E-z Lok HI-004-WH 4-40 Unc Brass Threaded Insert 100 Pack

Product Description

The E-Z LOK HI-004-WH is an unheaded, heat-installed threaded insert designed to create durable internal threads in thermoplastic and other heat-receptive materials. Manufactured from brass, this insert measures 0.181 inches in outer diameter and 0.226 inches in overall length. It accepts a 4-40 UNC thread and requires a 0.157-inch installation hole. Heat is applied during installation to allow the insert to flow into the surrounding material, forming a strong mechanical bond without adhesives. Maintenance technicians, electronics assemblers, and industrial fabricators commonly install these inserts when plastic components require reliable metal threading for repeated fastener engagement.

This insert is suited for use in low-load plastic assemblies, enclosures, printed circuit board standoffs, and light-duty fixtures where a 4-40 UNC threaded connection is required. The unheaded design keeps the installed insert flush with or below the surface of the host material, making it well-suited for applications where a protruding collar is not acceptable. A minimum wall thickness of 0.063 inches is required in the host material to ensure a sound installation. Each package contains 100 inserts.

Key Features

• Brass construction provides corrosion resistance and reliable thread engagement
• Unheaded design installs flush with the host material surface
• 4-40 UNC internal thread for compatibility with standard fasteners
• Heat-installation method creates a strong mechanical bond in thermoplastics
• 0.181-inch insert diameter and 0.226-inch overall length for compact fitment
• Packaged in quantities of 100 to support production and batch repair work

Compatibility

Designed as an OEM-style heat-installed insert for thermoplastic components requiring a 4-40 UNC internal thread with a 0.157-inch installation hole and a minimum host wall thickness of 0.063 inches.

Installation Notes

Installation is performed with a soldering iron or thermal press set to a temperature appropriate for the host plastic - consult the plastic manufacturer's data sheet for recommended processing temperature. Press the insert into the pre-drilled or molded pilot hole with steady, even pressure until the insert sits flush or below the surface. Allow the material to cool completely before applying thread load. Do not exceed the minimum wall thickness requirement, as insufficient surrounding material will result in pull-out failure.