E-z Lok 329-524 Thread Locking Insert 5/16-24 Unf

Product Description

The E-Z LOK 329-524 is a self-locking threaded insert designed to create a strong, vibration-resistant internal thread in metal assemblies. It features a 5/16-24 UNF internal thread and a 1/2-13 external thread, allowing it to be installed into a tapped hole and provide a reliable locking engagement for mating fasteners. Manufactured from C12L14 carbon steel with a smooth, rolled finish, the 329-524 measures 31/64 inches (0.484 inches) overall length. It is installed by machinists, maintenance technicians, and assembly professionals where thread locking without adhesives is required.

The 329-524 is suited for metal fabrication, mechanical assemblies, and maintenance repair operations where a self-locking thread form is needed without chemical thread-locking compounds. The self-lock wall design creates interference along the insert wall to resist rotation and back-out under vibration and dynamic loading. This insert fits a standard tapped hole and is appropriate for use in carbon steel and similarly hard substrate materials. Internal thread class of fit is 2B and external thread class of fit is 2A, consistent with standard UNF fastener tolerances.

Key Features

• 5/16-24 UNF internal thread with Class 2B fit for standard fastener engagement
• 1/2-13 external thread with Class 2A fit for installation into a standard tapped hole
• Self-lock wall design resists rotation and back-out under vibration without adhesives
• C12L14 carbon steel construction for strength and machinability
• 31/64 inches (0.484 inches) overall length for compact installation envelopes
• Smooth, rolled finish on external thread for consistent installation torque

Compatibility

Designed for installation into a standard tapped hole sized for a 1/2-13 external thread. Compatible with standard UNF fastener systems requiring a 5/16-24 internal thread. Use with a standard tap type for host material preparation.

Installation Notes

Installation is typically performed by machinists or assembly technicians using a standard tap to prepare the host material before driving the insert. Ensure the host material is fully de-energized or depressurized and secured before beginning thread preparation. Use the correct installation driver or tool recommended for self-lock wall inserts to avoid cross-threading or damage to the locking feature. Do not exceed the insert's designed thread engagement depth during installation.