[Phil]

Gentlemen:
I either use AN hardware mostly for high strength and shear applications where the bolt is a pivot, those 12 point nuts generally stay put, also Lawson makes a good variety of hardware in Uss, SAE, and metric sizes, they are better than grade 8 in strength, and there is a nice locknut available that they call a "C-Type" locknut, no plastic insert, and they really stay put. I favor these in areas such as engine bay etc., anywhere the environment is harsh. I just don't trust nylocks, I have seen too many of these degrade either from chemical, UV or heat, and once that locking material is compromised its just a plain old nut!
Hope this helps a little