E-z Lok 329-8IC Thread Locking Insert Thread Repair

Product Description

The E-Z LOK 329-8IC is a carbon steel thread locking insert designed for thread repair in stripped or damaged threaded holes. It accepts a 1/2-13 internal thread and installs into a 3/4-10 tapped hole, providing a secure, load-bearing thread repair without the need for specialty inserts or adhesives. The insert measures 21/32 inches in overall length and is manufactured from C12L14 carbon steel with a smooth, rolled finish. It is compatible with standard tap types, making it straightforward to install in most shop or field repair scenarios. Licensed tradespeople and maintenance machinists are the typical installers.

This insert is suited for thread repair applications in mechanical assemblies, structural fastener locations, and equipment maintenance situations where the parent material thread has been damaged or stripped. The 1/2-13 internal thread is a common UNC fastener size, and the 3/4-10 external thread provides solid engagement in the host material. Typical applications include repairs to cast iron, aluminum, or steel housings and brackets found in HVAC equipment, pumps, and mechanical systems. The smooth, rolled finish supports installation torque transfer and consistent seating.

Key Features

• 1/2-13 UNC internal thread with a 2B class of fit for standard fastener acceptance
• 3/4-10 external thread with a 2A class of fit for reliable host-material engagement
• 21/32 inches overall length for shallow-to-moderate thread repair depth
• C12L14 carbon steel construction for strength and machinability
• Smooth, rolled finish compatible with standard tap types
• Thread repair insert type - restores original thread spec without oversized fasteners

Compatibility

Designed as an OEM-style thread repair insert for use in any standard tapped hole requiring a 3/4-10 external thread and a 1/2-13 internal thread, installed with a standard tap.

Installation Notes

Installation is typically performed by a machinist or qualified maintenance technician. The host material must be drilled and tapped to a 3/4-10 thread specification using a standard tap before the insert is driven in. Power down or de-energize any equipment before accessing threaded fastener locations in live systems. Follow applicable mechanical and equipment service codes when performing thread repairs on pressurized or load-bearing assemblies.