counterbore

(用平底扩孔钻)扩孔［锪孔, 镗孔, 镗阶梯孔］, 沉孔, 埋头孔

词形变化

counterbores 复数 counterbores counterbored counterbores 三单 counterboring counterboring 现在分词 counterbored 过去式 counterbored 过去分词

释义与例句

n.
  1. 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.

  2. 2.

    The cutter used to cut such a recess. (Also used, at less depth, for spotfacing.)

    Meronyms: flute, pilot (the land at the tip, which rides the hole as a guide), shank

v.
  1. 1.

    To create such a cylindrical recess.

    及物

词汇关系

名词

同义词 1

countersink

上位词 1

bit

词源

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

来源：wiktionary