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Countersink   Listen
verb
Countersink  v. t.  (past countersank; past part. countersunk; pres. part. 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.


noun
Countersink  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.





Collaborative International Dictionary of English 0.48


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"Countersink" Quotes from Famous Books



... It is better 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
... the size of the egg to be operated upon. Drills are to be procured from the various dealers, but can be made from steel wire softened in the fire and filed to a sharp three-cornered point—afterwards tempered to hardness—for the smaller eggs, or filed up for the larger eggs to the pattern of a "countersink" used for wood; indeed, the smallest-sized "countersink" made—to be procured at any ironmonger's—will do very well for eggs the size of a hen's. Capital egg-drills are to be made from "pinion wire" used by watchmakers. ...
— Practical Taxidermy • Montagu Browne
... amount of carpentry, and in addition to bradawl, screwdriver, and footrule you will need a hard pencil and a carpenter's square, as well as some stout iron screws one inch long. Two screws are sufficient for each strip. If you are anything of a carpenter you will countersink the holes for the heads of the screws; this will also prevent a ...
— The Book-Hunter at Home • P. B. M. Allan
... various dealers, but can be made from steel wire softened in the fire and filed to a sharp three-cornered point—afterwards tempered to hardness—for the smaller eggs, or filed up for the larger eggs to the pattern of a "countersink" used for wood; indeed, the smallest-sized "countersink" made—to be procured at any ironmonger's—will do very well for eggs the size of a hen's. Capital egg-drills are to be made from "pinion wire" used by watchmakers. Simply file to a point, and "relieve" with a small ...
— Practical Taxidermy • Montagu Browne
... of wood, a 4 by 4 inch studding, four inches long. Get a piece of metal one-half inch thick and two inches square. Have a blacksmith or machinist bore a quarter-inch hole through it in the center and countersink the upper side so it may be securely fastened in a mortise in the block, with its upper side flush with the upper surface of the block. Now, with a file, finish off one edge, going back for a quarter of an inch, the angle at A to be ...
— Carpentry for Boys • J. S. Zerbe


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