a conterbore

a conterbore
Countersink Coun"ter*sink`, n. 1. An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt. [1913 Webster]

Note: In the United States a flaring cavity formed by chamfering the edges of a round hole is called a countersink, while a cylindrical flat-bottomed enlargement of the mouth of the hole is usually called {a conterbore}. [1913 Webster]

2. A drill or cutting tool for countersinking holes. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Countersink — Coun ter*sink , n. 1. An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt. [1913 Webster] Note: In the United States a flaring cavity formed by chamfering the edges of a round hole… …   The Collaborative International Dictionary of English

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