3/4-10 Rod Coupling Nuts, Stainless Steel 18-8, Plain Finish, Quantity 10 Go to amazon.com Related posts Top 16 best coupling nuts 3/4 for 2022 FeatureThread Length 2"Thread Width 1"18-8 Stainless Steel provides strength and offers good corrosion resistance in many environments. DescriptionAcouplingnut also known as extension nut is a threaded fastener for joining two male threads, most commonly a threadedrod, but also pipes.