Counterbore

[Coun·ter*bore`]

A bit for enlarging the upper part of a hole

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A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.

Noun
a bit for enlarging the upper part of a hole


n.
A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.

n.
A kind of pin drill with the cutting edge or edges normal to the axis; -- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth.

v. t.
To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.


Counterbore

Coun"ter*bore` (-b?r`), n. 1. A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head. 2. A kind of pin drill with the cutting edge or edges normal to the axis; -- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth.

Counterbore

Coun`ter*bore" (koun`t?r-b?r"), v. t. To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.

A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.

To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.

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