合あわせ面めん

noun

matching surface; mating face

Technical term used in mechanical engineering and manufacturing for surfaces that are designed to fit together precisely.

• この部ぶ品ひんの合あわせ面めんは高たかい精せい度どで仕し上あげられている。

  The mating face of this part is finished with high precision.

• 合あわせ面めんに異い物ぶつが挟はさまると、漏もれの原げん因いんになる。

  If foreign matter gets caught on the matching surface, it can cause a leak.