Jergens 215-066302 Keylocking Thread Insert 1/4-20 Unc

Product Description

The JERGENS 215-066302 is a heavy-duty keylocking thread locking insert designed to install a permanent, vibration-resistant threaded hole in metal parent materials. The insert features a 1/4-20 internal thread and a 7/16-14 external thread, both UNC standard, with an overall length of 0.37 inches. Manufactured from 303 stainless steel with a passivated finish, it resists corrosion and meets NAS 1394 requirements. Machinists, tool and die technicians, and maintenance professionals install these inserts where stripped or weak threads need a durable, locking repair or new threaded anchor point.

This insert is suited for use in aerospace, defense, industrial machinery, and heavy equipment applications where thread retention under vibration or dynamic loading is critical. The keylocking design uses keys that are driven into the parent material to lock the insert in place, preventing rotation during torque application. At 0.37 inches in length, this insert fits into relatively thin parent material sections while still providing reliable thread engagement for 1/4-20 fasteners.

Key Features

• Heavy-duty keylocking design resists rotation and pullout under vibration and high torque
• 1/4-20 internal thread (Class 2B fit) for standard UNC fasteners
• 7/16-14 external thread (Class 2A fit) for positive engagement in parent material
• 303 stainless steel construction with passivated finish for corrosion resistance
• Meets NAS 1394 standards for aerospace and industrial applications
• Compact 0.37 inch overall length for use in space-constrained assemblies

Compatibility

Designed as an OEM-style keylocking insert for parent materials drilled and tapped to accept a 7/16-14 external thread, providing a permanent 1/4-20 internal thread. Consult the NAS 1394 standard and JERGENS installation tooling specifications to confirm parent material requirements and proper installation tooling selection.

Installation Notes

Installation requires a properly sized installation tool to drive the locking keys into the parent material after the insert is threaded into the pre-tapped hole. Power down and de-energize any equipment before performing thread repair or insert installation in live assemblies. Follow NAS 1394 guidelines for hole preparation, insert installation torque, and key staking procedure. A licensed machinist or qualified maintenance technician should perform installation to ensure proper seating and key engagement.