A crescent wrench, wrenches or sockets, pliers or locking pliers.
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A box wrench has a closed end and is used to tighten or loosen nuts or bolts.
ANSI B18.1.1 is a standard for allowance in the thread of bolts and nuts, in which values of major dia, pitch dia etc is given for different classes of bolts and nuts.
Having 6 points of contact rather than just 4 (for square bolts and nuts) reduces the tendency to damage the nuts by shearing the edges. Of course, square bolts have an advantage if using an alternative tool (pliers, lock-grips) to hold or turn the bolt, because there is a wider surface to grip than with hex bolts.
Yes, they should be as tight as you can get with a 6 inch long wrench
The function of a socket wrench is to tighten or loosen nuts and bolts. It does this better by completely encompassing all sides of the nut.