```

### Remarks

Units of measurement - N/m (newtons per meter) for linear and Nm/radian (newton-meters per radian) for angular motion.