6mm head nuts

i use nylock nuts on most of my bikes, as well as thicker flat washers. you'll notice after removing the head a few times the crappy flat washers are convex from biting into the aluminum.

i'd stay away from the stainless nuts. i've stripped a few threads on the studs because the metal's too soft, and stainless threads tend to be harder and sharper.
 
I use coupling nuts, instead of grabbing 4 or 5 threads I grab onto 1/2 inch
of the threads
 

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