For workers, instead of these distances, it is more convenient to know how many turns to make by hand and how many with a wrench. It also specifies another distance, the engagement, the distance the pipe can be screwed in by hand, without much effort. The standard specifies this distance, the effective thread. The taper is ¹⁄₁₆ inch in an inch, which is the same as ¾ inch in a foot.īecause of the taper, a pipe can only screw into a fitting a certain distance before it jams, unlike threading a nut on a bolt. The bottoms of the threads aren't on a cylinder, but a cone they taper. To accomplish this, the threads become shallower the farther they are from the end of the pipe or fitting. Many pipe threads must make not only a mechanical joint but also a leakproof one. The word “taper” in several of these names points to the big difference between many pipe threads and those on bolts and screws. In the United States, the pipe thread standards are: NPTĪmerican Standard Straight Coupling Pipe ThreadĪmerican Standard Taper Railing Pipe ThreadĪmerican Standard Straight Mechanical Pipe ThreadĪmerican Standard Straight Locknut Pipe Thread If “LH” is added, the pipe has a left hand thread. For example, “½–14 NPT” identifies a pipe thread with a nominal inside diameter of ½ inch and 14 threads to the inch, made according to the NPT standard. Pipe thread sizes are described much as bolt sizes are, although the shapes are different. ☙ Share this page on Facebook American pipe threads
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