Electro Hardware EFH-440-10 Captive Stud 4-40 Thread

Product Description

The ELECTRO HARDWARE EFH-440-10 is a steel captive stud fastener designed to provide a fixed, non-removable threaded stud in sheet metal panels and thin-gauge assemblies. With a 4-40 thread size and an overall length of 0.625 inches, this stud installs into panels as thin as 0.04 inches minimum thickness. The head height measures 0.085 inches, keeping the installed profile low. The zinc-plated finish on C1005 to C1018 grade steel provides corrosion resistance suitable for indoor enclosures and control panels. Captive studs like this are installed by sheet metal fabricators, panel builders, and field technicians who need a permanent threaded point without access to the back side of the panel.

This captive stud is suited for use in electrical enclosures, HVAC control panels, junction boxes, and light-gauge sheet metal assemblies where a retained threaded fastener is required. The 4-40 thread is a standard machine screw size commonly found in small electrical components, terminal blocks, and control board mounting applications. The low panel thickness requirement of 0.04 inches makes this stud compatible with thin-gauge steel, aluminum, and similar sheet materials used in residential and commercial equipment enclosures. Sold in packages of 100 units.

Key Features

• 4-40 machine thread for compatibility with standard small-fastener hardware
• 0.625 inch overall length for use in compact panel assemblies
• Minimum panel thickness of 0.04 inches supports thin-gauge sheet metal applications
• Zinc-plated finish over C1005 to C1018 steel for corrosion resistance in indoor environments
• Low 0.085 inch head height minimizes installed profile inside enclosures
• Captive design provides a fixed threaded stud without requiring rear-panel access

Compatibility

Designed as an OEM-style captive stud replacement for thin-gauge steel panel assemblies requiring a 4-40 threaded retention fastener.

Installation Notes

Captive studs are typically installed by sheet metal fabricators or panel assembly technicians using a press or staking tool appropriate for the stud type. Power down any electrical enclosure completely before adding or replacing panel fasteners. Verify that the panel material thickness meets the 0.04 inch minimum requirement before installation to ensure proper retention. Follow applicable enclosure and panel fabrication standards for the equipment type being serviced.