What thread is G?

G is the thread of 55-degree unthreaded sealing pipe, belonging to Wyeth thread family, and the mark G stands for cylindrical thread.

The marks 1/4, 1/2 and 1/8 in the thread refer to the diameter of the thread size in inches. One inch equals eight points, 1/4 inches equals two points, and so on. 1/4, 1/2 and 1/8 are the nominal diameters of English threads in inches.

The thread of G 1/2 is a half-inch cylindrical pipe thread, with an outer diameter of 20.956 mm, a middle diameter of 19.794 mm, a bottom diameter of 18.632 mm, and a tooth profile of 55 degrees. Each inch 14 teeth is equal to 25.4 mm. ..

Extended data:

Thread standard

NPT, PT and G are all pipe threads.

NPT is the abbreviation of National(American) pipe thread, which belongs to American standard 60-degree taper pipe thread and is used in North America. See GB/t12716-1991for the national standard.

PT is the abbreviation of Pipe Thread, which is a 55-degree sealed conical pipe thread. It belongs to Wyeth thread series and is mainly used in Europe and Commonwealth countries. Commonly used in water pipe and gas pipe industries, the taper is specified as 1: 16. See GB/T7306-2000 for national standards.

G is the thread of 55-degree unthreaded sealing pipe, which belongs to Wyeth thread series. Mark g stands for cylindrical thread. See GB/T7307-200 1 for the national standard.

References:

Baidu Encyclopedia Entry-English Thread