NPT,PT,G管螺纹的区别 及螺纹标准（NPT, PT, G pipe thread and thread standard）.docVIP

NPT,PT,G管螺纹的区别 及螺纹标准（NPT, PT, G pipe thread and thread standard） The difference between the NPT, PT, and G pipe threads NPT, PT, G are all pipe threads. The NPT is an abbreviation of the National (American) Pipe Thread, which belongs to the American standard 60 degrees cone Thread for North America. National standards can be read GB/t12716-1991 Is the abbreviation of PT is Pipe Thread, 55 degrees sealed tapered Pipe Thread, belongs to the family of wyeth Thread, used in Europe and the commonwealth countries. More commonly used in water and gas Pipe industry, for 1:16 taper regulations. The national standards for GB/T7306-2000 G is a 55c non-threaded seal pipe thread, belonging to the wyeth thread family. The mark is G for cylinder thread. National standard can be read GB/t7307-2001 In the other thread 1/4, 1/2, 1/8 mark refers to the diameter of the thread sizes, the unit is inch. Inline people usually use points to call thread sizes, one inch equals eight points, and 1/4 inch is 2 points and so on. G is the general term for pipe threads, and 55,60 degrees are functional, known as pipe circles. The thread is made from a cylindrical surface. The ZG is commonly known as the pipe cone, which is made from a cone, and the common water pipe is the same. The national label is the Rc The metric thread USES pitch to indicate that the American and British threads are the biggest difference in terms of the number of threads per inch. The metric thread is 60 degrees equilateral tooth type, the English thread is equal waist 55 degree tooth type, beautiful thread 60 degree. The metric thread is used in metric units, and American and British threads are made of British units. The pipe threads are mainly used for the connection of the pipe, and the inside and outside threads of the pipe are tightly coupled, and there are two kinds of straight pipe and cone pipe. The nominal diameter is the diameter of the pipe that is connected, and it is clear that the diameter of the thread is