E-z Lok 450-8 Thread Locking Insert M8 X 1.25 Metric

Product Description

The E-Z LOK 450-8 is a self-locking threaded insert designed to create a secure, permanent internal thread in materials that cannot reliably hold a fastener on their own. The insert accepts an M8 x 1.25 internal thread and installs via an M12 x 1.75 external thread, following the Metric Coarse thread standard. Made from C12L14 carbon steel with a smooth, rolled finish, it delivers a tensile strength of 10,447 pounds. Overall length is 12.5 mm. Licensed HVAC, plumbing, and mechanical contractors use this type of insert when repairing stripped bores or building reliable thread engagement into soft or thin base materials.

This insert is suited for applications requiring a fixed, load-bearing internal thread in metal assemblies. The self-lock wall design resists rotation and pull-out once installed, making it appropriate for equipment housings, structural brackets, and mechanical assemblies where thread failure is not acceptable. It installs using a standard tap, with no special tooling required beyond what is already common in a trade shop. The 6H internal thread class of fit and 6G external thread class of fit meet standard metric tolerance requirements for general mechanical use.

Key Features

• M8 x 1.25 internal thread with 6H class of fit for precise metric fastener engagement
• M12 x 1.75 external thread with 6G class of fit for consistent installation torque
• Self-lock wall design resists rotation and pull-out after installation
• C12L14 carbon steel construction with smooth, rolled finish
• Tensile strength rated at 10,447 pounds for high-load applications
• Compatible with standard tap installation - no proprietary tooling required

Compatibility

Designed as an OEM-style replacement or repair insert for metric threaded assemblies requiring an M8 x 1.25 internal thread installed via an M12 x 1.75 external thread in carbon steel or compatible base materials.

Installation Notes

Installation is performed by machinists and mechanical trade technicians using a standard M12 x 1.75 tap to prepare the receiving bore. Ensure the base material is clean, free of debris, and properly supported before driving the insert. De-energize and isolate any equipment before accessing threaded assemblies on live systems. Follow applicable mechanical and structural codes for the equipment being serviced.