E-z Lok 329-5 Thread Locking Insert 5/16-18 Unc Carbon Steel

Product Description

The E-Z LOK 329-5 is a self-lock wall thread locking insert designed to create strong, reliable threaded connections in parent materials that require a secure, vibration-resistant fastening point. It features a 5/16-18 internal thread and a 1/2-13 external thread, both conforming to UNC standards. Manufactured from C12L14 carbon steel with a smooth, rolled finish, this insert delivers a tensile strength of 10,301 pounds. The overall length is 31/64 inches (0.484 inches). It is installed by threading technicians, maintenance mechanics, and assembly professionals working in metal fabrication, industrial equipment repair, and general mechanical assembly applications.

This insert is suited for applications where a tapped hole must accept a 5/16-18 fastener while threading into a 1/2-13 prepared bore. The self-lock wall design provides resistance to loosening under vibration and dynamic loading conditions. It is commonly used in repair and original-equipment manufacturing scenarios where thread size conversion or thread reinforcement is required in carbon steel, aluminum, or other structural substrates.

Key Features

• 5/16-18 internal thread with Class 2B fit for standard bolt engagement
• 1/2-13 external thread with Class 2A fit for installation into a prepared bore
• Self-lock wall design resists loosening under vibration and dynamic loads
• C12L14 carbon steel construction with smooth, rolled finish
• Tensile strength rated at 10,301 pounds
• UNC thread standard - compatible with standard taps

Compatibility

Designed as an OEM-style or repair-grade thread locking insert for use in any application requiring a 5/16-18 internal thread installed into a 1/2-13 tapped bore using a standard tap. No specific equipment model compatibility was provided by the manufacturer for this part.

Installation Notes

Installation is performed by threading the insert into a 1/2-13 tapped hole using the appropriate installation tool. Always ensure the parent material bore is clean and properly tapped to 1/2-13 UNC before installation. Power down or de-energize any equipment before performing thread repair or insert installation in live assemblies. Follow applicable industry fastener standards and consult the manufacturer installation guide for tool selection and proper seating procedure.