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Archived from the original on As the thread body is tapered 0. For rigidity; sealable only with sealant; sometimes male straight enclosed by female tapered for low-pressure sealing. The various types are each named with a symbol and a full name, as follows: [3]. Views Read Edit View history. In , William Sellers , the president of Franklin Institute , presented a standard for nuts, bolts, and screws. Thus the inside diameter of a given size of Schedule pipe differs from the Nominal Pipe Size, while outside diameters for a given nominal Schedule size are the same between Schedules.

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Newtown, CT: Taunton Press.

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National pipe thread

Out of this effort came the first United States Standard threads , including pipe threads. Because of the pipe wall thickness of Schedule pipe, the actual diameter of the NPT threads is larger than the Nominal Pipe Size outside diameter, and considerably so for small sizes. Views Read Edit View history.

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