splined mandrel

例句：

1. 1. The engineer used a splined mandrel to make the bolt tighter.
   工程师使用一个拉紧的芯棒使螺栓更紧。
2. 2.The tool is designed to fit snugly into the splined mandrel.
   该工具设计得能紧密地套在拉紧的芯棒上。
3. 3. The machine was equipped with a splined mandrel that could be easily adjusted for different applications.
   这台机器配备了一个可轻松调整以适应不同应用的拉紧芯棒。