Coupling Nuts

Coupling nuts, also known as extension nuts, are designed to join two male threads, typically threaded rods. These elongated hex nuts are essential for applications that require extending a threaded rod or connecting similar fasteners. Available in several grades of stainless steel and steel with a variety of finishes, coupling nuts provide varying levels of strength and corrosion resistance to cater a wide range of application needs. Stainless steel coupling nuts are particularly sought after for their corrosion resistance, while carbon steel nuts are valued for their strength and can be found with a corrosion-resistant finishes like zinc plated or hot-dipped galvanized.

The primary function of coupling nuts is to connect similar threaded parts, like threaded rods, by providing an elongated threaded shaft that is open on both sides. This is crucial in applications requiring the extension of threaded rods or the joining of similar parts. When selecting coupling nuts, it's important to consider the size, thread direction, and material. The size must be compatible with the rods used, and the thread direction can vary between right-hand and left-hand threading, with right-hand being more common. Additionally, the choice of material impacts the nut's strength, resistance to environmental factors, and appearance.

Standard coupling nuts like these require mating fasteners of the same diameter. Match the nut size to the diameter and thread size of the rods or pipes being joined.

Both types of nuts function the same: they both create an elongated connection between similar threaded fasteners. However, traditional coupling nuts connect fasteners of the same size, while reducing coupling nuts take a different-sized bolt or rod on either end.