# ToleranceContribution

## Class Definition

```python
class ToleranceContribution(variable_expr_id: str, variable_name: str, nominal: float, source_tolerance: DimensionTolerance, sensitivity: float | None, lower_deviation: float, upper_deviation: float, source_unit: Unit | None = None)
```

*Source: tolerance.py*

## Import Surface

- top-level: `from simplecadapi import ToleranceContribution`

## Description

One source dimension's propagated contribution to a result.