Coupling nut

Coupling nut

A coupling nut is a threaded fastener for joining two male threads, most commonly threaded rod. The outside of the fastener is usually a hex so a wrench can hold it. 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.These are used to make up long rod assemblies from shorter lengths of rods. The rods are threaded into the coupling nut for a certain distance. Coupling nut dimensions are described by the industrial fastener institute in standard IFI-128.It is given a plain finish. It is either cold drawn or hot rolled depending on the bar stock used.Coupling nuts threaded with two different thread size and profile are called reducing coupling nuts. An optional hole called the sight hole is provided. This provides visual verification that the threads are engaged. [1]

References

  1. ^ Hex coupling nuts, archived from the original on 2010-02-04, http://www.webcitation.org/5nITaCGIC, retrieved 2010-02-04. 



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