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  2. North American Fire Hose Coupler Incompatibilities - Wikipedia

    en.wikipedia.org/wiki/North_American_Fire_Hose...

    Note: the straight iron pipe thread is a temporary connection and seals with a gasket, just like garden hose threads and fire hose threads, and is distinct from tapered iron pipe thread (NPT), which is a permanent connection sealed by the threads in conjunction with pipe dope or teflon tape wrapped around the threads.

  3. National pipe thread - Wikipedia

    en.wikipedia.org/wiki/National_pipe_thread

    National Pipe Taper Fuel (NPTF, also called Dryseal American National Standard Taper Pipe Thread, defined by ASME B1.20.3) is designed to provide a more leak-free seal without the use of PTFE tape (often referred to by the popular brand name "Teflon") or another sealant compound. NPTF threads have the same basic shape but with crest and root ...

  4. Talk:National pipe thread - Wikipedia

    en.wikipedia.org/wiki/Talk:National_pipe_thread

    Stephen Charles Thompson 17:57, 30 December 2008 (UTC) NPT is the acronym for national pipe taper which is 3/4"/ft. NPTF is the acronym for national pipe taper fuel. The threads are the same basic dimension as NPT, but minor differences allow the threads to "bottom out" diametrically which creates a dry fit seal without using any sealing ...

  5. Threaded pipe - Wikipedia

    en.wikipedia.org/wiki/Threaded_pipe

    The threaded pipes used in some plumbing installations for the delivery of gases or liquids under pressure have a tapered thread that is slightly conical (in contrast to the parallel sided cylindrical section commonly found on bolts and leadscrews).

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  7. O-ring boss seal - Wikipedia

    en.wikipedia.org/wiki/O-ring_boss_seal

    Most threaded systems, such as NPT, have a seal provided by a taper in the thread, so it is difficult to orient both ends of the hose, pipe or tube so that it is not twisted. In the o-ring boss system, this problem is eliminated because the threads do not seal the connection and therefore can be rotated at least a full revolution before they ...

  8. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    Standardization of screw threads has evolved since the early nineteenth century to facilitate compatibility between different manufacturers and users. The standardization process is still ongoing; in particular there are still (otherwise identical) competing metric and inch-sized thread standards widely used. [ 9 ]

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