锪孔 meaning in Chinese

counter boring
counter sinking
counterboring
countersinking
dimpling
spot facing
spot-facing

Drills and reamers - spot drills
钻头和铰刀.锪孔钻
Back spotfacing machine
背锪孔钻床
En 2264 aerospace series . nuts , anchor , self - locking , floating , two lug , incremental counterbore , in alloy steel , cadmium plated , mos2 lubricated . classification : 900 mpa at ambient temperature 235 degrees celsius
航空航天系列.合金钢镀镉mos2润滑深锪孔双耳锁紧浮动地脚螺母.等级: 900mpa 235