The Coupling Nut is a versatile fastener widely recognized for its unique design and extensive applications across various industries. 

 In terms of appearance, the Coupling Nut features a cylindrical shape with internal threads on both ends. This enables it to join two threaded rods or studs, providing a secure and adjustable connection. Its external surface is typically hexagonal, allowing for easy installation and tightening. 

The Coupling Nut finds widespread use in industries such as construction, plumbing, electrical, and manufacturing. It is commonly employed to extend or join threaded rods, aligning and connecting components in assemblies, frameworks, and structural applications.