Fastenal shows them for $3.62 each. Nuts are $1.07 if you go with the hex nut. Both are grade 5.
Now, if you go with the square head nut, they are $4.50 a piece. No reason for the square nut, you only need the bolt head to be square.
So, if you add it up, $4.69 for each grade 5 square head bolt/heavy hex nut plus a little shipping. Sure as heck ain't $9 a pop.http://www.fastenal.com/web/home.ex This post was edited by Tom Fleming at 02:57:36 06/18/13.