Gibraltar 41503G Coupling Nut 3/8-16 Unc Steel

Product Description

The GIBRALTAR 41503G is a standard coupling nut designed to join two externally threaded fasteners along a common axis. Manufactured from 1117-grade steel with a black oxide coating, it provides moderate corrosion resistance in protected indoor environments. The nut features a 3/8-16 UNC right-hand thread and measures 1 inch overall length with an 11/16-inch width across flats. It is used by mechanical contractors, HVAC installers, plumbers, and electricians wherever a threaded rod extension or two-bolt connection is required in structural or equipment-mounting applications.

This coupling nut is suited for general fastening tasks in residential and light commercial construction. Typical applications include threaded rod extensions for pipe hangers, equipment supports, electrical conduit strut assemblies, and HVAC equipment mounting frames. The 3/8-16 UNC thread form is one of the most common inch-series thread sizes in North American mechanical and construction trades, making this nut a standard shop and service-truck staple.

Key Features

• 3/8-16 UNC right-hand thread for compatibility with standard inch-series threaded rod and fasteners
• 1117-grade steel construction provides reliable strength for general-duty fastening
• Black oxide coating offers mild corrosion resistance in dry or indoor conditions
• 1 inch overall length suits standard coupling and rod-extension tasks
• 11/16-inch width across flats fits standard open-end and box wrenches
• Meets TCMAI standards for dimensional consistency

Compatibility

Designed as a standard 3/8-16 UNC coupling nut compatible with any inch-series threaded rod, stud, or bolt conforming to UNC thread standards in that size.

Installation Notes

Installation requires an open-end or box wrench sized to 11/16 inches; a torque wrench is recommended for structural or load-bearing applications per the applicable mechanical or building code. De-energize and lock out any electrical equipment before working in enclosures or panels where this fastener is used. Black oxide coating is not a substitute for plated or stainless hardware in wet, outdoor, or corrosive environments. Follow applicable codes including NEC or IPC as relevant to the assembly being fastened.