What type of geometric tolerance is indicated in the feature control frame?

The indicated geometric tolerance in the feature control frame corresponds to Circularity. This tolerance relates to how "round" a circular feature should be, ensuring that all points on the surface of the feature are equidistant from its central axis. Circularity helps maintain the performance and fit of parts in assembly by ensuring smooth and uniform engagement between mating components.

In manufacturing and quality control, circularity is critical for rotational parts—such as shafts or disks—where any deviation from a perfect circle could lead to imbalances and improper functionality. Understanding this concept allows engineers and quality control personnel to ensure that parts will work effectively in their intended applications, maintaining precision and reducing wear over time.