Jergens 215-065904 Thread Locking Insert 3/8-16 Unc

Product Description

The JERGENS 215-065904 is a heavy-duty keylocking thread locking insert designed to provide a permanent, high-strength internal thread in metal assemblies. It accepts a 3/8-16 UNC internal thread and installs via a 9/16-12 UNC external thread, with an overall length of 0.5 inches. Manufactured from C1215 carbon steel with a zinc phosphate coating, this insert is built for demanding fastening applications where thread pullout resistance is critical. It meets NAS 1394 standards and is suited for use in production environments requiring reliable thread repair or thread reinforcement in parent material.

This insert is used in industrial, aerospace, and mechanical assembly applications where high-load threaded connections must be secured against rotation or pullout. The heavy-duty keylocking design makes it appropriate for use in aluminum, cast iron, or softer parent materials that cannot reliably hold standard threads under dynamic or high-torque loading. Machinists, assembly technicians, and maintenance mechanics typically install these inserts during fabrication or repair operations.

Key Features

• Heavy-duty keylocking design resists rotation and pullout under high-load conditions
• 3/8-16 UNC internal thread with Class 2B fit for standard fastener compatibility
• 9/16-12 UNC external thread with Class 2A fit for precise installation
• C1215 carbon steel construction with zinc phosphate coating for corrosion resistance
• Meets NAS 1394 standards for aerospace and industrial thread insert applications
• Compact 0.5-inch overall length suits thin-section and space-constrained assemblies

Compatibility

Designed as an OEM-style keylocking thread insert replacement for industrial and mechanical assemblies requiring a 3/8-16 UNC internal thread in a 9/16-12 UNC tapped hole.

Installation Notes

Installation requires drilling and tapping the parent material to the specified 9/16-12 UNC external thread dimension before driving the insert. Use the appropriate keylocking insert installation tool to seat the insert flush and drive the locking keys. Power down all equipment and secure the workpiece before beginning thread preparation. Follow applicable shop safety and torque procedures as specified by the assembly engineer or equipment manufacturer.