E-z Lok 303-624 Thread Locking Insert 3/8-24 Unf Stainless

Product Description

The E-Z LOK 303-624 is a self-lock wall thread locking insert designed to provide a secure, threaded connection in parent materials where thread integrity is critical. It features a 3/8-24 UNF internal thread and a 9/16-12 external thread, allowing it to be installed into a tapped hole while accepting a 3/8-24 fastener. The overall length is 33/64 inches (0.515 inches). Constructed from 303 stainless steel with a bright finish, this insert resists corrosion and withstands demanding service environments. It is installed by machinists, maintenance technicians, and mechanical contractors performing thread repair or thread reinforcement work on metal assemblies.

This insert is suited for applications requiring a reliable threaded anchor in metals, including structural components, equipment housings, and mechanical assemblies. The UNF thread standard makes it appropriate for fine-pitch fastener applications where precise thread engagement and resistance to loosening under vibration are priorities. The self-lock wall design grips the parent material to resist rotation during fastener installation and removal, making it well suited for high-cycle or high-vibration service conditions.

Key Features

• 3/8-24 UNF internal thread with 2B class of fit for standard fastener compatibility
• 9/16-12 external thread with 2A class of fit for installation into a standard tapped hole
• Self-lock wall design resists rotation and pull-out in the parent material
• 303 stainless steel construction provides corrosion resistance in wet or chemically exposed environments
• Bright finish with an overall length of 33/64 inches for compact thread reinforcement
• Compatible with standard tap type for straightforward hole preparation

Compatibility

Designed as an OEM-style threaded insert for use in metal parent materials requiring a 9/16-12 tapped hole and accepting a 3/8-24 UNF fastener. Install using a standard tap for hole preparation.

Installation Notes

Installation is performed by machinists or qualified mechanical technicians. The parent material must be tapped to 9/16-12 using a standard tap before insert installation. De-energize and lock out any equipment before performing thread repair or insert installation on live assemblies. Avoid cross-threading during installation, as damage to the external thread will compromise the locking function.