What does "angularity" specifically control in a feature?

• A. The radius of curvature of a feature
• B. The precise angle of a feature relative to a datum line or plane
• C. The size of the feature
• D. The color of the part surface

Answer: (B)

The term "angularity" in geometric dimensioning and tolerancing (GD&T) specifically controls the precise angle of a feature relative to a datum line or plane. It establishes a tolerance zone within which the feature must lie, ensuring that the angle is maintained accurately. This control is crucial in applications where the orientation of a feature is critical for the functionality of the assembly or the overall geometry of the part.

For example, if a hole must be drilled at a 30-degree angle relative to a flat surface, angularity ensures that this requirement is met, which is vital for parts that need to fit together or function properly within a mechanical assembly. By establishing a tolerance for the angle, angularity ensures consistent manufacture and assembly, contributing to the overall quality of the final product.