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Coupling nuts are threaded metal fasteners used to secure two parts together. They can be made from various materials, but metal is most common. The nuts work through interlocking grooves and come in different lengths, finishes, and shapes, including cap nuts and acorn nuts. Some coupling nuts have a sight hole for visual inspection of the threads.
A coupling nut is typically a metal fastener that is internally threaded. It is designed to secure two parts together by screwing the coupling nut into the outside of another part, often a threaded rod. The outside of a coupling nut is usually hex-shaped so that a wrench can tighten or loosen it.
Coupling nuts can be made from any material, but the most common coupling nuts are metal due to the strength of the material and the variety of applications it can be used in. Metal Coupling Nuts can be made from stainless steel, carbon steel, brass, or aluminum. In much rarer situations, they can be made from PVC or similar materials.
This type of nut works through the use of threads, or grooves, in the metal. A continuous male groove runs along the inside of the nut. In addition, a continuous male groove runs along the outside of the part to be fastened. When these male splines meet, they interlock, creating a secure connection that can be tightened by hand or tool. This mechanism of using grooves to fix parts is called threading.
There are many variations for a standard coupling nut. First, nut length can vary from less than one inch (0254 m) to 14 inches (3556 m) or even longer in special applications. Secondly, the finish of the coupling nut can vary. They can be smooth or galvanized, plated with other material, dyed or coated.
Finally, the shape and appearance of the nut can vary greatly. Most coupling nuts have a hex shape on the outside so a wrench can be used, and most are open center at the top and bottom to allow a rod to pass through the nut. A cap nut is different in that the top of the nut has a dome over the opening. This is used for the end of a coupling rod. An acorn nut is similar to a cap nut, but the dome is shaped more like a cone than a dome. In all of these cases, the outside of the nut is hexagonal in shape, but another standard coupling nut is square in shape on the outside.
Another type of coupling nut contains something called a sight hole. This is a hole on the outside of the nut that goes through all the material. A sight hole in the nut allows for visual inspection of the threads within, allowing you to verify that the threads are properly engaged.
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