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  2. North American Fire Hose Coupler Incompatibilities - Wikipedia

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

    1 + 12-inch hose with 1 + 12-11.5NPSH ASME threads instead of NFPA threads in the U.S. and Canada, without any regulation specifying its use, and contrary to NFPA 1963. [9] This is perhaps a direct result of the 1918 War Industries Board recommendation noted above, combined with 1 + 12 -inch 1.5-9 NH NFPA couplings not being ...

  3. Hose coupling - Wikipedia

    en.wikipedia.org/wiki/Hose_coupling

    Side view of a 1.5 to 2.5 inches (38 to 64 mm) adapter. National Hose thread (NH), also known as National Standard Thread (NST). It is the most common type of fire hose coupling used in the United States.

  4. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    The fitting is known as a reducing coupling, reducer, or adapter if their sizes differ. There are two types of collars: "regular" and "slip". A regular coupling has a small ridge or stops internally to prevent the over-insertion of a pipe and, thus, under-insertion of the other pipe segment (which would result in an unreliable connection).

  5. Railway coupling - Wikipedia

    en.wikipedia.org/wiki/Railway_coupling

    Scharfenberg coupler on a Southeastern Class 395 Video of ICE T coupling at Leipzig Hauptbahnhof. A coupling or coupler is a mechanism, typically located at each end of a rail vehicle, that connects them together to form a train.

  6. Coupling - Wikipedia

    en.wikipedia.org/wiki/Coupling

    In this coupling, the muff or sleeve is made into two halves parts of the cast iron and they are joined by means of mild steel studs or bolts. The advantages of this coupling is that assembling or disassembling of the coupling is possible without changing the position of the shaft. This coupling is used for heavy power transmission at moderate ...

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