The tiniest innovations are sometimes the ones that save the most time and energy in the industrial world. Coupling nuts are just such innovations. Also known as extension nuts, they function as threaded fasteners, joining together two threaded rods by joining them in between.
The outsides of coupling nuts are usually hexes, allowing them to be easily adjusted with wrenches. Coupling nuts in and of themselves provide an essential workpiece, though variations have been introduced that make coupling nuts even more useful. Reducing coupling nuts, for example, join two threaded rods of different sizes. Sight hole coupling nuts have peek-holes allowing the user to observe the amount of engag