Gibraltar 41509G Coupling Nut 1-8 Unc Steel Black Oxide

Product Description

The GIBRALTAR 41509G is a heavy-duty coupling nut used to join two threaded rods or extend the reach of a single threaded rod in structural and mechanical fastening applications. Machined from 1117 steel and finished with a black oxide coating for mild corrosion resistance, this coupling nut features a 1-8 UNC right-hand thread and measures 2.5 inches overall length. The 1-5/8-inch width across flats accommodates standard wrenching with common hand and power tools. It meets TCMAI standards and is suited for contractors, millwrights, and maintenance technicians who need a reliable, code-compliant fastening solution in steel construction or equipment assembly work.

This coupling nut is used in residential and commercial construction, industrial equipment assembly, and mechanical contracting where threaded rod connections are required. Typical applications include all-thread rod splicing for hanger rod assemblies, pipe supports, structural bracing, and similar trade installations. The black oxide finish provides a degree of protection in interior or low-moisture environments. It ships in single-unit quantities, making it a practical add-on for service and repair jobs requiring just one replacement or additional connector.

Key Features

• 1-8 UNC right-hand thread for compatibility with standard unified coarse-thread rod stock
• 2.5-inch overall length provides adequate thread engagement for load-bearing rod joints
• 1117 steel construction offers good machinability and solid mechanical strength
• Black oxide coating delivers mild surface protection and reduces light reflection
• 1-5/8-inch width across flats fits standard open-end and box wrenches
• Meets TCMAI standards for dimensional compliance

Compatibility

Designed as a standard coupling nut for use with 1-inch diameter, 1-8 UNC threaded rod in unified coarse-thread fastening assemblies.

Installation Notes

Installation is performed by qualified mechanics, millwrights, pipefitters, or general contractors working with threaded rod assemblies. Ensure both mating rods are the same thread standard and pitch before engaging the nut. Use an appropriately sized wrench on the hex flats and tighten to the project specification or applicable structural standard. Inspect threads on both the rod and coupling nut for damage or contamination before assembly.