E-z Lok 329-5IC Thread Locking Insert 5/16-18 X 1/2-13

Product Description

The E-Z LOK 329-5IC is a carbon steel thread locking insert designed for thread repair in stripped or damaged parent material. It features a 5/16-18 internal thread with a 2B class of fit and a 1/2-13 external thread with a 2A class of fit. Overall installed length is 31/64 inches (0.484 inches). The insert is manufactured from C12L14 carbon steel with a smooth, rolled finish. Licensed HVAC, plumbing, and mechanical technicians use these inserts to restore load-bearing thread integrity without replacing the host component.

This insert is suited for thread repair applications where the parent bore has been stripped to a 1/2-13 thread and the required fastener interface is 5/16-18. Compatible with standard tap type preparation. Typical use cases include equipment housings, brackets, and structural hardware in residential and light commercial mechanical systems where maintaining original fastener size is critical to reassembly.

Key Features

• 5/16-18 internal thread (Class 2B) restores original fastener interface
• 1/2-13 external thread (Class 2A) installs into a standard tapped repair bore
• C12L14 carbon steel construction for reliable strength in ferrous applications
• 31/64 inch overall length fits compact or shallow bore conditions
• Smooth, rolled finish for consistent thread engagement and installation torque
• Compatible with standard tap type - no specialty tooling required

Compatibility

Designed as an OEM-style thread repair insert for applications requiring a 5/16-18 internal thread restored within a 1/2-13 tapped bore using a standard tap preparation.

Installation Notes

Installation is typically performed by a qualified mechanical or service technician. The parent material must be drilled and tapped to 1/2-13 using a standard tap before the insert is driven in. De-energize and isolate the equipment before performing any thread repair work on live mechanical assemblies. Follow the insert manufacturer's installation instructions and applicable mechanical codes for fastener torque and joint integrity requirements.