E-z Lok 303-5 Thread Locking Insert 5/16-18 Unc Stainless

Product Description

The E-Z LOK 303-5 is a self-lock wall thread locking insert designed to create a secure threaded connection in materials that require reinforced or repaired threads. Machined from grade 303 stainless steel with a bright finish, it accepts a 5/16-18 internal thread and installs via a 1/2-13 external thread into a tapped host material. The overall length is 31/64 inches (0.484 inches). With a tensile strength rated at 10,185 pounds, it is built for applications where thread pullout resistance is critical. Installers in mechanical, structural, and maintenance trades use this insert to establish reliable fastener engagement in metal assemblies.

This insert is suited for use in metal fabrication, machinery repair, and industrial maintenance applications where a standard UNC thread pattern is required. It installs into a host material tapped to a 1/2-13 thread using standard tooling, then receives a 5/16-18 fastener. The self-lock wall design provides resistance to vibration loosening without the need for additional thread-locking compounds. It is appropriate for both new assembly work and field repair of damaged or stripped threads.

Key Features

• 5/16-18 internal thread with 2B class of fit for standard UNC fastener engagement
• 1/2-13 external thread with 2A class of fit for installation into standard tapped hole
• Self-lock wall design resists vibration loosening without adhesives
• Grade 303 stainless steel construction with bright finish for corrosion resistance
• Tensile strength of 10,185 pounds for high-load fastening applications
• Overall length of 31/64 inches (0.484 inches) for precise dimensional fit

Compatibility

Designed as an OEM-style replacement or new-installation thread locking insert for applications using UNC 5/16-18 internal and 1/2-13 external thread standards. Compatible with standard taps for the 1/2-13 thread size.

Installation Notes

Installation is typically performed by machinists, maintenance technicians, or mechanical contractors using standard hand or machine tapping tools. Before installation, ensure the host material is tapped to the correct 1/2-13 thread specification and the bore is free of debris. Drive the insert to the required depth using the appropriate installation tool for self-lock wall inserts. Consult applicable industry standards for torque and thread engagement requirements specific to the host material and load application.