I've found a screw like this.
It doesn't have a whole thread, it's threaded both near the tip and near the head but not in the middle.
What's the purpose of this?
Furthermore the thread is partially serrated, why?
What are these “split thread” screws for
screws
Related Solutions
That diameter would be very close to a M2.5 at 1.993mm minor screw. A hex head cap screw (AKA Allen head) could replace the Phillips.
Its also a bit smaller than an ANSI #4-40 at .0805inch minor
You could try the approximate size and get the matching tap for the closest interference fit.
It looks like a tamper-resistant hex screw. There are specific wrenches for these.
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Best Answer
Doing a quick image search on Google, it looks like Dan D.’s is correct. “That looks like a decking screw.” It is also referred to as a “terrace screw.”