counterbore

[ koun-ter-bawr, -bohr; koun-ter-bawr, -bohr ]

/ ˈkaʊn tərˌbɔr, -ˌboʊr; ˈkaʊn tərˈbɔr, -ˈboʊr /

noun

a tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head.

the portion of the hole so enlarged.

verb (used with object), coun·ter·bored, coun·ter·bor·ing.

to enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter.

Origin of counterbore

First recorded in 1605–15; counter- + bore²

OTHER WORDS FROM counterbore

coun·ter·bor·er, noun

Words nearby counterbore

counterattraction, counterbalance, counterbid, counterblast, counterblow, counterbore, counter-boulle, counterbrace, counterchange, countercharge, countercheck

Example sentences from the Web for counterbore

The jaw end is counterbored out with a 45-degree counterbore to form a bearing for the forward end of the micrometer screw.
Measuring Tools|Unknown
If taken off at all it must be pulled, for the dowel-pins, key and counterbore are close fits.
Steam Turbines|Hubert E. Collins
That it may always do this and yet leave sufficient clearance, the counterbore has been devised.
Farm Engines and How to Run Them|James H. Stephenson
For counterboring small holes or for facing the metal around their ends, the form of counterbore shown in Fig. 1746 is employed.
Modern Machine-Shop Practice, Volumes I and II|Joshua Rose

For enlarging a hole for a certain distance the counterbore is employed.
Modern Machine-Shop Practice, Volumes I and II|Joshua Rose

单词	counterbore
释义	counterbore [ koun-ter-bawr, -bohr; koun-ter-bawr, -bohr ] / ˈkaʊn tərˌbɔr, -ˌboʊr; ˈkaʊn tərˈbɔr, -ˈboʊr / noun a tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head. the portion of the hole so enlarged. verb (used with object), coun·ter·bored, coun·ter·bor·ing. to enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter. Origin of counterbore First recorded in 1605–15; counter- + bore² OTHER WORDS FROM counterbore coun·ter·bor·er, noun Words nearby counterbore counterattraction, counterbalance, counterbid, counterblast, counterblow, counterbore, counter-boulle, counterbrace, counterchange, countercharge, countercheck Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for counterbore The jaw end is counterbored out with a 45-degree counterbore to form a bearing for the forward end of the micrometer screw. Measuring Tools\|Unknown If taken off at all it must be pulled, for the dowel-pins, key and counterbore are close fits. Steam Turbines\|Hubert E. Collins That it may always do this and yet leave sufficient clearance, the counterbore has been devised. Farm Engines and How to Run Them\|James H. Stephenson For counterboring small holes or for facing the metal around their ends, the form of counterbore shown in Fig. 1746 is employed. Modern Machine-Shop Practice, Volumes I and II\|Joshua Rose For enlarging a hole for a certain distance the counterbore is employed. Modern Machine-Shop Practice, Volumes I and II\|Joshua Rose
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