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I fail to grasp what can be screwed on them, can you explain what are these for?

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They are used for attaching a heat sink.

Sun UltraSPARC with heatsink

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    Beat me to it. Here's a link to an ebay listing showing an UltraSPARC CPU module with the heatsink in place. May 27, 2021 at 11:22
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    I was trying to think where else I'd seen that sort of thing - the DEC Alpha 21064 package has screws too.
    – dave
    May 27, 2021 at 11:49
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    And who can forget the torque screwdriver that came inside the Sun 280r (p71 of the PDF) :-D Sun Type 7 keyboards are still the best.... May 27, 2021 at 21:17
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    The heatskink is bolted to the daughterboard too (rhs of your photo) I don't recall if there's a clamp holding the CPU's pins too, or if the big sandwich is doing all the retention of CPU as well.
    – Criggie
    May 28, 2021 at 1:38

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