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Russian
зенкер
Wikidata

Flat-bottomed hole allowing a screw head to sit flush with a surface, or a tool for making such a hole.

        зенкер
        1
        The holes can be counterbored for the heads and then plugged.
        Mission Furniture: How to Make It, Part 3
        2
        To make the matter worse, quite a number of the wheels were found to have been counterbored about ½ in.
        Scientific American Supplement, No. 623, December 10, 1887
        3
        Today I counterbored the four holes in the fenders that will have 3.5 machine screws inserted to act as axles for the wheels.
        Wired