fine-pitch thread

• 细牙螺纹

fine-pitch thread的用法和样例：

例句

1. For example, hydrogen and propane are used thread left teeth, also known as reverse-threaded, should pay special attention to the installation.
   例如氢气和丙烷均采用左牙螺纹，也称反向螺纹，安装时应特别注意。