Up here in Puget Sound, we have McLendon's Hardware. Kinda like the old Arrow Hardware stores in Orange, CA., where you could bring in a grease - covered piece of ... practically anything... and say " HELP". The clerk would give it a quick glance and say : " How many do you need, and with or without the grease ??? "
My dad has always rated a hardware store by their fasteners, and McLendon fits the requirement. Woodruff keys, clevis pins, parachute pins, allen head bolts, LOTSA stainless nuts and bolts too. ( Fullerton Ace Hardware is his favorite. ) They might even have left - hand thread, metric stainless steel wing nuts, though I haven't needed one ( yet ) so I don't know for sure.
Sad to report, however, McLendon Hardware and its 7 locations were sold by the founding family a year or so ago, and the cheapening - down has begun. On my last visit the hardware dept. clerk informed me they no longer stock the loose small number drill bits that are so handy for model railroad projects. Now I have to buy the whole index just to get the number 43 & 44 drills I use so much.
I wonder if the hardware store issues are due to today's generation that never learned how to work with their hands. High Schools have cut out much or all of their Industrial Arts programs, and with them the confidence that is needed.