COUNTERSUNK

COUNTERSINK

set, countersink

(verb) insert (a nail or screw below the surface, as into a countersink)

Source: WordNet® 3.1

Verb

countersunk

past participle of countersink

Adjective

countersunk (not comparable)

(of a bolt or screw) That has a flat conical top allowing it to be inserted flush with a surface

Source: Wiktionary

Coun"ter*sunk` (-snk`), p. p. & a. from Countersink.

1. Chamfered at the top; -- said of a hole.

2. Sunk into a chamfer; as, a countersunk bolt.

3. Beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead.

COUNTERSINK

Coun"ter*sink` (koun"tr-sk`; 277), v. t. [imp. & p. p. Countersunk (- s; 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.

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

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.

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.

2. A drill or cutting tool for countersinking holes.

Source: Webster’s Unabridged Dictionary 1913 Edition