headless set screw

例句：

1. 1.The car was fixed with a headless set screw.
   这辆车被一个无头螺丝钉固定了。
2. 2. The construction worker used a headless set screw to tighten the bolts.
   建筑工人用一个无头螺丝钉来紧固螺栓。
3. 3. The engineer replaced the old set screw with a new one to ensure the safety of the machine.
   工程师用一个新的无头螺丝钉替换旧的，以确保机器的安全。