Gibraltar 41505G Coupling Nut 1/2-13 Unc Steel Black Oxide

Product Description

The GIBRALTAR 41505G is a standard coupling nut designed to join two externally threaded fasteners along a common axis. Manufactured from 1117 steel with a black oxide coating, this hex coupling nut handles thread engagement for rod extensions, all-thread connections, and similar mechanical assemblies. It carries a 1/2-13 UNC thread specification, an overall length of 1.25 inches, and a width across flats of 0.875 inches. The black oxide finish provides mild corrosion resistance and reduces light glare on exposed fastener hardware. Installation requires no special tools beyond a standard wrench or socket matching the 0.875-inch flat-to-flat dimension.

This coupling nut is suited for general mechanical, structural, and maintenance applications where two threaded rods or studs must be joined end to end. Typical uses include threaded rod extensions in HVAC equipment supports, plumbing pipe hanger assemblies, electrical strut channel systems, and general fabrication work. The right-hand thread orientation is standard for the vast majority of fastener applications in these trades. At 0.18 pounds, the part is light enough for single-hand positioning during assembly.

Key Features

• 1/2-13 UNC right-hand thread for compatibility with standard unified coarse thread fasteners
• 1117 steel construction provides good machinability and adequate tensile strength for coupling applications
• Black oxide coating offers mild corrosion resistance and a low-reflectance finish
• 1.25-inch overall length gives sufficient thread engagement for secure rod-to-rod connections
• 0.875-inch width across flats fits standard 7/8-inch wrenches and sockets
• Meets TCMAI standards for threaded fastener manufacturing

Compatibility

Designed as a standard 1/2-13 UNC coupling nut for use wherever two right-hand threaded rods, studs, or bolts of matching thread specification require joining.

Installation Notes

A licensed mechanic, maintenance technician, or qualified tradesperson should verify load ratings before using coupling nuts in structural or overhead suspension applications. Engage both threaded ends to the full depth of the nut and inspect threads for damage before torquing. Do not use impact tools at full power without confirming the rod and nut material grades can handle the resulting stress. Follow applicable codes such as ASME or local structural guidelines when used in load-bearing assemblies.