Found 1 items, similar to a conterbore.
English → English (gcide) Definition: 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]