New standard, how can the pipe joint be labeled, such as "3/4" taper pipe thread?
The English system is 55 degrees of thread, and the internal thread of taper pipe is Rc3/4. The outer thread is R3/4The U.S. is 60 degrees
60 degrees taper pipe thread: NPT3/4"55 "taper pipe threads: external thread -R3/4", internal thread -Rc3/4"
Pipe fittings 3/4 refers to the pipe fittings of six points (6 British points), DN (diameter) of 20mm, the outer diameter of 26.8mm.Supplement:1 inches =25.4 mm, =8 British points, 1/2 is four points (4 British points), DN diameter 15mm, 3/4 is six points (6 points), DN20mm.
