Electro Hardware EWNS-440-0 4-40 Round Head Weld Nut 303 Ss

Product Description

The ELECTRO HARDWARE EWNS-440-0 is a 4-40 threaded round head weld nut manufactured from Grade 303 stainless steel with a passivated finish. Designed for permanent attachment to sheet metal panels, this weld nut features three projections that concentrate resistance-welding current for a consistent, secure weld. The body diameter measures 0.31 inches, the pilot height is 0.063 inches, and the minimum panel thickness required for proper installation is 0.03 inches. Mechanical assemblers, fabricators, and maintenance technicians working with stainless steel assemblies install this nut where a fixed, corrosion-resistant threaded insert is needed without access to the back side of the panel.

This weld nut is suited for light-gauge sheet metal applications where a 4-40 threaded connection must be permanently embedded into the workpiece. Common uses include electrical enclosures, HVAC equipment panels, plumbing fixture brackets, and similar thin-panel assemblies requiring a flush or low-profile fastening point. The passivated Grade 303 stainless steel construction provides corrosion resistance in mildly harsh or moisture-exposed environments. Each package contains 25 pieces, making it practical for production runs or service stock replenishment.

Key Features

• 4-40 internal thread in inch measurement system for compatibility with standard 4-40 fasteners
• Three-projection design concentrates weld current for consistent resistance-welding results
• Grade 303 stainless steel construction provides corrosion resistance and machinability
• Passivated finish enhances surface corrosion resistance on the stainless base material
• 0.031 inch body diameter and 0.063 inch pilot height suit thin-panel sheet metal work
• Sold in a package of 25 pieces with a minimum order quantity of 1 package

Compatibility

Designed as an OEM-style weld nut for thin sheet metal panels with a minimum thickness of 0.03 inches and a pilot hole diameter of 0.173 inches, accepting standard 4-40 machine screws in inch-measurement assemblies.

Installation Notes

Installation requires a resistance spot welder capable of handling the three-projection profile; a fabricator or sheet metal technician should verify welder settings against the panel material and thickness before production welding. Ensure the pilot hole diameter in the panel measures 0.173 inches for proper nut alignment and projection seating prior to welding. Power down any associated electrical assembly before adding or replacing fastener hardware in energized enclosures. Follow applicable ANSI and AWS resistance welding standards for projection weld procedures.