Hand tools, the type that mostly have been replaced by power tools or were rendered unnecessary by factory prefabrication.
Stock metals in useful shapes (wire, tubing, bar stock).
Don't forget consumables.
Welding rods, cutoff wheels for grinders, grinding wheels, tool steel for lathe tools, or a supply of carbide inserts if that's your flavor. Particularly focus on stuff that stores well, is currently cheap, but under SHTF could be hard/impossible to get. Things like drill bits, which we basically take for granted the ability to get reasonably good and accurate drills.... if SHTF, that may change pretty quickly.
Definitely on board with the hand tools. I have acquired and learned to use a range of wood and metal working hand tools. Carpentry with hand tools, blacksmithing (including the production of charcoal for fuel in the event that gas and coke is unavailable). I also have a metal lathe and looking into getting a milling machine. With those tools, you can convert what seems to be useless scrap into new useable tools. The underlying aim is to get the tools required to make any tools I might need.
Concur with all
That's a good idea. Will add a roll of safety wire to my list.
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