Gibraltar 41606G Flange Nut 5/8-11 12L14 Steel Black Oxide

Product Description

The GIBRALTAR 41606G is a heavy-duty flange nut designed for securing bolted assemblies where a wide bearing surface is needed to distribute clamping load. Machined from 12L14 carbon steel and finished with a black oxide coating for corrosion resistance, this nut meets TCMAI fastener standards. It features a 5/8-11 thread size, a flange diameter of 1-3/8 inches, an overall height of 13/16 inches, and a width across flats of 1-1/16 inches. The integrated flange eliminates the need for a separate washer, making it a practical choice for structural and mechanical assembly work.

This flange nut is suited for general industrial, mechanical, and trade assembly applications where inch-series fasteners are specified. It is appropriate for use in HVAC equipment mounting, plumbing support brackets, electrical panel framing, and similar trade installations that call for a reliable, standard-threaded nut with a built-in bearing flange. Installation is performed by hand or with a standard wrench sized to the 1-1/16 inch across-flats dimension.

Key Features

• 5/8-11 UNC thread for compatibility with standard inch-series bolts and studs
• 1-3/8 inch flange diameter distributes clamping load without a separate washer
• 12L14 steel construction provides good machinability and consistent thread engagement
• Black oxide finish offers mild corrosion resistance in dry or low-moisture environments
• Meets TCMAI fastener standards for dimensional accuracy
• Flange height of 3/16 inches keeps the bearing surface low-profile for tight clearance applications

Compatibility

Designed as an OEM-style replacement or standard replacement flange nut for inch-series mechanical and structural assemblies requiring a 5/8-11 threaded fastener with an integrated flange.

Installation Notes

Install using a standard open-end or box wrench sized to 1-1/16 inches across flats. De-energize and lock out all equipment before fastener work on live mechanical or electrical assemblies. Confirm thread engagement is clean and free of debris before torquing. Black oxide finish is not rated for outdoor or high-moisture exposure without additional corrosion protection.