The difference between NPT/PT thread and G thread
http://www.ym-valves.com/news/industry-news/npt-pt-g-thread.html
1.The abbreviation of the NPT is National (American) Pipe Thread, belong to the American standard of 60 degrees taper Pipe threads, it main used in North America. The National standard for GB/T12716 2.The abbreviation of PT is Pipe Thread, 55 degrees sealed tapered Pipe Thread, belongs to the family of wyeth Thread,it main used in Europe and the commonwealth countries. fpt
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