counterboring meaning in Chinese
扩钻
锪孔
锪圆柱沉孔
Examples
- Counterboring drill press
平底扩孔钻床 - Manufacturing processes chip removal - part 2 : drilling , countersinking and counterboring , reaming ; classification , subdivision , terms and definitions
排屑加工工艺.第2部分:钻孔钻沉头孔和锪沉头孔铰