I used a long bolt as a shaft, and the end of the spool is held on with a nut.

我用很长的螺栓作为骨干，并在年底举行的阀芯是一个螺母。

youdao

For compression end connection, first slide compression nut onto copper tube, then slide on ferrule.

对于压缩端口连接，首先将压缩螺母移动到铜管上，然后装上套圈。

youdao

The tube nut is placed over the end of the copper tube to be joined; the tube end then is flared out at an approximate 45 degree Angle by a flaring tool.

管道螺母放置在连接铜管的末端端口上，然后采用扩口工具将管道端口扩口成45度角。

youdao

The NUT says some teachers did not receive their application forms until the end of May - days before the deadline.

BBC: Teachers' pay 'a monster'