Jergens 215-065910 Keylocking Thread Insert 7/8-9 Unc

Product Description

The JERGENS 215-065910 is a heavy-duty keylocking thread locking insert designed to create permanent, high-strength threaded connections in parent materials that may not support reliable thread engagement on their own. It features a 7/8-9 UNC internal thread and a 1-1/4-12 external thread, with an overall length of 1.25 inches. Manufactured from C1215 carbon steel with a zinc phosphate coating for corrosion resistance, this insert meets NAS 1394 standards and is suited for applications where vibration or high load could compromise standard threaded fasteners.

This insert is used in industrial and mechanical assembly applications where a durable, locked thread is required in a base material. The keylocking design mechanically locks the insert into the parent material, preventing rotation under load. It is appropriate for use in machined housings, tooling fixtures, and structural assemblies across aerospace, heavy equipment, and general manufacturing environments. Internal thread class of fit is 2B and external thread class of fit is 2A, conforming to standard UNC tolerances.

Key Features

• Heavy-duty keylocking design resists rotation and pullout under high-load and vibration conditions
• 7/8-9 UNC internal thread with 2B class of fit for standard fastener compatibility
• 1-1/4-12 external thread with 2A class of fit for precise installation into parent material
• C1215 carbon steel construction with zinc phosphate coating for strength and corrosion resistance
• Meets NAS 1394 standards for keylocking insert performance
• 1.25-inch overall length suits moderate-depth thread engagement applications

Compatibility

Designed as an OEM-style keylocking thread insert for use in parent materials tapped to a 1-1/4-12 thread, compatible with 7/8-9 UNC fasteners meeting 2B internal thread class of fit requirements.

Installation Notes

Installation is typically performed by a machinist or maintenance technician using a keylocking insert installation tool to drive the locking keys into the parent material after the insert is threaded into place. Ensure the parent material bore is tapped to the correct 1-1/4-12 thread specification before installation. Do not reuse an insert once the locking keys have been driven, as this compromises the locking mechanism. Follow NAS 1394 installation procedures and applicable facility safety guidelines when working with threaded fasteners under load.