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Any regular hex nut works just fine as a jam nut. Basically, a jam nut is when you jam two nuts together. (It is gay, because the nuts do touch.)
And note that those nylon inserts kinda only work once. The bolt carves a thread into the insert when you insert it, so it will be weaker the second time you insert it.
Honorable mention: cage nuts. A square nut, permanently attached to a fastener that can snap into a special square hole in a 19 inch server rack. When you tighten the bolt against the nut, it tightens against the fastener, so that the nut, bolt, and fastener are secure against the square hole.
I hate nylocks. They are such a bitch to work with in my experience
How so? I use the hell out of them, they're much nicer than using a lock washer
You can't easily spin them in hard to reach places, making it difficult to attach or take a long time to fasten/remove