....For common uses, a nut is a nut. What you're most likely to get at Home Depot is a common nut for a common use. That means that what you put it on isn't going to wiggle, flex, rattle, or make a lot of noise....

Actually Home Depot and most other hardware stores sell stiff nuts which won't work loose as well as an assortment of lock nuts and lock and spring washers, and maybe even castle nuts. Though none of these are necessary for a table saw.