E-z Lok 303-10 Thread Locking Insert 5/8-11 Unc

Product Description

The E-Z LOK 303-10 is a self-locking threaded insert machined from 303-grade stainless steel, designed to create a secure, vibration-resistant internal thread in parent materials that require a larger external thread engagement. The insert features a 5/8-11 UNC internal thread and a 7/8-9 UNC external thread, with an overall length of 11/16 inches (0.687 inches decimal). The self-lock wall design grips the host material under torque load, reducing the risk of back-out during service. Tensile strength is rated at 37,921 pounds. Installation is suited for machinists, maintenance technicians, and industrial tradespeople working in metal fabrication or equipment repair applications.

This insert is used in applications where a strong, corrosion-resistant threaded repair or thread conversion is needed in metal components. The 303 stainless steel construction makes it suitable for environments where mild corrosion resistance is required. It accepts a standard tap drill and is installed with a driving tool into a pre-tapped hole. Typical use cases include industrial equipment housings, structural fixtures, and mechanical assemblies requiring reliable UNC thread engagement in a larger bore.

Key Features

• 5/8-11 UNC internal thread with Class 2B fit for standard fastener engagement
• 7/8-9 UNC external thread with Class 2A fit for host material installation
• Self-lock wall design resists vibration-induced back-out
• 303 stainless steel construction provides corrosion resistance and machinability
• Bright finish with no coating buildup on thread surfaces
• Tensile strength rated at 37,921 pounds for demanding load applications

Compatibility

Designed as a replacement or new-installation threaded insert for applications requiring a 5/8-11 UNC internal thread within a 7/8-9 UNC tapped bore. Compatible with standard tap drill preparation for 7/8-9 UNC threads.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using the appropriate E-Z LOK driving tool. The parent material must be pre-tapped to accept a 7/8-9 UNC external thread before the insert is driven in. Ensure the host material is secured and free of chips or debris before installation. Do not exceed the rated tensile load of the insert or the parent material during assembly.