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Think of it this way.. hammer in a nail half way, do the same with a screw. Now smack both of them to fold them over at a 90 degree angle. The nail will fold over, the screw will snap.
That's tensile strength..
Now fasten a piece of plywood to a board with a nail and a screw. Take a flat pry bar or chisel and hammer it in between the plywood and board making contact with the nail and screw. The screw will snap faster then the nail.
That's sheer strength....
OK. Then are you saying that nails have both better tensile and sheer properties compared to screws? I guess that would make sense. I have never seen professionals using screws for framing up a house, for example.
I do know that if I use screws to hold two pieces of wood together, then they are much harder to pry up than two boards nailed together. And, in pallet nails, the toughest nails to take out are those spiral (screw) shank nails which really hold like buggers.