the difference between NPT, PT, G thread

NPT,PT,Gare pipe threads.

NPT is the abbreviation of National (American) Pipe Thread, which belongs to the American standard 60-degree taper pipe thread and is used in North America. National standards can be found in GB/T12716-1991

PT is the abbreviation of Pipe Thread. It is a 55-degree sealed tapered pipe thread. It belongs to Wyeth thread family and is mostly used in Europe and Commonwealth countries. Commonly used in water and gas pipe industry, taper regulation is 1:16. National standards can be found in GB/T7306-2000

G is a 55 degree non-threaded sealing pipe thread, belonging to the Wyeth thread family. Mark G for cylindrical thread. National standards can be found in GB/T7307-2001

other threads refer to the diameter of the thread size in inches. People in the industry usually call thread size by points, one inch equals 8 points, 1/4 inch equals 2 points, and so on. G is the general designation of pipe thread (Guan), and the division of 55,60 degrees is functional, commonly known as pipe circle. That is, the thread is machined from a cylindrical surface.

ZG is commonly known as pipe cone, that is, the thread is processed by a conical surface. General water pipe joints are like this, and the national standard is marked Rc

metric threads are expressed by pitch, while US-English threads are expressed by the number of threads per inch, which is the biggest difference between them.,

metric thread is a 60-degree equilateral tooth type, the English thread is an isosceles 55-degree tooth type, and the American thread is 60-degree.

metric threads and imperial units are used for U. S.-British threads.

pipe thread is mainly used for the connection of the pipeline, and the internal and external threads are closely matched. There are two types of straight pipe and tapered pipe. The nominal diameter refers to the diameter of the pipe connected, and it is obvious that the thread diameter is larger than the nominal diameter.

NPT is the United States standard 60 degree taper pipe thread, is a dry seal,national standard GB/T12716-1991.

PT is 55 degree sealed conical pipe thread, plus ptfe material seal,national standards can be GB/T7306-2000.

ZG is 55 degree pipe taper thread, plus ptfe material seal