counterbore

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English

A counterbore in a piece of metal.
Comparison of countersunk and counterbored holes.

Etymology

From counter- (“against”) +‎ bore (“hole”).

Noun

counterbore (plural counterbores)

  1. A cylindrical recess, typically machined at the mouth of a hole to admit a screw (such as a cap screw) so that the screw sits flush with a surface.
    Coordinate term: countersink (conical)
  2. The cutter used to cut such a recess. (Also used, at less depth, for spotfacing.)
    Hypernyms: cutter, cutting tool
    Meronyms: flute, pilot (the land at the tip, which rides the hole as a guide), shank
    Coordinate terms: countersink (conical); drill, drill bit; reamer; endmill

Translations

See also

Verb

counterbore (third-person singular simple present counterbores, present participle counterboring, simple past and past participle counterbored)

  1. (transitive) To create such a cylindrical recess.
    Coordinate terms: countersink (verb), spotface (verb)
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