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2. Coupling nut - Wikipedia

   en.wikipedia.org/wiki/Coupling_nut

   Coupling nuts can be used to tighten a rod assembly inward or to press a rod assembly outward. [4] [5] Along with bolts or studs, coupling nuts are also often used to make homemade bearing and seal pullers/presses. The advantage of a connecting nut over a standard nut in this application is that, due to its length, a greater number of threads ...

3. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Coupling nut: Extension nut A threaded fastener for joining two male threads, most commonly a threaded rod,[1][2] but also pipes ... #3: 3 ⁄ 16: 0.1875 4.763 5.10 1 ...

4. 4.3-10 connector - Wikipedia

   en.wikipedia.org/wiki/4.3-10_connector

   While 7/16 uses an axial O-ring gasket, which needs to be compressed by applying high torque to the coupling nut to make reliable electrical contact between the outer and inner conductors, 4.3-10 uses a radially loaded O-ring, set into a groove in the outer conductor of the male plug. [4]

5. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   In contrast to a coupling requiring solvent welding, soldering, or rotation (for threaded couplings), a union allows easy connection and disconnection multiple times if needed. It consists of three parts: a nut, a female, and a male end. When the female and male ends are joined, the nut seals the joint by pressing the two ends tightly together.

6. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   ANSI B1.20.3-1976 (R2013) Dryseal Pipe Threads (Inch) Pipe Thread Form ASME B1.20.7-1991 (R2013) Hose Coupling Screw Threads - Inch: Pipe Thread Form ASME B1.21M-1997 (R2013) Metric Screw Threads - MJ Profile: V Thread Form BS 84: Tables of BS Whitworth, BS Fine and BS Pipe Threads: V Thread Form (55°) 1 ⁄ 4 ″-20 BSW ISO 68-1:1998

7. Coupling (piping) - Wikipedia

   en.wikipedia.org/wiki/Coupling_(piping)

   A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling. An example is a 3/4" NPT to 1/2" NPT coupling.