Engineering Drawing
This is the smallest diameter of a screw thread:

External thread diameter
Minor diameter
Internal thread diameter
Major diameter

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Engineering Drawing
How can the drafter prevent Auto-CAD from placing or stacking another center mark on a circle when adding a diameter dimension to it?

Use the trim tool to take away the stacked center mark
It can't be done
Explode the dimension and then erase the center mark
Use the Properties dialog box to turn off the center mark of the dimension

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