- Coupling nuts are also known as extension nuts, which are threaded fasteners that are used to join two threaded rods
- These nuts feature a hexagonal exterior, which allows for secure tightening and loosening with an installation tool
- Coupling nuts are also available as reducing coupling nuts that have two different thread sizes and profiles
| Type | Rod Coupling Nut |
| Style | Regular Hex |
| Size | 5/16"-18 |
| Length | 1-3/4" |
| Material | Steel |
| Finish | Zinc |
| Grade | A |
| Thread | Coarse |
