E-z Lok 329-820 Thread Locking Insert 1/2-20 3/4-10 Unf

Product Description

The E-Z LOK 329-820 is a self-locking threaded insert designed to create a secure, vibration-resistant internal thread in metal assemblies. It features a 1/2-20 UNF internal thread and a 3/4-10 external thread, with an overall length of 21/32 inches (0.656 inches). Manufactured from C12L14 carbon steel with a smooth, rolled finish, this insert is suited for applications where thread integrity under load and vibration is critical. Licensed trades and mechanical assemblers install these inserts to repair stripped threads or to establish a stronger threaded connection in base materials that cannot hold a fastener on their own.

This insert is used in metal fabrication, maintenance and repair operations, and original equipment manufacturing where a reliable UNF internal thread is required. The self-lock wall design resists loosening without the need for thread-locking compounds. It installs using a standard tap and is appropriate for residential and commercial mechanical assemblies, equipment frames, and structural hardware applications. The external 3/4-10 thread engages the host material while the 1/2-20 internal thread accepts the mating fastener.

Key Features

• 1/2-20 UNF internal thread with Class 2B fit for standard fastener compatibility
• 3/4-10 external thread with Class 2A fit for secure engagement in host material
• Self-lock wall design resists loosening under vibration without adhesives
• C12L14 carbon steel construction for strength and machinability
• 21/32 inch overall length suits typical metal panel and structural applications
• Smooth, rolled finish for consistent installation with a standard tap

Compatibility

Designed as an OEM-style replacement or new-installation threaded insert for metal assemblies requiring a 1/2-20 UNF internal thread installed via a standard 3/4-10 tap.

Installation Notes

Installation requires drilling and tapping the host material to accept the 3/4-10 external thread before driving the insert. Ensure the host material is properly secured and the work area is de-energized or depressurized as applicable before beginning any thread repair or insert installation. Use the correct tap type as specified - a standard tap is required for this insert. Follow applicable mechanical codes and the fastener manufacturer guidelines for torque and installation procedure.