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Composition of double ferrule joints such as end straight joint, straight joint, tee joint, elbow, joint with movable nut, hinged joint, plug, transition joint: front snap ring, rear snap ring, nut

Stainless steel and carbon steel metric, American and British thread standards are commonly used

NPT, PT and G are 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 Refer to the national standard GB/T12716-1991PT is the abbreviation of Pipe Thread. It is a 55 degree sealed tapered pipe thread. It belongs to the Wyeth thread family and is mostly used in Europe and the Commonwealth countries. It is commonly used in the water and gas pipe industry. The taper is specified as 1:16. Refer to GB/T7306-2000 for the national standard

G is a 55 degree non thread sealing pipe thread, belonging to Wyeth thread family. The mark G represents cylindrical thread National standards can refer to GB/T7307-200. In addition, the 1/4, 1/2, 1/8 marks in the thread refer to the diameter of the thread size, in inches. Professionals usually refer to the thread size in minutes. One inch is equal to 8 minutes, 1/4 inch is 2 minutes, and so on G is the general name of pipe thread (Guan). The division of 55 and 60 degrees belongs to functional, commonly known as pipe circle. That is, the thread is machined from a cylindrical surface. ZG is commonly known as pipe taper, that is, the thread is machined from a cone surface. This is the case for common water pipe joints. The old domestic thread standard is that Rc external thread is R metric thread expressed by thread pitch, and American British thread is expressed by the number of threads per inch, which is their biggest difference. Metric thread is 60 degrees equilateral thread, British thread is 55 degrees isosceles thread, and American British thread is 60 degrees. Metric units are used for metric threads, and English units are used for American and British threads. Pipe threads are mainly used to connect pipes. The internal and external threads are closely matched, and there are two types of straight pipes and tapered pipes. The nominal diameter refers to the diameter of the connected pipe. Obviously, the major diameter of the thread is larger than the nominal diameter. 1/4, 1/2, 1/8 are the nominal diameters of inch threads, in inches.