What are the differences between tapered pipe threads and circular pipe threads?
Thread Content
What are the differences between tapered pipe threads and circular pipe threads? What determines these differences? As for the classification of threads, it is actually based on factors such as the thread angle, right?
1. In terms of practicality, the sealing performance of tapered pipe threads is higher than that of cylindrical pipe threads. 2. The symbols used are different. 3. The tooth shapes are different.
The tapered and cylindrical pipe threads commonly used in our country both have a thread angle of 55 degrees, corresponding to the codes ZG and G – which are the first letters of \"tapered\" and \"cylindrical\" respectively (in the United States, tapered pipes use a 60-degree thread angle, with the code NPT). Tapered pipe threads are sealed pipe threads that can prevent leakage without the need for packing or sealing materials, and they are typically used under high temperature and pressure conditions ； Cylindrical pipe threads require the use of packing, etc.; typically, PTFE is wrapped around them on-site or seals and gaskets are used ； Tapered external threads and cylindrical internal threads can also be used together as sealing pipe threads, for pressures up to 5 bar.
Pipe threads come in metric, imperial, and American types; the so-called cylindrical pipe threads refer to a type used in general sealing applications
Standard metric M； Cylindrical pipe thread G ； Tapered tube ZG ； NPT American standard taper tube
You can check GB/T 20333-2006|Basic dimensions and markings for taps for cylindrical and tapered pipe threads