Jergens 215-066303 Keylocking Thread Insert 5/16-18 Unc

Product Description

The JERGENS 215-066303 is a heavy-duty keylocking thread locking insert designed to provide a permanent, load-bearing threaded hole in parent materials that require reliable fastener retention. The insert accepts a 5/16-18 internal thread and installs via a 1/2-13 external thread, with an overall length of 0.43 inches. Manufactured from 303 stainless steel with a passivated finish, it resists corrosion and meets NAS 1394 standards. This insert is installed by licensed machinists, tooling technicians, and MRO professionals working in precision assembly environments where thread integrity under cyclic or high-load conditions is critical.

This keylocking insert is suited for use in metalworking and precision fastener applications where the parent material thread must be reinforced or repaired. The UNC thread standard makes it a common fit for North American equipment assemblies. The heavy-duty keylocking design uses a mechanical locking feature to prevent rotation and pullout, making it appropriate for both original equipment manufacturing and field repair scenarios. It is typically installed in machined bores in metal components across aerospace, industrial, and mechanical assembly applications.

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 secure installation into prepared bores
• 303 stainless steel construction with passivated finish for corrosion resistance
• Heavy-duty keylocking design mechanically prevents insert rotation and axial pullout
• Meets NAS 1394 standard for keylocking threaded inserts
• Overall length of 0.43 inches suits compact or thin-section parent material applications

Compatibility

Designed as a UNC keylocking thread insert compatible with machined parent material bores prepared to accept a 1/2-13 external thread for reinforced 5/16-18 internal thread applications.

Installation Notes

Installation is performed by machinists or skilled assembly technicians using the appropriate keylocking insert driver tool specified for this insert series. The parent material bore must be machined to the correct diameter and thread form for the 1/2-13 external thread before installation. Ensure all power is removed from any assembly before threading or driving the insert. Keys are driven flush after installation to lock the insert in place and should not be removed once set.