"The Nylock nuts are very good for moderate temperature applications."
My rule of thumb is "people temperatures", and no Sun.
I've had the insert crack due to cold, and UV, on very rare occasion fall out, or migrate and open up in the heat, to the point one can spin a nyloc almost as easily as a standard nut.
I don't like split or star lock washers because they shred whatever they touch, the split washers even worse, often scything off metal, leaving gouges, ridges, burrs, and debris long before torque spec is reached.
Truly horrific things.
I like Hex Flange Lock Nuts, as shown here:
They come in various grades, and materials, they hold, and the flange spreads out the holding pressure, important in some applications.
You can see an example of a flanged hex lock nut application in the attached image of a pair of guy brackets I made. The nylocs, by the way, also have a drop of loctite, just to be safe.
Kurt
