Senco 08F175Y Duraspin# 8 by 1-3/4" Flooring to Wood Collated Screw (1, 000per Box)
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The two different thread sizes on these screws are for attaching a plywood subfloor to a wooden joist, which is why they are of different lengths. This screw binds two things together inside, despite the fact that any screw can do the job. In the elements, I believe they are a zinc composition and will rust, but how quickly depends on what climate you live in.
Then again, I guess there is no reason why they couldn't be used for this, but they do not come with self-reporting capabilities