Fastenal

This is a industrial type hardware store for the surrounding industrial yards here on Engineers road. They can pretty much get you any type of fastening hardware as well as regular things like tools, angle grinders and all tread sticks.
The difference here is that it is laid out in a more traditional hardware store, where the bulk of the store is out in front, not behind the counter like most similar places.
This is my go to place when I need 200 2″ diameter grade G bolts or tubs of nickle anti seize. They usually have big time heavy duty items in that bulk amount. If not, there is a big nationwide network that they draw from and can get it delivered to this store in just a few days.
Its open to the public, but keep in mind that items such as hardware is typically in bulk, you might luck out and its in small packs of 4.