COUNTERSINK • DICTIONARY ONE.COM • Definition of Countersink

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verb

Countersink v. t. (past countersank; past part. countersunk; pres. part. countersinking)

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.

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

noun

Countersink n.

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.

A drill or cutting tool for countersinking holes.

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Etymology of 'Countersink'

Collaborative International Dictionary of English 0.48

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"Countersink" Quotes from Famous Books

... 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

... seats, B, bored with a countersink bit, are plainly shown. The valves were made by threading a copper washer, 3/8 in. in diameter, and screwing it on the end of the valve rod, then wiping on roughly a tapered mass of solder and grinding it into the seats ...

— The Boy Mechanic: Volume 1 - 700 Things For Boys To Do • Popular Mechanics