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== Fitting Examples ===== 1/2" Pipe Thread ===Also called: 1/2" NTP. National Pipe Thread Tapered Thread. This type of pipe thread is tapered so that the fit tightens as the pipe is twisted in. == American Tapered Pipe Threads NTP ==Two of the more popular thread forms used are the Dryseal American Standard Taper Pipe Thread (NPTF) and American Standard Straight Pipe Thread for Mechanical Joints (NPSM). Pipe thread sizes are described much as bolt sizes are. Pipe threads must make a mechanical joint and leakproof connection. To accomplish this, the threads become shallower the farther they are from the end of the pipe. The bottoms of the threads aren't on a cylinder, but a cone. The cone taper is 1/16" in 1", which is the same as 3/4" inch in 1'. American Standard Taper Pipe Threads (NPT) is defined by ANSI/ASME standard B1.20.1.