British Standard bsp swivel fittings content:

Bsp swivel fittings Pipe (Thread) British Standard Pipe thread.
NPT is the National (American) Pipe Thread American standard pipe thread, belonging to the American standard 60-degree taper pipe thread, for North America. National standards available bsp threaded pipe fittings national standards GB/T12716-1991.
NPT, PT, G various threads of distinction:
NPT, PT, G are pipe thread.
PT is Pipe Thread abbreviation is 55 degrees sealing tapered pipe thread, the thread is Wyeth family, and more for Europe and the Commonwealth countries. Water and gas pipes commonly used in the industry, the taper is defined as 1:16. National standards can be found GB/T7306-2000.
G is 55 degrees non-thread sealing pipe threads, bsp swivel fittings is threaded Wyeth family. Labeled G represents parher three wire connector cylindrical thread. National standards GB/T7307-2001 <BR> another thread can be found in the 1/4, 1/2, 1/8 mark refers to the thread size diameter in inches. Insiders often used to refer to the thread size of 1 inch equals 8 points, 1/4 inch is 2 points, and so on. G is the pipe threads collectively (Guan), 55, 60 degrees are divided into functional, commonly known as the tube round. That thread processing is made by a cylindrical surface.
ZG commonly known as Cone, the thread processing by a conical surface made ??of pipe joints in general are like this, Rc GB labeled with metric thread pitch to represent the United States and Britain screw threads per inch number to represent this is the biggest difference between them, metric thread is 60 degrees equilateral tooth type, inch thread is 55 degrees isosceles tooth type, US-made thread 60 degrees.