National Hardware 5/16-18 in. x 1 in. Coupling Nut

The National Hardware 5/16-18 in. x 1 in. Coupling Nut is designed to securely join and extend two pieces of threaded rod in construction and hardware applications. Featuring a durable steel body with a protective zinc-plated finish, this coupler delivers dependable strength and corrosion resistance for both indoor and outdoor projects. Engineered with standard coarse threading, this coupling nut ensures smooth engagement and reliable alignment across demanding installations. It provides a strong, unified connection that maintains structural integrity in a wide range of hanging, mounting, and fastening setups.