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Meanings of countersink bit in English

A bit for enlarging the upper part of a hole.

        Synonyms
        Examples for "countersink"
        Examples for "countersink"
        1
        Button head bolts are often used on thin holds that have no countersink.
        Rock and Ice Magazine
        2
        Worn somewhat into the soil, this road served as a countersink and strengthened the position.
        Destruction and Reconstruction: / Personal Experiences of the La...
        3
        The valves, C, and their seats, B, bored with a countersink bit, are plainly shown.
        The Boy Mechanic, Volume 1: 700 Things for Boys to Do
        4
        Maximum stress was found on the lateral border of the number 5 countersink of the plate.
        Pubmed
        5
        Drill and countersink two smaller holes for 2-in.
        The Boy Mechanic, Volume 1: 700 Things for Boys to Do
        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
        Usage of countersink bit in English
        1
        The valves, C, and their seats, B, bored with a countersink bit, are plainly shown.
        The Boy Mechanic, Volume 1: 700 Things for Boys to Do