E-z Lok BDC690604 Thread Locking Insert 1/4-20 Unc

Product Description

The E-Z LOK BDC690604 is a carbon steel thread locking insert designed for thread repair applications. It installs into a host material with a 7/16-14 external thread and provides a fresh 1/4-20 internal thread for the mating fastener. Overall length is 0.437 inches. The insert follows UNC thread standards and comes with a bright, uncoated finish. It is used when a threaded hole has been stripped, cross-threaded, or otherwise damaged and needs to be restored to full holding strength without replacing the entire component. Machinists, maintenance technicians, and field service professionals install this type of insert as a reliable repair solution in metal and other host materials.

This insert fits thread repair scenarios in residential and light commercial maintenance, manufacturing, and equipment service environments. It is suited for applications where the original 1/4-20 tapped hole has failed and a permanent, load-bearing repair is needed. The 7/16-14 external thread drives into the reworked or re-tapped hole to lock in place and restore the original thread specification. Common use cases include repair of stripped holes in housings, brackets, frames, and mechanical assemblies where disassembly or part replacement is not practical.

Key Features

• 1/4-20 internal thread restores stripped or damaged UNC tapped holes to original specification
• 7/16-14 external thread provides secure locking engagement in re-tapped host material
• 0.437 inch overall length for compact installation in thin or limited-depth applications
• Carbon steel construction for solid holding strength in metal-to-metal repair applications
• Bright uncoated finish allows easy visual inspection after installation
• UNC thread standard ensures compatibility with standard inch-series fasteners

Compatibility

Designed as an OEM-style thread repair insert for any application requiring restoration of a 1/4-20 UNC internal thread using a 7/16-14 external drive thread.

Installation Notes

Installation is typically performed by a machinist or experienced maintenance technician. The damaged hole must be re-tapped to the 7/16-14 thread specification before the insert is driven in. Power down or de-energize any equipment before accessing the fastener location. Follow the insert manufacturer's installation instructions for correct drive tool use and engagement depth to avoid damaging the insert or host material.