E-z Lok 319-3 Thread Locking Insert 10-24 5/16-18 Unc

Product Description

The E-Z LOK 319-3 is a self-locking threaded insert designed to provide a secure, torque-resistant internal thread in metal assemblies. It features a 10-24 internal thread and a 5/16-18 external thread in UNC form, with an overall length of 0.312 inches. Manufactured from C12L14 carbon steel with a smooth, rolled finish, this insert is installed into a pre-tapped host material to create a locking thread engagement that resists vibration-induced loosening. It is suited for applications where standard free-running threads are not sufficient to maintain joint integrity under dynamic or cyclic loading.

This insert is appropriate for light- to medium-duty metal fastening applications in mechanical assemblies, equipment fabrication, and repair work. The self-lock wall design deforms slightly upon installation to grip the mating thread, eliminating the need for adhesives or secondary locking elements. It is compatible with standard UNC tap geometry, requiring no special tooling beyond a properly sized tap and driver. Typical use cases include machine frames, brackets, panels, and similar assemblies where thread stripping or loosening is a service concern.

Key Features

• 10-24 internal thread with 2B class of fit for standard UNC fastener engagement
• 5/16-18 external thread with 2A class of fit for installation into host material
• Self-lock wall design resists vibration loosening without adhesives
• C12L14 carbon steel construction with smooth, rolled finish
• Overall length of 0.312 inches suits thin-material applications
• Rated tensile strength of 3,464 pounds

Compatibility

Designed for installation into host materials tapped to a 5/16-18 UNC thread using a standard tap. Accepts 10-24 UNC fasteners with a 2B class of fit.

Installation Notes

Installation is typically performed by a machinist or assembly technician using a standard tap sized to the 5/16-18 external thread specification. Ensure the host material is properly clamped and the tap is run straight to avoid cross-threading before driving the insert. Power down any associated equipment and secure workpieces before beginning thread preparation. Do not exceed the rated tensile load of the insert when specifying fastener torque for the mating 10-24 screw.