Jergens 215-066106 Keylocking Thread Insert 1/2-20 Unf

Product Description

The JERGENS 215-066106 is a heavy-duty keylocking thread locking insert designed to create a permanent, load-bearing internal thread in parent materials that require a reliable threaded anchor. Manufactured from C1215 carbon steel with a zinc phosphate coating, this insert features a 1/2-20 UNF internal thread and a 3/4-16 UNF external thread. The overall length is 5/8 inches (0.620 inches decimal). It meets NAS 1394 standards and is built for high-stress fastening applications where thread pullout resistance is critical. Licensed machinists, maintenance technicians, and assembly professionals install this type of insert.

This insert is suited for use in metalworking, industrial assembly, and maintenance-repair-overhaul (MRO) applications where a strong, vibration-resistant threaded connection is needed in a pre-bored hole. The external 3/4-16 thread engages the parent material bore, while the internal 1/2-20 thread accepts the mating fastener. Applications include aerospace ground support equipment, tooling fixtures, and heavy industrial assemblies where NAS 1394 compliance is specified. The zinc phosphate finish provides baseline corrosion resistance for indoor and controlled-environment use.

Key Features

• Heavy-duty keylocking design resists rotation and pullout under high axial and torque loads
• 1/2-20 UNF internal thread with Class 2B fit for standard fastener engagement
• 3/4-16 UNF external thread with Class 2A fit for precise bore installation
• C1215 carbon steel construction meets NAS 1394 standard
• Zinc phosphate coating provides corrosion resistance in controlled environments
• 5/8-inch overall length suits compact installation envelopes

Compatibility

Designed as a direct-installation keylocking insert for parent material bores tapped to 3/4-16 UNF, accepting 1/2-20 UNF fasteners. Conforms to NAS 1394 for applications requiring that standard.

Installation Notes

Installation of keylocking thread inserts requires a properly sized and tapped parent bore at 3/4-16 UNF prior to insert installation. Use the appropriate keylocking insert installation tool to drive and lock the keys into the parent material. Ensure the parent material is secured and the work area is clear of cutting fluids that could affect key locking. Follow shop safety procedures and applicable fastener installation standards for the assembly being serviced.