screw threads In practice, many people encounter this situation:A screw can be threaded in, but no matter how tight it is, it won’t hold properly—or worse, it starts leaking or loosening. The first assumption is often incorrect sizing.However, in many cases, the real issue is: the wrong thread type was used. The most commonly confused types are:Machine Thread and Pipe Thread (often called “pipe thread” on site) Although they may look similar, their design purposes are complet