Jergens 215-066102 Keylocking Thread Insert 1/4-28 Unf

Product Description

The JERGENS 215-066102 is a heavy-duty keylocking thread locking insert designed to provide permanent, vibration-resistant thread reinforcement in metal assemblies. Manufactured from C1215 carbon steel with a zinc phosphate coating, this insert features a 1/4-28 UNF internal thread and a 7/16-14 UNF external thread. The overall length is 0.37 inches. Keylocking inserts are driven into a pre-tapped hole where locking keys are then staked into the parent material, preventing rotation under load or vibration. This insert meets NAS 1394 standards and is installed by maintenance technicians, machinists, and assembly professionals working in aerospace, industrial, and high-vibration mechanical applications.

This insert is suited for use in metal parent materials where thread stripping or pull-out is a concern. The heavy-duty keylocking design handles higher torque loads than standard helical inserts, making it appropriate for structural fastening applications in aluminum, steel, and cast assemblies. The zinc phosphate finish provides moderate corrosion resistance and improves adhesion in coated assemblies. Typical installation scenarios include repair of stripped threads and original-equipment thread reinforcement in precision machined components.

Key Features

• Heavy-duty keylocking design locks insert permanently into parent material via staked keys
• 1/4-28 UNF internal thread with 2B class of fit for standard fastener engagement
• 7/16-14 UNF external thread with 2A class of fit for precise installation torque
• C1215 carbon steel construction for high tensile strength in demanding assemblies
• Zinc phosphate coating provides corrosion resistance and surface adhesion
• Compliant with NAS 1394 standards for aerospace and industrial use

Compatibility

Designed as an OEM-style replacement or original installation component for metal assemblies requiring a 1/4-28 UNF internal thread reinforcement with a 7/16-14 UNF external installation thread.

Installation Notes

Installation requires a pre-tapped 7/16-14 hole in the parent material and a dedicated keylocking insert installation tool for driving and staking the locking keys. Ensure the parent material is secured and free of chips or debris before installation. Once keys are staked, the insert is not intended to be removed without damaging the parent material. This work is typically performed by machinists or qualified assembly technicians following applicable torque and thread engagement specifications for the application.