ASME B18.2.2 provides the engineering specifications for Hexagon Coupling Nuts (Inch Series). These elongated fasteners are specifically designed to join two imperial-threaded components, such as a bolt, threaded rod, or machine screw, serving as a robust extension interface within a structured fastening system.

The ASME B18.2.2 Coupling Nut features a significantly greater height than standard hex nuts, ensuring ample thread engagement to handle full tensile loads of the connected rods. This standard is critical for North American infrastructure, mechanical piping, and suspended ceiling systems. By providing a secure internal bridge, it maintains the structural continuity of the screw thread assembly across extended spans.

The technical focus of ASME B18.2.2 Coupling Nuts is Axial Load Transfer and Thread Continuity. The length of the nut is designed to ensure that the internal threads do not strip under the rated tension of the imperial bolt or rod. When a machine screw or rod is threaded into the coupling, the uniform hex exterior allows for precise torque application, ensuring a rigid connection that resists loosening under operational stress.