Fastener SuperStore carries 61 sizes of coupling nuts in a wide variety of materials, diameters and lengths. Our selection includes standard and metric sizes and reducing coupling nuts.

Coupling nuts are used to attach two externally threaded fasteners together, such as bolts or threaded rod. The internal threads of the coupling nuts run through the entire body, allowing for adjustments in tension to be made.

Our standard coupling nuts come in regular and grade 5 steel with a zinc finish, and in 18-8 stainless steel. Diameter sizes range from 4-40 up to 1"-8, while lengths range from 7/16" up to 3"

We also carry metric sizes M5-0.8 and M6-1.0, with lengths of 15, 18 and 25 millimeters. Our metric versions come in 18-8 and 316 stainless steel.

We carry several sizes of reducing coupling nuts as well as some round metric versions.

Check out our coupling nuts selection here!