E-z Lok 329-1216 Thread Locking Insert 3/4-16 Unf

Product Description

The E-Z LOK 329-1216 is a self-lock wall thread locking insert designed to create a secure, vibration-resistant threaded connection in existing parent material. This insert accepts a 3/4-16 UNF internal thread and installs via a 1-8 external thread, making it suitable for applications where a standard tapped hole needs to be reinforced or converted to a finer thread pitch. Manufactured from C12L14 carbon steel with a smooth, rolled finish, the 329-1216 measures 25/32 inches (0.781 inches) in overall length. Licensed HVAC, mechanical, and industrial maintenance technicians install these inserts to restore stripped threads or add thread-locking functionality to assemblies subject to movement or torque load.

This insert is appropriate for use in metalworking, mechanical assembly, and maintenance repair operations where UNF thread standards are required. The self-lock wall design provides resistance to loosening under vibration or dynamic loading without requiring adhesive thread-locking compounds. It is suited for both light industrial and field repair scenarios where a standard tap is used for installation preparation. The 2B internal and 2A external class of fit ratings indicate general-purpose tolerances consistent with standard UNF fastener practice.

Key Features

• 3/4-16 UNF internal thread with 2B class of fit for standard fastener compatibility
• 1-8 external thread with 2A class of fit for installation into a standard tapped parent hole
• Self-lock wall design resists loosening under vibration without adhesive compounds
• C12L14 carbon steel construction provides consistent machinability and thread integrity
• Smooth, rolled finish on external thread promotes clean installation
• Overall length of 25/32 inches (0.781 inches) suits compact joint configurations

Compatibility

Designed as an OEM-style thread repair and conversion insert for applications requiring a UNF 3/4-16 internal thread installed through a standard-tapped 1-8 parent hole in carbon steel or compatible base materials.

Installation Notes

Installation is performed by a qualified machinist or mechanical technician using a standard tap sized for the 1-8 external thread prior to driving the insert. The parent material assembly should be fully de-energized and secured before thread repair work begins. Do not exceed the engagement depth supported by the insert length, and avoid cross-threading during installation. Follow applicable fastener and mechanical assembly standards for the specific application environment.