Coupling nut, also known as extension nut, is a threaded fastener for joining 2 male threads, most commonly threaded rods.

Coupling nut, also known as extension nut, is a threaded fastener for joining 2 male threads, most commonly threaded rods.

Coupling nut, also known as extension nut, is a threaded fastener for joining 2 male threads, most commonly threaded rods.

Coupling nut, also known as extension nut, is a threaded fastener for joining 2 male threads, most commonly threaded rods.

For easy joining of 2 threaded rods. Hexagon shape allows installation of the stud with a spanner.