Gibraltar 41502G Coupling Nut 5/16-18 Unc Steel

Product Description

The GIBRALTAR 41502G is a standard coupling nut designed to join two externally threaded fasteners along a common axis. Made from 1117-grade steel with a black oxide coating, this nut provides moderate corrosion resistance and a clean finished appearance. It features a 5/16-18 UNC right-hand thread and measures 7/8 inches in overall length with a width across flats of 9/16 inches. Coupling nuts of this type are commonly installed by electricians, plumbers, HVAC technicians, and general maintenance trades when extending threaded rod or connecting two bolts end to end in structural or mechanical assemblies.

This coupling nut suits light-duty to medium-duty fastening applications in residential and commercial construction, equipment mounting, and mechanical assemblies where threaded rod extensions are required. The 5/16-18 UNC thread is a standard unified coarse pitch widely used across trade and industrial applications in North America. Its compact 7/8-inch length makes it well suited for tight-clearance installations where a full hex nut stack is not practical.

Key Features

• 1117-grade steel construction for reliable strength in standard fastening applications
• Black oxide coating provides mild corrosion resistance and reduces light reflectivity
• 5/16-18 UNC right-hand thread matches widely available threaded rod and bolt stock
• 7/8-inch overall length with 9/16-inch width across flats for standard wrench engagement
• Meets TCMAI standards for dimensional consistency

Compatibility

Designed as an OEM-style replacement or direct-use coupling nut for applications requiring a 5/16-18 UNC right-hand thread standard coupling nut in steel construction.

Installation Notes

Installation is performed by hand-threading onto matching 5/16-18 UNC threaded rod or bolt ends, then tightening with a standard 9/16-inch wrench or socket. Ensure both mating threads are clean and free of debris before assembly. Do not cross-thread or over-torque, as 1117-grade steel is optimized for machinability rather than maximum tensile strength. Follow applicable mechanical or structural codes for the specific installation environment.