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2. Coupling nut - Wikipedia

   en.wikipedia.org/wiki/Coupling_nut

   A coupling nut A coupling nut and its orthographic view. A coupling nut, also known as extension nut, is a threaded fastener for joining two male threads, most commonly a threaded rod, [1] [2] but also pipes. [3] The outside of the fastener is usually hexagonal so a wrench can hold it.

3. 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.

4. Blind mate connector - Wikipedia

   en.wikipedia.org/wiki/Blind_mate_connector

   Electrical blind mate connectors provide power or signal and are distinguished from other connectors in that they do not feature a rigid mechanical retention mechanism belonging to the interface itself, such as a threaded coupling nut on an SMA connector.

5. Nut (hardware) - Wikipedia

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

   A (usually square) nut in a spring steel cage which wraps around the nut. The cage has two wings that when compressed allow the cage to be inserted into the square holes Clip-on nut: J-nut or U-nut, sheet metal nut, speed nut (ambiguously) Designed to be clipped to sheet metal Coupling nut: Extension nut

6. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   Threaded pipe and elbow.The pipe has a male NPT thread, while the elbow is female.. American National Standard Pipe Thread standards, often called national pipe thread standards for short, are United States national technical standards for screw threads used on threaded pipes and pipe fittings.

7. Coupling (piping) - Wikipedia

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

   Pipe coupling (copper sweat) In piping and plumbing , a coupling (or coupler ) is a very short length of pipe or tube , with a socket at one or both ends that allows two pipes or tubes to be joined, welded ( steel ), brazed or soldered ( copper , brass etc.) together.