The formula to calculate the Lead Angle (LA) is:
\[ LA = \arctan \left( \frac{L}{\pi \cdot D} \right) \]
Where:
A lead angle is defined as the angle between a thread and the plane of rotation the thread sits on. This can also be applied to helixes.
Consider an example where:
Using the formula to calculate the Lead Angle:
\[ LA = \arctan \left( \frac{5}{\pi \cdot 10} \right) \approx 9.09 \text{ degrees} \]
This means that the lead angle for this example is approximately 9.09 degrees.