Electro Hardware EF-0420-4 Flush Mount Captive Nut 1/4-20

Product Description

The ELECTRO HARDWARE EF-0420-4 is a flush mount captive nut designed for secure, panel-level fastening in metal fabrication, enclosure assembly, and light structural applications. Featuring a 1/4-20 thread size and a hex head profile, this captive nut installs flush with the panel surface to eliminate protruding hardware. The body is fabricated from 18-8 stainless steel with a passivated finish, providing corrosion resistance suitable for demanding environments. Each package contains 10 pieces, making this a practical replenishment unit for shop stock or field kits used by HVAC technicians, electricians, and panel fabricators who require reliable threaded inserts in thin sheet metal applications.

This captive nut is suited for use in electrical enclosures, control panels, HVAC equipment housings, and similar sheet metal assemblies where minimum panel thickness is 0.187 inches. The 0.386-inch mounting hole diameter and 0.4375-inch head diameter allow straightforward installation into pre-punched or drilled panel stock. The flush head design keeps surfaces clean and avoids interference with mating components or cover panels. Typical users include HVAC service technicians, electrical panel builders, and mechanical assemblers working with light-gauge stainless or steel enclosures.

Key Features

• 1/4-20 thread size for standard fastener compatibility
• Hex head profile provides positive engagement and resistance to rotation during assembly
• Flush mount design sits level with the panel surface, minimizing hardware protrusion
• 18-8 stainless steel construction with passivated finish for corrosion resistance
• Minimum panel thickness of 0.187 inches suits common light-gauge sheet metal applications
• Sold in a 10-piece package for efficient shop or field restocking

Compatibility

Designed as a flush mount captive nut replacement or new-installation fastener for sheet metal panels and enclosures with a minimum thickness of 0.187 inches and a mounting hole diameter of 0.386 inches accepting 1/4-20 threaded fasteners.

Installation Notes

Installation is typically performed by mechanical assemblers, HVAC technicians, or electricians during enclosure fabrication or field service. Ensure the panel hole is punched or drilled to the correct 0.386-inch mounting hole diameter before pressing or setting the nut. Deburr the mounting hole prior to installation to ensure a flush, secure seat. Follow applicable fastener and enclosure assembly standards for the specific equipment being serviced.