出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2010/08/25 22:53 UTC 版)
A counterbore can refer to a cylindrical flat-bottomed hole, which enlarges another hole, or the tool used to create that feature. It is usually used when a bolt or cap head screw is required to sit flush with or below the level of a workpiece's surface (By comparison, a countersink makes a conical hole and is used to seat a flathead screw ). A very shallow counterbore, such as one machined on a cast part to provide a flat surface for a fastener head, may also be called a spot face.
quarter-binding
quarter-binding
兵員簿
the muster-roll
the back entrance
the horizontal axis
反対方向.