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]

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]

 

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Sun 09th December 2018