Coupling nut is a threaded fastener that is used for joining two male threaded members. It is most commonly used in the threaded rod or stud. The outer shape of this nut is generally hexagonal so that the wrench can hold it perfectly while fastening. Variations include reducing coupling nuts, for joining two different size threads; sight hole coupling nuts, which have a sight hole for observing the amount of engagement; and coupling nuts with left-handed threads.

Coupling nuts are used to make long assemblies of relatively short rods. It is either cold drawn or hot rolled depending on the bar stock used. Coupling nuts threaded with two different thread sizes and profiles are called reducing coupling nuts.

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