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I am starting in on a cargo trailer conversion and the first "screw" I attempted to remove (that fastens the plywood would the metal supports) would not thread out and I stripped it. I managed to extract it. It had a Phillips head, but it's more like a nail.

I have seen other videos where owners have encountered these fasteners and said they are a pain to remove. But I haven't found one that identifies it by name. Which would help in my search to identify the best way to extract these things.

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Jay Cummins
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It's called spiral shank nail or screw nail.

cbeleites unhappy with SX
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I think it is a concrete nail.

Not made of concrete but for use in concrete. ;)-

Alaska Man
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    i agree that it looks like a hardened steel concrete nail, but the OP stated that it has a phillips socket ... i have a suspicion that it is something like a concrete nail, but meant for driving into steel ... no idea why it has a phillips socket – jsotola Aug 17 '20 at 00:49
  • @jsotola correct. Philips head. And commonly used in cargo trailers in the US (unfortunately for me). – Jay Cummins Aug 17 '20 at 12:09