countersink

Noun · Verb
Synonyms: counterborecountersink bitset

WordNet 3.0

Noun (2)

  1. a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface
  2. a bit for enlarging the upper part of a holeSynonyms: counterborecountersink bit

Verb (1)

  1. insert (a nail or screw below the surface, as into a countersink)Synonyms: set
Advertisement

Webster's Dictionary (GCIDE)

Countersink \Coun"ter*sink`\ (koun"t[~e]r*s[i^][ng]k`; 277), v. t. [imp. & p. p. Countersunk (-s[u^][ng]k`); p. pr. & vb. n. Countersinking.]

1.To chamfer or form a depression around the top of (a hole in wood, metal, etc.) for the reception of the head of a screw or bolt below the surface, either wholly or in part; as, to countersink a hole for a screw. [1913 Webster]

2.To cause to sink even with or below the surface; as, to countersink a screw or bolt into woodwork. [1913 Webster]

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]

Advertisement