Image:Counterbore hole stainless steel.jpg|thumb|right|A counterbore in a piece of metal.
English
Etymology
from counter- (against) + bore (hole)
Noun
counterbore
- A cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface.
- The tool with which a counterbore is machined.
Transitive verb
rfc-trverb|Transitive verb
counterbore
- To create such a cylindrical recess.
See also
countersink
spotface
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