What are the thread types of the phillips flat head screws?

There are two major types of screw types, one is a machine thread and the other is a self-tapping. So what are the thread types of the phillips flat head screws?
copper phillips flat head screws - self tapping sharp tail

carbon steel blue zinc plated phillips flat head screws - machine thread

carbon steel black zinc plated phillips flat head screws - machine half thread

carbon steel nickel plated phillips flat head screws - self tapping flat end

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