E-z Lok 453-4 Thread Locking Insert M4x0.7 M8x1.25 Ss

Product Description

The E-Z LOK 453-4 is a self-locking threaded insert designed to create a strong, permanent internal thread in materials that cannot reliably hold a fastener on their own. It accepts an M4 x 0.70 internal thread and installs via an M8 x 1.25 external thread, following the Metric Coarse thread standard. The insert is manufactured from 303 stainless steel with a bright finish, providing corrosion resistance in demanding environments. At 7.5 mm overall length and a tensile strength rated at 2,469 pounds, it delivers reliable holding power in compact installations. This part is installed by machinists, maintenance technicians, and assembly professionals working with metal or composite substrates.

The 453-4 is suited for applications requiring a locked, vibration-resistant threaded connection in thin-walled or soft parent materials. The self-lock wall design engages the host material during installation to resist rotation and pull-out without relying on adhesives. Typical use cases include machinery repair, equipment assembly, and precision fabrication where metric fastener compatibility is required and thread stripping is a concern. Installation uses a standard tap for the M8 x 1.25 hole preparation, keeping tooling requirements straightforward.

Key Features

• Self-lock wall design resists rotation and pull-out without adhesives
• M4 x 0.70 internal thread with 6H class of fit for precise fastener engagement
• M8 x 1.25 external thread with 6G class of fit for consistent installation
• 303 stainless steel construction with bright finish for corrosion resistance
• 2,469-pound tensile strength in a 7.5 mm overall length
• Compatible with standard tap installation - no special tooling required

Compatibility

Designed for use in applications requiring a Metric Coarse M4 x 0.70 internal thread installed via a standard M8 x 1.25 tapped hole in metal or composite parent materials.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard tap to prepare the M8 x 1.25 receiving hole before driving the insert. Ensure the parent material is securely fixtured and the tapped hole is clean and free of debris prior to installation. De-energize or lock out any equipment being serviced before working on threaded connections in live assemblies. Follow applicable industry standards for fastener installation torque based on the parent material and fastener grade in use.