"Prevailing torque nut" is the technical name. Sorry to say but, good luck finding Gr8 7/16-20. You will see them on the net but they are not really there
Amazon shows them at $20 each?
How about just red Loctite on super clean threads. Torque and forget about it...... Unless your handy dandy bolt place has the nuts at reasonable price.
All that being said, all I ever use is lock washers. I don't want to pretend to use deformed thread or Loctite.
