Threaded pipe fittings and valve markings
Thread Content
What does SPF mean on standard American thread pipe fittings marked on the outside? There are also American standard threaded valves; what do the markings 125G 5G1/2G mean?
1. “SPF” is the code for American-standard threaded pipe fittings, indicating that these fittings comply with American standards and have specific specifications and dimensions. Specifically, “S” stands for threaded connection, “P” stands for pipe connection, and “F” stands for female thread (that is, the port for connecting to an external thread). 2. “125G 5G1/2G” is the designation for standard American thread valves, where “125” indicates the valve’s rated pressure in psi ； “G” indicates the type of threaded connection; in this case, it is an NPT thread ； “5” indicates the size of the valve, in inches ； “1/2” indicates the thread size of the valve, in inches. Therefore, this valve means: the rated pressure is 125 psi, it uses NPT thread connections, the valve size is 5 inches, and the thread size is 1/2 inch. .