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counterbore

Translation
counterbore
—counterborer, n.
/kown"teuhr bawr', -bohr'; kown"teuhr bawr", -bohr"/, n., v., counterbored, counterboring.
n.
1. a tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head.
2. the portion of the hole so enlarged.
v.t.
3. to enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter.
[1605-15; COUNTER- + BORE1]

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Universalium. 2010.

  
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  • Counterbore — Coun ter*bore ( b?r ), n. 1. A flat bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head. [1913 Webster] 2. A kind of pin drill with the cutting edge or edges normal to the… …   The Collaborative International Dictionary of English

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  • Counterbore — A counterbore in a metal plate A counterbore can refer to a cylindrical flat bottomed hole, which enlarges another hole, or the tool used to create that feature. A spot face is a very shallow counterbore. A counterbore hole is used when a… …   Wikipedia

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  • counterbore — 1. раззенкованная часть замков бурильных труб 2. развёртка; отверстие, обработанное развёрткой || развёртывать отверстие * * * раззенкованная часть (напр., замков бурильных труб) * * * употребляется в сочетаниях counterbore of tool joint …   Англо-русский словарь нефтегазовой промышленности