by KE4AVB » Fri Jun 01, 2018 5:14 am
Sorry for the late response as I had keyboard failure. Saying they are self tapping was a general description. They are actually thread forming type and don't actually cut new threads but form threads by raising threads though the process of pressure.
It is like saying a thread chaser tap is the same as a thread cutting tap. Two similar looking items but with two different purposes. As threading forming screws they are the same as thread forming taps and dies. They raise the threads, a process we all have seen the results of if you ever use those screws with captive washers.
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