What does the straightness symbol look like?

• A. A straight horizontal line
• B. A vertical line
• C. A curved line
• D. A dotted line

Answer: (A)

The straightness symbol in GD&T is represented by a straight horizontal line, often with a short vertical line at each end to indicate the feature's boundaries. This symbol signifies that a specified feature must remain straight within a defined tolerance zone. It assures that the feature does not deviate from the straight path more than the specified limit, and this is crucial for assemblies where such precision impacts function and fit.

Understanding the context of this symbol's use is important as it applies to various features, including edges and axes, to ensure they conform to the design intent. Recognizing the appearance of this symbol helps in interpreting mechanical drawings accurately, which is essential for successful manufacturing and inspection processes.