noun
edge face; end face
Technical term used in engineering, manufacturing, and materials science to refer to the face at the end or edge of an object, such as a board, pipe, or sheet.
パイプの端面をきれいに仕上げてください。
Please finish the end face of the pipe neatly.
この部品の端面にはバリが残っている。
There are burrs left on the edge face of this part.