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Countersink   Listen
Countersink

verb
(past countersank; past part. countersunk; pres. part. countersinking)
1.
Insert (a nail or screw below the surface, as into a countersink).  Synonym: set.
noun
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 hole.  Synonyms: counterbore, countersink bit.



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"Countersink" Quotes from Famous Books



... happen to need for any special purpose, so that by making these at the time I happen to want a tool that I cannot purchase, I have accumulated quite a variety of odd tools; among them are a varied lot of millers, for milling and raising jewels, and deepening the countersink holes for jewel settings and screw heads, also a tool for holding a roller, to set the jewel pin, and one for holding the hair spring collet, and a pair of tweezers for holding jewels while cleaning, etc., etc. As to lathes, I have found that there is a necessity of ...
— Scientific American Supplement, No. 664, September 22,1888 • Various
... to use brass screws around electrical apparatus. For the small work, for binding-posts, etc., use 5/8 No. 5. Another handy size is No. 7, from 3/4 to 1-1/4 in. long. The round-headed screws are best, unless you want to countersink them. ...
— How Two Boys Made Their Own Electrical Apparatus • Thomas M. (Thomas Matthew) St. John


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