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    Countersink - Wikipedia

    • In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt, screw or rivet, when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat-bottomed hole that mi… See more

    Types

    A countersink may be used in many tools, such as drills, drill presses, milling machines, and lathes.
    A cross-hole, "Weldon style" or "zero flute" countersink is a cone-shaped tool with a cutting edg… See more

     
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