Monadnock Clip Nut
Perfect for what I needed - Clips to mount up my avionics trays in my radio stack using 6-32 countersunk screws. I had to run a #6 tap part-way into the nuts because it was a little tight and I ended up breaking a clip as I was tightening down a screw. They are expensive but, Im glad I ordered extras. One popped off as I was installing it - never to be seen again. And the extras came in handy to replace the one I broke before I got the tip from my IA about partially tapping them out. You do want to leave a little grab, as if you tap them out all the way, you defeat the purpose of the lock-nut.
Edge distance is .180-.280 | Panel thickness is .030-.051