Electro Hardware ES-0518-1 Round Head Clinch Nut 5/16-18

Product Description

The ELECTRO HARDWARE ES-0518-1 is a round head clinch captive nut designed to be permanently installed into sheet metal panels and enclosures. Once pressed into a punched mounting hole, the clinch nut displaces material in the host panel to create a flush, torque-resistant threaded anchor point. The 5/16-18 UNC thread accepts standard fasteners used throughout electrical enclosure, HVAC cabinet, and light structural assembly work. Made from zinc plated steel, the part resists corrosion in indoor and light-duty environments. The 0.5-inch head diameter and 0.413-inch mounting hole requirement make this a straightforward drop-in during fabrication or field repair of thin-gauge steel panels.

This clinch captive nut is suited for sheet metal assemblies where a permanent threaded insert is needed on panels as thin as 0.056 inches. Typical applications include electrical panel enclosures, HVAC equipment cabinets, control boxes, and light structural subassemblies where a weld nut or PEM-style fastener is needed without welding equipment. It is installed during fabrication or in the field by sheet metal workers, HVAC technicians, and electricians who need a reliable threaded anchor point in thin-gauge material.

Key Features

• 5/16-18 UNC thread for broad fastener compatibility across trade applications
• Clinch-style installation requires no welding and works with standard arbor or hydraulic press tooling
• Minimum panel thickness of 0.056 inches accommodates thin-gauge sheet metal enclosures
• Round head profile with 0.5-inch head diameter distributes clamp load across the panel surface
• Zinc plated steel construction provides corrosion resistance for indoor and protected environments
• Head height of 0.23 inches keeps the installed profile low in tight clearance assemblies

Compatibility

Designed as an OEM-style replacement or new-installation clinch captive nut for sheet metal panels and enclosures requiring a 5/16-18 threaded insert with a 0.413-inch mounting hole diameter and a minimum panel thickness of 0.056 inches.

Installation Notes

Installation requires a properly sized punch or drill to produce a 0.413-inch mounting hole before pressing the nut into the panel. A bench press, arbor press, or hydraulic press with the correct anvil is the standard tool for clinching; do not attempt to install by hammer strike, as this can deform the head or damage the thread. Verify that the host panel meets the 0.056-inch minimum thickness specification before pressing to ensure adequate material displacement and pull-out resistance. Disconnect and de-energize any panel or enclosure before performing fastener installation work on live equipment.