Internal roll formed threads. Inspecting Pitch Diameter and Minor Diameter don't account for missing material at thread peaks.

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When roll forming internal threads, gaging the pitch diameter and minor diameter don't seem to be enough to verify that the thread form is good. By good, I mean the threads don't have deep valleys at the peaks. If I look at threads under a microscope, it seems like I should be able to see the bottom of the valleys that end up at the thread peaks...

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