Exterior North America, some US pipe threads are discovered, in addition to many British Customary Pipe threads and ISO 7-1, 7-2, 228-1, and 228-2 threads.
Contents
Varieties[edit]
The varied varieties are every named with a logo and a full identify, as follows:[3]
Use[edit]
Generally used sizes are 1⁄8, 1⁄4, 3⁄8, 1⁄2, 3⁄4, 1, 1+1⁄4, 1+1⁄2, 2, 2+1⁄2, 3, 4, 5, and 6 inch, as pipe and fittings by most U.S. suppliers. Sizes smaller than 1⁄8 inch are often used for compressed air, whereas sizes bigger than 6 inches are sometimes joined by different strategies.
Specs[edit]
Nationwide Pipe Taper Gasoline (NPTF), additionally referred to as Dryseal American Nationwide Customary Taper Pipe Thread, outlined by ASME B1.20.3, is designed to offer a extra leak-free seal with out using PTFE tape (usually referred to by the favored model identify (*1*)) or one other sealant compound. NPTF threads have the identical primary form however with crest and root heights adjusted for an interference match, eliminating the spiral leakage path.
Customary sizes[edit]
Historical past[edit]
In 1864, William Sellers, the president of Franklin Institute, offered a normal for nuts, bolts, and screws. Out of this effort got here the primary United States Customary threads, together with pipe threads.[9] (See additionally Screw thread § Historical past of standardization.)