I can't pick a regular hex nut with smart fasteners

The hex nuts are in the toolbox, and all of the part numbers are assigned to them. When I go to add a smart fastener and then add to the bottom stack, the standard hex nut doesn't even show up as an option.

I have:

  • Heavy Hex Jam Nut
  • Heavy Hex Nut
  • Hex Jam Nut
  • Hex Thick Nut
  • Heavy Hex Slotted Nut
  • Hex Slotted Nut
  • Hex Thick Slotted Nut

But I don't have "Hex Nut" as an option. Is it hidden somewhere in the options shown?

SolidworksToolbox