Definition of Counterbore

1. Noun. A bit for enlarging the upper part of a hole.

Exact synonyms: Countersink, Countersink Bit
Generic synonyms: Bit



Definition of Counterbore

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

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

Definition of Counterbore

1. Noun. A cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface. ¹

2. Noun. The tool with which a counterbore is machined. ¹

3. Verb. (transitive) To create such a cylindrical recess. ¹

¹ Source: wiktionary.com

Counterbore Pictures

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Lexicographical Neighbors of Counterbore

counterbeats
counterbiblical
counterbid
counterbidder
counterbidders
counterbidding
counterbids
counterblast
counterblasts
counterblockade
counterblow
counterblows
counterbluff
counterbluffs
counterbombardment
counterbore (current term)
counterbored
counterbores
counterboring
counterboycott
counterboycotts
counterbrace
counterbraced
counterbraces
counterbracing
counterbuff
counterbuffs
countercall
countercalls
countercampaign

Literary usage of Counterbore

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Mechanical Engineering of Power Plants by Frederick Remsen Hutton (1897)
"... fitted to such nuts in order to avoid mutilating the corners. Such wrenches and spanners accompany every well-made engine. 160. The counterbore. ..."

2. International Library of Technology: A Series of Textbooks for Persons by International Textbook Company (1903)
"As it is rather difficult to remove the bushing, this method of making a counterbore adapted to several sizes of holes can only be considered as a makeshift ..."

3. Modern Shop Practice: A General Reference Work by Howard Monroe Raymond, American Technical Society (1916)
"142 represents a taper-shank counterbore for a taper collet, while Fig. ... Typical counterbore with Taper Shank Fig. 143. Typical counterbore with Straight ..."

4. Tool Making: A Practical Treatise on the Art of Making Tools, Jigs, and by Edward Russell Markham, American Technical Society (1919)
"Then the templet is placed in position, and, by means of a counterbore having a pilot which fits the hole in the templet, the jig is counterbored to the ..."

5. The American Machinist Shop Note Book: A Collection of Articles by E.A. Suverkrop (1919)
"ECONOMICAL HIGH-SPEED STEEL counterbore In view of the present high price and the difficulty of obtaining high-speed steel, it behooves both designer and ..."

6. Direct-acting Steam Pumps by Frank Ferdinand Nickel (1915)
"This is the case in a compound pump where the intermediate head is centered in the counterbore and also when the front head, with its stuffing-box, ..."

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