In mechanical drawings, what does a dashed line typically represent?

In mechanical drawings, what does a dashed line typically represent?

• A. The boundary of the drawing.
• B. Centerlines only.
• C. Hidden edges or features not visible in the current view.
• D. The edge of the material.

Answer: (A)

In mechanical drawings, line style communicates how much of the geometry you can actually see in the given view. A dashed line is used to show features that exist but aren’t visible from the current perspective—hidden edges or features such as holes, slots, or internal features behind other surfaces. This helps the reader understand the full shape without needing extra views. This differs from the drawing boundary, which is shown with a solid border around the view, or from centerlines, which use a specific long–short dash pattern to indicate the part’s axis or symmetry. The edge of the material in a visible view is drawn with solid lines, representing what’s directly visible.

In mechanical drawings, line style communicates how much of the geometry you can actually see in the given view. A dashed line is used to show features that exist but aren’t visible from the current perspective—hidden edges or features such as holes, slots, or internal features behind other surfaces. This helps the reader understand the full shape without needing extra views.

This differs from the drawing boundary, which is shown with a solid border around the view, or from centerlines, which use a specific long–short dash pattern to indicate the part’s axis or symmetry. The edge of the material in a visible view is drawn with solid lines, representing what’s directly visible.