Electro Hardware EFH-440-4 Captive Stud 4-40 Thread 100pk

Product Description

The ELECTRO HARDWARE EFH-440-4 is a steel captive stud designed for secure panel fastening applications in light fabrication, enclosure assembly, and equipment manufacturing. Featuring a 4-40 thread size and an overall length (OAL) of 0.25 inches, this stud is engineered for use with thin panels, accommodating a minimum panel thickness of 0.04 inches. The zinc-plated finish over C1005 to C1018 grade steel provides corrosion resistance suited to indoor industrial and commercial environments. The 0.085-inch head height keeps the profile low while maintaining a reliable captive hold. Each package contains 100 units, making it practical for production-volume installations and service stock.

The EFH-440-4 captive stud is used in panel assembly, electronic enclosures, switchgear, and light sheet metal fabrication where a permanently retained fastener is required. Its small 4-40 thread makes it appropriate for compact enclosure panels, instrument housings, and control box assemblies common in electrical, HVAC controls, and light industrial equipment. The thin minimum panel thickness rating allows use with lightweight gauge sheet metal or formed panels without compromising thread engagement or fastener retention.

Key Features

• 4-40 thread size for fine-pitch fastening in compact panel applications
• 0.25 inches overall length suited to thin-panel assemblies
• Minimum panel thickness of 0.04 inches allows use with lightweight sheet metal
• C1005 to C1018 grade steel construction for consistent mechanical strength
• Zinc-plated finish provides corrosion resistance in indoor environments
• Sold in packs of 100 for production and service inventory use

Compatibility

Designed as a captive fastener replacement for panel and enclosure assemblies requiring a 4-40 thread captive stud with a minimum panel thickness of 0.04 inches and a 0.25-inch OAL.

Installation Notes

Captive studs of this type are typically installed by mechanical assemblers or electricians during panel fabrication or enclosure build-out. Ensure the panel material thickness meets the 0.04-inch minimum before installation to maintain proper thread engagement and captive retention. De-energize any electrical enclosure fully before servicing or replacing fasteners inside live panels. Standard hand tools appropriate for 4-40 thread hardware are sufficient for installation.